GOLDEN STAR RESOURCES LTD., 40-F filed on 3/25/2021
Annual Report (foreign private issuer)
v3.21.1
Cover Page
12 Months Ended
Dec. 31, 2020
shares
Entity Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2020
Entity File Number 001-12284
Entity Registrant Name GOLDEN STAR RESOURCES LTD.
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 333 Bay Street, Suite 2400
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Postal Zip Code M5H 2T6
Entity Address, Country CA
City Area Code 416
Local Phone Number 583-3800
Title of 12(b) Security Common Stock, no par value
Trading Symbol GSS
Security Exchange Name NYSEAMER
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 111,313,595
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Entity Central Index Key 0000903571
Amendment Flag false
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One 10 East 40th Street, 10th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10016
City Area Code 800
Local Phone Number 221-0102
Contact Personnel Name Cogency Global Inc.
v3.21.1
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Profit or loss [abstract]    
Revenue $ 272,481 $ 203,820 [1],[2]
Cost of sales excluding depreciation and amortization 124,422 110,123 [1],[2]
Depreciation and amortization 23,727 17,134 [1],[2]
Mine operating profit 124,332 76,563 [1],[2]
Other expenses/(income)    
Exploration expense 2,682 3,194 [1],[2]
General and administrative overheads 18,718 14,679 [1],[2]
Share-based compensation expense 2,995 3,119 [1],[2]
Other expense, net 4,849 11,887 [1],[2]
(Gain)/loss on fair value of derivative financial instruments, net (794) 1,642 [1],[2]
Income before finance and tax 95,882 42,042 [1],[2]
Finance expense, net 9,463 4,615 [1],[2]
Income from continuing operations before tax 86,419 37,427 [1],[2]
Income tax expense 48,266 27,439 [1],[2],[3]
Net income and comprehensive income from continuing operations 38,153 9,988 [1],[2],[3]
Net loss and comprehensive loss from discontinued operations (56,434) (87,962) [1],[2]
Comprehensive loss (18,281) (77,974)
Net (loss)/income and comprehensive (loss)/income (18,281) (77,974) [1],[2]
Comprehensive income/loss attributable to non-controlling interest 33,859 (10,540)
Net (loss)/income and comprehensive (loss)/income from continuing operations attributable to non-controlling interest (365) 4,671
Comprehensive loss attributable to Golden Star shareholders (52,140) (67,434)
Net (loss)/income and comprehensive (loss)/income from continuing operations attributable to Golden Star shareholders $ 38,518 $ 5,317
Net income/loss per share attributable to owners and to non-controlling interests from continuing and discontinued operations [abstract]    
Net income from continuing operations per share attributable to Golden Star shareholders, basic (USD per share) $ 0.35 $ 0.05 [1],[2]
Net income from continuing operations per share attributable to Golden Star shareholders, diluted (USD per share) 0.34 0.05 [1],[2]
Basic income/(loss) per share from discontinued operations USD per share) (0.82) (0.67)
Diluted income/(loss) per share from discontinued operations, diluted (USD per share) (0.82) (0.67)
Net loss per share attributable to Golden Star shareholders, basic (USD per share) (0.47) (0.62) [1],[2]
Net loss per share attributable to Golden Star shareholders, diluted (USD per share) $ (0.47) $ (0.62) [1],[2]
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
[1]
CURRENT ASSETS    
Cash and cash equivalents $ 60,809 $ 53,367 [2]
Accounts and other receivables 23,759 6,503
Inventories 30,600 38,860
Prepaids and other 6,548 7,107
Total Current Assets 121,716 105,837
RESTRICTED CASH 2,131 2,082
ACCOUNTS AND OTHER RECEIVABLES 12,602 0
MINING INTERESTS 207,412 264,689
Total assets 343,861 372,608
CURRENT LIABILITIES    
Accounts payable and accrued liabilities 41,297 88,368
Current portion of rehabilitation provisions 2,018 5,826
Current portion of deferred revenue 7,646 11,191
Current portion of long-term debt 50,031 15,987
Current portion of derivative liability 3,312 211
Current income tax liabilities 12,774 811
Current liabilities 117,078 122,394
REHABILITATION PROVISIONS 15,550 62,609
DEFERRED REVENUE 96,916 102,784
LONG TERM DEBT 55,732 90,782
DERIVATIVE LIABILITY 1,713 5,608
DEFERRED TAX LIABILITY 31,098 20,554
Total Liabilities 318,087 404,731
SHAREHOLDERS’ EQUITY    
CONTRIBUTED SURPLUS 38,769 38,964
DEFICIT (950,919) (898,779)
Shareholders’ equity attributable to Golden Star shareholders 5,863 50,390
NON-CONTROLLING INTEREST 19,911 (82,513)
Total Equity 25,774 (32,123)
Total Liabilities and Shareholders’ Equity 343,861 372,608
First preferred shares    
SHAREHOLDERS’ EQUITY    
SHARE CAPITAL 0 0
Common shares    
SHAREHOLDERS’ EQUITY    
SHARE CAPITAL $ 918,013 $ 910,205
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
CONSOLIDATED BALANCE SHEETS (Parenthetical) - First preferred shares - shares
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]    
Number of shares outstanding (shares) 0 0
Number of shares issued (shares) 0 0
v3.21.1
CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES:    
Net income from continuing operations $ 38,153 $ 9,988 [1],[2],[3]
Reconciliation of net income to net cash provided by operating activities:    
Depreciation and amortization 24,241 17,511 [2]
Share-based compensation expense 2,995 3,119 [2]
Income tax expense 48,266 27,439 [1],[2],[3]
(Gain)/loss on fair value of derivative financial instruments, net (794) 1,642 [2]
Deferred revenue recognized (8,662) (10,220) [2]
Reclamation expenditures (1,233) (1,202) [2]
Other non-cash items 10,506 10,253 [2]
Total changes in working capital and taxes paid (29,468) (8,409) [2]
Net cash provided by operating activities of continuing operations 84,004 50,121 [2]
Net cash used in operating activities of discontinued operations (23,915) (27,280) [2]
Net cash provided by operating activities 60,089 22,841 [2]
INVESTING ACTIVITIES:    
Additions to mining interests (45,224) (60,123) [2]
Change in accounts payable and deposits on mine equipment and material (960) 1,217 [2]
(Increase)/decrease in restricted cash (1,041) 2,418 [2]
Net cash used in investing activities of continuing operations (47,225) (56,488) [2]
Net cash used in investing activities of discontinued operations (7,475) (10,923) [2]
Cash flows used in investing activities (54,700) (67,411) [2]
FINANCING ACTIVITIES:    
Proceeds from debt facilities, net 9,114 57,386 [2]
Principal payments on debt facilities (10,000) (55,784) [2]
Payments of lease liabilities (1,694) (1,416) [2]
Exercise of stock options and DSUs and settlement of PRSUs 4,653 1,269 [2]
Net cash provided by financing activities of continuing operations 2,073 1,455 [2]
Net cash used in financing activities of discontinued operations (20) (25) [2]
Cash flows (used in)/provided by financing activities 2,053 1,430 [2]
Increase/(decrease) in cash and cash equivalents 7,442 (43,140) [2]
Cash and cash equivalents, beginning of period [2] 53,367 [4] 96,507
Cash and cash equivalents, end of period $ 60,809 $ 53,367 [2],[4]
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[4] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
$ in Thousands
USD ($)
shares
Share Capital  
Common shares
USD ($)
shares
Contributed Surplus
USD ($)
Deficit
USD ($)
Non-Controlling Interest
USD ($)
Balance at beginning of period (shares) at Dec. 31, 2018 | shares   108,819,009      
Balance at beginning of period at Dec. 31, 2018 $ 41,975 $ 908,035 $ 37,258 $ (831,345) $ (71,973)
Shares issued under options (shares) | shares 438,000 437,772      
Shares issued under options $ 1,270 $ 2,054 (784)    
Shares issued under PRSUs (shares) | shares   128,282      
Shares issued under PRSUs (565) $ 116 (681)    
Options granted, net of forfeitures 1,890   1,890    
Deferred share units granted 689   689    
Performance and restricted share units granted 592   592    
Net (loss)/income (77,974) [1],[2]     (67,434) (10,540)
Balance at end of period (shares) at Dec. 31, 2019 | shares   109,385,063      
Balance at end of period at Dec. 31, 2019 (32,123) [3] $ 910,205 38,964 (898,779) (82,513)
Shares issued under DSUs (shares) | shares   135,557      
Shares issued under DSUs $ (105) $ 176 (281)    
Shares issued under options (shares) | shares 1,712,000 1,711,680      
Shares issued under options $ 4,653 $ 7,376 (2,723)    
Shares issued under PRSUs (shares) | shares   81,295      
Shares issued under PRSUs (40) $ 256 (296)    
Options granted, net of forfeitures 438   438    
Deferred share units granted 663   663    
Performance and restricted share units granted 394   394    
UK performance share units granted 1,610   1,610    
Derecognition following the sale of Prestea (Note 5) 68,565       68,565
Net (loss)/income (18,281)     (52,140) 33,859
Balance at end of period (shares) at Dec. 31, 2020 | shares   111,313,595      
Balance at end of period at Dec. 31, 2020 $ 25,774 $ 918,013 $ 38,769 $ (950,919) $ 19,911
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
NATURE OF OPERATIONS
12 Months Ended
Dec. 31, 2020
Basis Of Consolidation [Abstract]  
NATURE OF OPERATIONS
1. NATURE OF OPERATIONS
Golden Star Resources Ltd. ("Golden Star" or "the Company" or "we" or "our") is an international gold mining and exploration company incorporated under the Canada Business Corporations Act. The Company's shares are listed on the Toronto Stock Exchange under the symbol GSC, the NYSE American exchange (formerly NYSE MKT) under the symbol GSS and the Ghana Stock Exchange under the symbol GSR. The Company's registered office is located at 333 Bay Street, Suite 2400, Toronto, Ontario, M5H 2T6 Canada, and the Company has corporate offices in London, United Kingdom and Accra, Ghana.
Through our 90% owned subsidiary, Golden Star (Wassa) Limited, we own and operate the Wassa underground mine and a carbon-in-leach processing plant (collectively "Wassa"), located northeast of the town of Tarkwa, Ghana. Until September 30, 2020 and as further discussed in Note 5, we owned and operated the Bogoso gold mining and processing operations, the Prestea open pit mining operations and the Prestea underground mine (collectively "Prestea") located near the town of Prestea, Ghana. The Company also holds and manages interests in several gold exploration projects in Ghana.
v3.21.1
BASIS OF PRESENTATION
12 Months Ended
Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]  
BASIS OF PRESENTATION
2. BASIS OF PRESENTATION
Statement of compliance
The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS"), as issued by the International Accounting Standards Board ("IASB") and with interpretations of the International Financial Reporting Interpretations Committee ("IFRIC") which the Canadian Accounting Standards Board has approved for incorporation into Part 1 of the CPA Canada Handbook – Accounting.
These consolidated financial statements were approved by the Company's Board of Directors on February 24, 2021.
Basis of presentation
These consolidated financial statements include the accounts of the Company and its subsidiaries, whether owned directly or indirectly. The financial statements of the subsidiaries are prepared for the same period as the Company using consistent accounting policies for all periods presented, except for the changes in accounting policies described in Note 3.
All inter-company balances and transactions have been eliminated. Subsidiaries are entities controlled by the Company. Non-controlling interests in the net assets of consolidated subsidiaries are a separate component of the Company's equity.
The consolidated financial statements have been prepared on a historical cost basis, except for derivative financial instruments and contingent consideration which are measured at fair value through profit or loss.
Going concern
As at December 31, 2020, the Company had cash and cash equivalents of $60.8 million, net current assets excluding deferred revenue and the embedded derivative liability of $15.6 million and net cash provided by operations before working capital changes for the year then ended of $113.5 million. As at December 31, 2020, the Company was compliant with its debt covenants (refer to Note 25).

To date, the Company has been able to continue operations largely unaffected since the outbreak of the COVID-19 pandemic and gold production and shipments have continued without any significant disruptions. However, the Company cannot provide any assurances that its planned operations, production and capital expenditure for the foreseeable future will not be delayed, postponed or cancelled as a result of the COVID-19 pandemic or otherwise. The COVID-19 pandemic could (i) continue to affect financial markets, including the price of gold and the trading price of the Company’s shares, (ii) adversely affect the Company’s ability to raise capital, and (iii) cause continued interest rate volatility and movements that could make obtaining financing or refinancing debt obligations more challenging or more expensive or unavailable on commercially reasonable terms or at all. Furthermore, the Company may also experience regional risks which include, but are not limited to, a possible shut-down of the gold refining facility in South Africa where the Company delivers its gold production, an inability to ship gold across borders, delays in the supply chain of critical reagents, consumables and parts, and the impact on the delivery of critical capital projects. Any of these events or circumstances could have a material adverse effect on the Company’s business, financial condition and results of operations.
Management has prepared detailed cash flow forecasts to assess the economic impact of COVID-19 from a going concern and viability perspective. Based on these detailed cash flow forecasts, including any reasonably possible changes in the key
assumptions on which the cash flow forecasts are based and assess various scenarios related to COVID-19, Management believes that the Company will have adequate resources to continue as a going concern for the foreseeable future, and at this point in time there are no material uncertainties regarding going concern. Management has concluded that it is appropriate to prepare the consolidated financial statements on a going concern basis.
v3.21.1
SUMMARY OF ACCOUNTING POLICIES
12 Months Ended
Dec. 31, 2020
Significant Accounting Policies [Abstract]  
SUMMARY OF ACCOUNTING POLICIES
3. SUMMARY OF ACCOUNTING POLICIES
Cash and cash equivalents
Cash includes cash deposits in any currency residing in chequing and sweep accounts. Cash equivalents consist of money market funds and other highly liquid investments purchased with maturities of three months or less. Investments with maturities greater than three months and up to one year are classified as short-term investments, while those with maturities in excess of one year are classified as long-term investments. Cash equivalents and short-term investments are stated at amortized cost, which typically approximates market value.
Restricted cash
Cash balances that are subject to legal or contractual obligations are classified separately on the consolidated balance sheets as restricted cash.
Inventories
Inventory classifications include "stockpiled ore," "in-process inventory," "finished goods inventory" and "materials and supplies". The stated value of all production inventories includes direct production costs and attributable overhead and depreciation incurred to bring the materials to their current point in the processing cycle. General and administrative costs for corporate offices are not included in any inventories.
Stockpiled ore represents coarse ore that has been extracted from the mine and is stored for future processing. Stockpiled ore is measured by estimating the number of tonnes (by physical surveys) added to, or removed from the stockpile, the number of contained ounces (based on assay data) and estimated gold recovery percentage. Stockpiled ore value is based on the costs incurred (including depreciation and amortization) in bringing the ore to the stockpile. Costs are added to the stockpiled ore based on current mining costs per tonne and are removed at the average cost per tonne of ore in the stockpile.
In-process inventory represents material that is currently being treated in the processing plants to extract the contained gold and to transform it into a saleable product. The amount of gold in the in-process inventory is determined by assay and by measure of the quantities of the various gold-bearing materials in the recovery process. The in-process gold is valued at the average of the beginning inventory and the cost of material fed into the processing stream plus in-process conversion costs including applicable mine-site overheads, depreciation and amortization related to the processing facilities.
Finished goods inventory is saleable gold in the form of doré bars. Included in the costs are the direct costs of the mining and processing operations as well as direct mine-site overheads, amortization and depreciation.
Materials and supplies inventories consist mostly of equipment parts and other consumables required in the mining and ore processing activities.
All inventories are valued at the lower of average cost or net realizable value.
Property, plant and equipment
Property, plant and equipment assets, including machinery, processing equipment, mining equipment, mine site facilities, buildings, vehicles and expenditures that extend the life of such assets, are initially recorded at cost including acquisition and installation costs. Property, plant and equipment are subsequently measured at cost, less accumulated depreciation and accumulated impairment losses.
The costs of self-constructed assets include direct construction costs and direct overhead costs during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Depreciation for mobile equipment and other assets having estimated lives shorter than the estimated life of the ore reserves is calculated using the straight-line method at rates which depreciate the cost of the assets, less their anticipated residual values, if any, over their estimated useful lives. Mobile mining equipment is amortized over a five-year life. Assets, such as processing plants, power generators and buildings, which have an estimated life equal to or greater than the estimated life of the ore reserves, are amortized over the life of the proven and probable reserves of the associated mining property using a units-of-production amortization method, less their anticipated residual values, if any. The net book value of property, plant and equipment assets is charged against income if the mine site is abandoned and it is determined that the assets cannot be economically transferred to another project or sold.
The residual values, useful lives and method of depreciation of property, plant and equipment are reviewed at each reporting period end and adjusted prospectively, if appropriate.
Gains and losses on the disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount and are recognized net in the consolidated statement of operations.
Mining properties
Mining property assets, including property acquisition costs, tailings storage facilities, mine-site development and drilling costs where proven and probable reserves have previously been established, pre-production waste stripping, condemnation drilling, roads, feasibility studies and wells are recorded at cost. The costs of self-constructed assets include direct construction costs, direct overhead costs and allocated interest during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Mining property assets are amortized over the life of the proven and probable reserves to which they relate, using a units-of-production amortization method. At open pit mines the costs of removing overburden from an ore body in order to expose ore during its initial development period are capitalized.
Underground mine development costs
Underground mine development costs include development costs to build new shafts, drifts and ramps that will enable the Company to physically access ore underground. The time over which the Company will continue to incur these costs depends on the mine life. These underground development costs are capitalized as incurred. Capitalized underground development costs incurred to enable access to specific ore blocks or areas of the underground mine, and which only provide an economic benefit over the period of mining that ore block or area, are depreciated on a units-of-production basis, whereby the denominator is estimated ounces of gold in proven and probable reserves and the portion of resources within that ore block or area that is considered probable of economic extraction. If capitalized underground development costs provide an economic benefit over the entire mine life, the costs are depreciated on a units-of-production basis, whereby the denominator is the estimated ounces of gold in total accessible proven and probable reserves and the portion of resources that is considered probable of economic extraction.
Borrowing costs
Borrowing costs attributable to the acquisition, construction or production of a qualifying asset are capitalized. Qualifying assets are assets that require a significant amount of time to prepare for their intended use, including projects that are in the exploration and evaluation, development or construction stages. Capitalized borrowing costs are considered an element of the cost of the qualifying asset which is determined based on gross expenditures incurred on an asset. Capitalization ceases when the asset is substantially complete or if active development is suspended or ceases. Where the funds used to finance a qualifying asset form part of general borrowings, the amount capitalized is calculated using a weighted average of rates applicable to the relevant borrowings during the period. Where funds borrowed are directly attributable to a qualifying asset, the amount capitalized represents the borrowing costs specific to those borrowings. Other borrowing costs are recognized as an expense in the period in which they are incurred.
Impairment of long-lived assets
The Company assesses at each reporting period whether there is an indication that an asset or group of assets may be impaired. When impairment indicators exist, the Company estimates the recoverable amount of the asset and compares it against the asset's carrying amount. The recoverable amount is the higher of its fair value less cost of disposal ("FVLCD") and the asset's value in use ("VIU"). If the carrying amount exceeds the recoverable amount, an impairment loss is recorded in the consolidated statement of operations.
In assessing VIU, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset not already reflected in the estimates of future cash flows. The cash flows are based on best estimates of expected future cash flows from the continued use of the asset and its eventual disposal.
FVLCD is best evidenced if obtained from an active market or binding sale agreement. Where neither exists, the fair value is based on the best estimates available to reflect the amount that could be received from an arm's length transaction.
Future cash flows are based on estimated quantities of gold and other recoverable metals, expected price of gold (considering current and historical prices, price trends and related factors), production levels and cash costs of production, capital and reclamation costs, all based on detailed engineered life-of-mine plans.
Numerous factors including, but not limited to, unexpected grade changes, gold recovery variances, shortages of equipment and consumables, and equipment failures could impact our ability to achieve forecasted production schedules from proven and probable reserves. Additionally, commodity prices, capital expenditure requirements and reclamation costs could differ from
the assumptions used in the cash flow models used to assess impairment. The ability to achieve the estimated quantities of recoverable minerals from exploration stage mineral interests involves further risks in addition to those factors applicable to mineral interests where proven and probable reserves have been identified, due to the lower level of confidence that the identified mineralized material can ultimately be mined economically.
If an impairment loss reverses in a subsequent period, the carrying amount (post reversal) of the related asset is increased to the revised estimate of recoverable amount to the extent that the increased carrying amount does not exceed the carrying amount that would have been determined had no impairment loss been recognized for the asset previously. Reversals of impairment losses are recognized in the consolidated statement of operations in the period the reversals occur.
Material changes to any of the factors or assumptions discussed above could result in future asset impairments.
Rehabilitation provisions
The Company records a liability and corresponding asset for the present value of the estimated costs of legal and constructive obligations for future site reclamation and closure where the liability is probable, and a reasonable estimate can be made of the obligation. The estimated present value of the obligation is reassessed on a periodic basis or when new material information becomes available. Increases or decreases to the obligation usually arise due to changes in legal or regulatory requirements, the extent of environmental remediation required, methods of reclamation, cost estimates, inflation rates, or discount rates. Changes to the provision for reclamation and remediation obligations related to operating mines, which are not the result of current production of inventory, are recorded with an offsetting change to the related asset. Changes to the provision for reclamation and remediation obligations related to suspended mine operations are recognized in the consolidated statements of operations. The present value is determined based on current market assessments of the time value of money using discount rates based on the risk-free rate maturing approximating the timing of expected expenditures to be incurred and adjusted for country related risks. The periodic unwinding of the discount is recognized in the consolidated statement of operations as a finance expense.
Deferred revenue
Deferred revenue consists of: (i) initial cash payments received by the Company for future delivery of payable gold under the terms of the Company’s Streaming Agreement as defined in Note 18, Deferred Revenue, and (ii) a significant financing component of the Company’s Streaming Agreement. Deferred revenue is increased as interest expense is recognized based on the implicit interest rate of the discounted cash flows arising from the expected delivery of ounces under the Company’s Streaming Agreement.
The amount by which the deferred revenue balance is reduced and recognized into revenue is based on a rate per ounce of gold delivered under the Streaming Agreement. This rate per ounce of gold delivered relating to the payments received by the Company is based on the remaining deferred revenue balance divided by the ounces that are expected to be delivered over the term of the Stream Agreement.
As the Company’s Streaming Agreement contains a variable component, IFRS 15 requires that the transaction price be updated and re-allocated on an ongoing basis. As a result, the deferred revenue recognized per ounce of gold delivered under the Streaming Agreement will require an adjustment each time there is a significant change in the underlying gold production profile of a mine. Should a change in the transaction price be necessary, a cumulative catch-up adjustment to revenue will be made in the period in which the change occurs, to reflect the updated production profile expected to be delivered under the Streaming Agreement.
Foreign currency transactions
The Company's presentation currency of its consolidated financial statements is the U.S. dollar, as is the functional currency of its operations. The functional currency of all consolidated subsidiaries is the U.S. dollar. All values are rounded to the nearest thousand, unless otherwise stated.
Monetary assets and liabilities denominated in foreign currencies are translated into U.S. dollars at period end exchange rates. Non-monetary assets and liabilities denominated in foreign currencies that are measured at fair value are translated into U.S. dollars at the exchange rate at the date that the fair value was determined. Income and expense items are translated at the exchange rate in effect on the date of the transaction. Exchange gains and losses resulting from the translation of these amounts are included in net loss, except those arising on the translation of equity investments at fair value through other comprehensive income that are recorded in other comprehensive income. Non-monetary assets and liabilities denominated in foreign currencies that are measured at historical cost are translated at the exchange rate in effect at the transaction date.
Income taxes
Income taxes comprise the provision for (or recovery of) taxes actually paid or payable (current taxes) and for deferred taxes.
Current taxes are based on taxable earnings in the year. Current tax is calculated using tax rates and laws that were enacted or substantively enacted at the balance sheet date in the respective jurisdictions.
Current income tax assets and current income tax liabilities are only offset if a legally enforceable right exists to offset the amounts and the Company intends to settle on a net basis or to realize the asset and settle the liability simultaneously.
Deferred income tax assets and liabilities are recognized for the expected future tax consequences attributable to temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. Deferred income tax assets and liabilities are computed using enacted or substantially enacted income tax rates in effect when the temporary differences are expected to reverse. The effect on the deferred tax assets and liabilities of a change in tax rates is recognized in the period of substantial enactment. The provision for or the recovery of deferred taxes is based on the changes in deferred tax assets and liabilities during the period.
The carrying amount of deferred income tax assets or liabilities are reviewed at the end of each reporting period and recognized to the extent that it is probable that taxable earnings will be available against which deductible temporary differences can be utilized.
Net income/(loss) per share
Basic income/(loss) per share of common stock is calculated by dividing income available to Golden Star's common shareholders by the weighted average number of common shares issued and outstanding during the period. In periods with earnings, the calculation of diluted net income per common share uses the treasury stock method to compute the dilutive effects of stock options, convertible debentures and other potentially dilutive instruments. In periods of loss, diluted net loss per share is equal to basic loss per share.
Revenue recognition
Revenue from the sale of gold is recognized when the Company transfers control over to a customer. The Company’s spot sales of gold are transported to a gold refiner who locates a buyer and arranges sale of the gold. Effective March 20, 2020, the sale generally completes on the day of arrival of gold at the refinery in South Africa as a consequence of the change in shipment logistics due to the COVID-19 pandemic. Previously, the sale of gold completed on the same day the gold was shipped from the mine site. The sales price is generally set with reference to the London A.M. or P.M. fix on the day of arrival of gold at the refinery.
Revenue recognition for the Company’s Streaming Agreement is disclosed in the accounting policy for deferred revenue.
Share-based compensation
Under the Company's Fourth Amended and Restated 1997 Stock Option Plan, common share options may be granted to executives, employees, consultants and non-employee directors. Compensation expense for such grants is recorded in the consolidated statements of operations, with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair value of the option at the time of grant, measured by reference to the fair value determined using a Black-Scholes valuation model, and is recognized over the vesting periods of the respective options on a graded basis. Consideration paid to the Company on exercise of options is credited to share capital.
Under the Company's Deferred Share Unit ("DSU") plan, DSUs may be granted to executive officers and directors. Compensation expense for such grants is recorded in the consolidated statements of operation with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair values at the time of grant and is recognized over the vesting periods of the respective DSUs. Upon exercise the Company's compensation committee may, at its discretion, issue cash, shares or a combination thereof.
The Company's Share Appreciation Rights ("SARs") plan allows SARs to be issued to executives, employees and directors. These awards are settled in cash on the exercise date equal to the Company's stock price less the strike price. Since these awards are settled in cash, the Company marks-to-market the associated expense for each award at the end of each reporting period using a Black-Scholes model. The Company accounts for these as liability awards and marks-to-market the fair value of the award until final settlement. 
Under the Company's Performance Share Units ("PSU") plan, PSUs may be granted to executives, employees and non-employee directors. Each PSU represents one notional common share that is redeemed for cash based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PSUs vest at the end of a three-year performance. The cash award is determined by multiplying the number of units by the performance adjusting factor, which ranges from 0% to 200%. The performance factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the PSU plan. As the Company was required to settle these awards in cash, they were accounted for as liability awards with corresponding compensation expense recognized. The final PSU grant vested on December 31, 2018 and as a result the Company did not recognize a PSU expense in 2019 and 2020.
Under the Company's 2017 performance and restricted share unit plan (the "2017 PRSU Plan"), performance share units ("2017 PSUs") and restricted share units ("2017 RSUs" and, together with the 2017 PSUs, the "Share Units") may be issued to any employee or officer of the Company or its designated affiliates. Share Units may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market; (iii) a cash payment; or (iv) a combination of (i), (ii) and (iii).
Each PRSU represents one notional common share that is redeemed for common shares or common shares plus cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PRSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of Share Units by the performance adjustment factor, which ranges from 0% to 200%. The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the 2017 PRSU Plan. As the Company has a practice of settling these awards in common shares, they are accounted for as equity awards with corresponding compensation expense recognized.
In February 2020, the Company adopted a new UK Performance Share Unit Plan ("UK PSU Plan") which was approved by Golden Star shareholders on May 7, 2020. Under the UK PSU Plan, performance share units ("UK PSUs") may be issued to UK resident employees of the Company or its designated affiliates. UK PSUs may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market at the election of the participant and subject to consent of the Company; (iii) a cash payment at the election of the participant and subject to consent of the Company; or (iv) a combination of (i), (ii) and (iii).
Each UK PSU represents one notional common share that is redeemed for common shares or common shares and/or cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. UK PSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of UK PSUs by the performance adjustment factor, which ranges from 0% to 200%.
The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies determined by the Compensation Committee of the Board of Directors. The Company plans to settle these awards in common shares of the Company and so they are accounted for as equity awards with corresponding compensation expense recognized.
Right of use asset and lease liabilities
The lease liability is initially measured as the present value of future lease payments discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, each operation’s applicable incremental borrowing rate. The incremental borrowing rate is the rate which the operation would have to pay to borrow, over a similar term and with a similar security, the funds necessary to obtain an asset of similar value to the right-of-use asset in a similar economic environment. 
Lease payments included in the measurement of the lease liability comprise the following: fixed payments, including in-substance fixed payments, less any lease incentives receivable, variable lease payments that depend on an index or a rate, initially measured using the index or rate as at the commencement date, amounts expected to be payable by the Company under residual value guarantees, the exercise price of a purchase option if the Company is reasonably certain to exercise that option, and payments of penalties for terminating the lease, if the Company expects to exercise an option to terminate the lease.
The lease liability is subsequently measured by increasing the carrying amount to reflect interest on the lease liability, reducing the carrying amount to reflect lease payments made, and remeasuring the carrying amount to reflect any reassessment or lease modifications.
The lease liability is remeasured when there is a change in future lease payments arising from a change in an index or rate, if there is a change in the Company’s estimate of the amount expected to be payable under a residual value guarantee, or if the Company changes its assessment of whether it will exercise a purchase, extension or termination option. 
The right-of-use asset is initially measured at cost, which comprises the following: the amount of the initial measurement of the lease liability, any lease payments made at or before the commencement date, less any lease incentives received, any initial direct costs incurred by the Company, and an estimate of costs to be incurred by the Company in dismantling and removing the underlying asset, restoring the site on which it is located or restoring the underlying asset to the condition required by the terms and conditions of the lease, unless those costs are incurred to produce inventories.
The right-of-use asset is subsequently measured at cost, less any accumulated depreciation and any accumulated impairment losses, and adjusted for any remeasurement of the lease liability. It is depreciated in accordance with the Company’s accounting policy for plant and equipment, from the commencement date to the earlier of the end of its useful life or the end of the lease term. 
Each lease payment is allocated between the lease liability and finance cost. The finance cost is charged to consolidated statements of operations over the lease period so as to produce a constant periodic rate of interest on the remaining balance of the liability for each period.
On the consolidated balance sheets, right-of-use assets and lease liabilities are reported in mineral properties, plant and equipment and debt and lease liabilities, respectively.
Financial instruments
Financial assets
The Company recognizes all financial assets initially at fair value and classifies them into one of the following measurement categories: fair value through profit or loss (“FVTPL”), fair value through other comprehensive income (“FVOCI”) or amortized cost, as appropriate.
The Company assesses credit risk on accounts and other receivables at the end of each reporting period, measuring expected credit losses using a provision based matrix based on factors that are specific to the respective trade receivables, and changes in credit risk since the initial recognition of the respective financial instrument.
Financial liabilities
The Company recognizes all financial liabilities initially at fair value and classifies them as either FVTPL or loans and borrowings, as appropriate. The Company has not classified any of its derivatives as hedging instruments in an effective hedge.
Derivatives
From time to time the Company may utilize foreign exchange and commodity price derivatives to manage exposure to fluctuations in foreign currency exchange rates and gold prices, respectively. The Company does not employ derivative financial instruments for trading purposes or for speculative purposes. Derivative instruments are recorded on the balance sheet at fair value with changes in fair value recorded in the consolidated statements of operations. The Company did not have any foreign exchange derivatives outstanding at December 31, 2020.
7% Convertible Debentures embedded derivative
The Company's 7% Convertible Debentures embedded derivative is considered a financial instrument at FVTPL. The embedded derivative was recorded at fair value on the date of debt issuance. It is subsequently remeasured at fair value at each reporting date, and the changes in the fair value are recorded in the consolidated statements of operations. The fair value of the embedded derivative is determined using a convertible note valuation model, using assumptions based on market conditions existing at the reporting date.
Non-hedge derivative contracts
The non-hedge accounted costless collar contracts are considered FVTPL financial instruments with fair value determined using pricing models that utilize a variety of observable inputs that are a combination of quoted prices, applicable yield curves and credit spreads. The non-hedge derivative contracts are included within derivative liabilities on the balance sheet, with liabilities for positions expiring within one year classed as current derivative liabilities.
Share capital
Common shares are classified as equity. Costs directly attributable to the issue of new shares or share options are shown in equity as a deduction, net of tax, from the gross proceeds.
Discontinued operation
A discontinued operation is a component of the Company's business, the operations and cash flows of which can be clearly distinguishable from the rest of the Company and which:
represents a separate major line of business or geographic area of operations;
is part of a single coordinated plan to dispose of a separate major line of business or geographic area of operations; or
is a subsidiary acquired exclusively with a view to re-sale.

When an operation is classified as discontinued, the comparative consolidated statement of operations is re-presented as if the operation had been discontinued from the start of the comparative year.

Deferred consideration
Where settlement of any part of cash consideration is deferred, the amounts receivable in the future are discounted to their present value as at the date of disposal.
The fair value of any contingent consideration is determined based on present value and the discount rate used is adjusted for counterparty or own credit risk. Any changes in fair value are recognized in the consolidated statement of operations.

Changes in accounting policies
The Company has adopted the following revised accounting standard effective January 1, 2020. The changes were made in accordance with the applicable transitional provisions.
Definition of a Business (Amendments to IFRS 3)

The amendments in Definition of a Business (Amendments to IFRS 3) are changes to Appendix A Defined terms, the application guidance, and the illustrative examples of IFRS 3 only. It:

clarifies that to be considered a business, an acquired set of activities and assets must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs; 
narrow the definitions of a business and of outputs by focusing on goods and services provided to customers and by removing the reference to an ability to reduce costs; 
add guidance and illustrative examples to help entities assess whether a substantive process has been acquired; 
remove the assessment of whether market participants are capable of replacing any missing inputs or processes and continuing to produce outputs; and 
add an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business.

There was no accounting impact to the consolidated financial statements on adoption of this standard.

The Company will adopt the following revised accounting standard effective January 1, 2021, with no accounting impact to the consolidated financial statements for the year ended December 31, 2020.

IBOR Reform - phase 2 amendments

In August 2020, the IASB published Phase 2 of its amendments to IFRS 9, IFRS 7 and IFRS 16 to address issues that impact financial reporting at the time of IBOR replacement with alternative rates. The amendments provide a practical expedient to ease the potential burden of accounting or changes in contractual cash flows, provide relief from specific hedge accounting requirements, and add disclosure requirements, at the time of IBOR replacement. The amendments are effective for annual reporting periods beginning on or after January 1, 2021, with early adoption permitted. The Company is currently evaluating the impact of these amendments on its consolidated financial statements.
v3.21.1
CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS
12 Months Ended
Dec. 31, 2020
Accounting Policies, Changes In Accounting Estimates And Errors [Abstract]  
CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS
3. SUMMARY OF ACCOUNTING POLICIES
Cash and cash equivalents
Cash includes cash deposits in any currency residing in chequing and sweep accounts. Cash equivalents consist of money market funds and other highly liquid investments purchased with maturities of three months or less. Investments with maturities greater than three months and up to one year are classified as short-term investments, while those with maturities in excess of one year are classified as long-term investments. Cash equivalents and short-term investments are stated at amortized cost, which typically approximates market value.
Restricted cash
Cash balances that are subject to legal or contractual obligations are classified separately on the consolidated balance sheets as restricted cash.
Inventories
Inventory classifications include "stockpiled ore," "in-process inventory," "finished goods inventory" and "materials and supplies". The stated value of all production inventories includes direct production costs and attributable overhead and depreciation incurred to bring the materials to their current point in the processing cycle. General and administrative costs for corporate offices are not included in any inventories.
Stockpiled ore represents coarse ore that has been extracted from the mine and is stored for future processing. Stockpiled ore is measured by estimating the number of tonnes (by physical surveys) added to, or removed from the stockpile, the number of contained ounces (based on assay data) and estimated gold recovery percentage. Stockpiled ore value is based on the costs incurred (including depreciation and amortization) in bringing the ore to the stockpile. Costs are added to the stockpiled ore based on current mining costs per tonne and are removed at the average cost per tonne of ore in the stockpile.
In-process inventory represents material that is currently being treated in the processing plants to extract the contained gold and to transform it into a saleable product. The amount of gold in the in-process inventory is determined by assay and by measure of the quantities of the various gold-bearing materials in the recovery process. The in-process gold is valued at the average of the beginning inventory and the cost of material fed into the processing stream plus in-process conversion costs including applicable mine-site overheads, depreciation and amortization related to the processing facilities.
Finished goods inventory is saleable gold in the form of doré bars. Included in the costs are the direct costs of the mining and processing operations as well as direct mine-site overheads, amortization and depreciation.
Materials and supplies inventories consist mostly of equipment parts and other consumables required in the mining and ore processing activities.
All inventories are valued at the lower of average cost or net realizable value.
Property, plant and equipment
Property, plant and equipment assets, including machinery, processing equipment, mining equipment, mine site facilities, buildings, vehicles and expenditures that extend the life of such assets, are initially recorded at cost including acquisition and installation costs. Property, plant and equipment are subsequently measured at cost, less accumulated depreciation and accumulated impairment losses.
The costs of self-constructed assets include direct construction costs and direct overhead costs during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Depreciation for mobile equipment and other assets having estimated lives shorter than the estimated life of the ore reserves is calculated using the straight-line method at rates which depreciate the cost of the assets, less their anticipated residual values, if any, over their estimated useful lives. Mobile mining equipment is amortized over a five-year life. Assets, such as processing plants, power generators and buildings, which have an estimated life equal to or greater than the estimated life of the ore reserves, are amortized over the life of the proven and probable reserves of the associated mining property using a units-of-production amortization method, less their anticipated residual values, if any. The net book value of property, plant and equipment assets is charged against income if the mine site is abandoned and it is determined that the assets cannot be economically transferred to another project or sold.
The residual values, useful lives and method of depreciation of property, plant and equipment are reviewed at each reporting period end and adjusted prospectively, if appropriate.
Gains and losses on the disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount and are recognized net in the consolidated statement of operations.
Mining properties
Mining property assets, including property acquisition costs, tailings storage facilities, mine-site development and drilling costs where proven and probable reserves have previously been established, pre-production waste stripping, condemnation drilling, roads, feasibility studies and wells are recorded at cost. The costs of self-constructed assets include direct construction costs, direct overhead costs and allocated interest during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Mining property assets are amortized over the life of the proven and probable reserves to which they relate, using a units-of-production amortization method. At open pit mines the costs of removing overburden from an ore body in order to expose ore during its initial development period are capitalized.
Underground mine development costs
Underground mine development costs include development costs to build new shafts, drifts and ramps that will enable the Company to physically access ore underground. The time over which the Company will continue to incur these costs depends on the mine life. These underground development costs are capitalized as incurred. Capitalized underground development costs incurred to enable access to specific ore blocks or areas of the underground mine, and which only provide an economic benefit over the period of mining that ore block or area, are depreciated on a units-of-production basis, whereby the denominator is estimated ounces of gold in proven and probable reserves and the portion of resources within that ore block or area that is considered probable of economic extraction. If capitalized underground development costs provide an economic benefit over the entire mine life, the costs are depreciated on a units-of-production basis, whereby the denominator is the estimated ounces of gold in total accessible proven and probable reserves and the portion of resources that is considered probable of economic extraction.
Borrowing costs
Borrowing costs attributable to the acquisition, construction or production of a qualifying asset are capitalized. Qualifying assets are assets that require a significant amount of time to prepare for their intended use, including projects that are in the exploration and evaluation, development or construction stages. Capitalized borrowing costs are considered an element of the cost of the qualifying asset which is determined based on gross expenditures incurred on an asset. Capitalization ceases when the asset is substantially complete or if active development is suspended or ceases. Where the funds used to finance a qualifying asset form part of general borrowings, the amount capitalized is calculated using a weighted average of rates applicable to the relevant borrowings during the period. Where funds borrowed are directly attributable to a qualifying asset, the amount capitalized represents the borrowing costs specific to those borrowings. Other borrowing costs are recognized as an expense in the period in which they are incurred.
Impairment of long-lived assets
The Company assesses at each reporting period whether there is an indication that an asset or group of assets may be impaired. When impairment indicators exist, the Company estimates the recoverable amount of the asset and compares it against the asset's carrying amount. The recoverable amount is the higher of its fair value less cost of disposal ("FVLCD") and the asset's value in use ("VIU"). If the carrying amount exceeds the recoverable amount, an impairment loss is recorded in the consolidated statement of operations.
In assessing VIU, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset not already reflected in the estimates of future cash flows. The cash flows are based on best estimates of expected future cash flows from the continued use of the asset and its eventual disposal.
FVLCD is best evidenced if obtained from an active market or binding sale agreement. Where neither exists, the fair value is based on the best estimates available to reflect the amount that could be received from an arm's length transaction.
Future cash flows are based on estimated quantities of gold and other recoverable metals, expected price of gold (considering current and historical prices, price trends and related factors), production levels and cash costs of production, capital and reclamation costs, all based on detailed engineered life-of-mine plans.
Numerous factors including, but not limited to, unexpected grade changes, gold recovery variances, shortages of equipment and consumables, and equipment failures could impact our ability to achieve forecasted production schedules from proven and probable reserves. Additionally, commodity prices, capital expenditure requirements and reclamation costs could differ from
the assumptions used in the cash flow models used to assess impairment. The ability to achieve the estimated quantities of recoverable minerals from exploration stage mineral interests involves further risks in addition to those factors applicable to mineral interests where proven and probable reserves have been identified, due to the lower level of confidence that the identified mineralized material can ultimately be mined economically.
If an impairment loss reverses in a subsequent period, the carrying amount (post reversal) of the related asset is increased to the revised estimate of recoverable amount to the extent that the increased carrying amount does not exceed the carrying amount that would have been determined had no impairment loss been recognized for the asset previously. Reversals of impairment losses are recognized in the consolidated statement of operations in the period the reversals occur.
Material changes to any of the factors or assumptions discussed above could result in future asset impairments.
Rehabilitation provisions
The Company records a liability and corresponding asset for the present value of the estimated costs of legal and constructive obligations for future site reclamation and closure where the liability is probable, and a reasonable estimate can be made of the obligation. The estimated present value of the obligation is reassessed on a periodic basis or when new material information becomes available. Increases or decreases to the obligation usually arise due to changes in legal or regulatory requirements, the extent of environmental remediation required, methods of reclamation, cost estimates, inflation rates, or discount rates. Changes to the provision for reclamation and remediation obligations related to operating mines, which are not the result of current production of inventory, are recorded with an offsetting change to the related asset. Changes to the provision for reclamation and remediation obligations related to suspended mine operations are recognized in the consolidated statements of operations. The present value is determined based on current market assessments of the time value of money using discount rates based on the risk-free rate maturing approximating the timing of expected expenditures to be incurred and adjusted for country related risks. The periodic unwinding of the discount is recognized in the consolidated statement of operations as a finance expense.
Deferred revenue
Deferred revenue consists of: (i) initial cash payments received by the Company for future delivery of payable gold under the terms of the Company’s Streaming Agreement as defined in Note 18, Deferred Revenue, and (ii) a significant financing component of the Company’s Streaming Agreement. Deferred revenue is increased as interest expense is recognized based on the implicit interest rate of the discounted cash flows arising from the expected delivery of ounces under the Company’s Streaming Agreement.
The amount by which the deferred revenue balance is reduced and recognized into revenue is based on a rate per ounce of gold delivered under the Streaming Agreement. This rate per ounce of gold delivered relating to the payments received by the Company is based on the remaining deferred revenue balance divided by the ounces that are expected to be delivered over the term of the Stream Agreement.
As the Company’s Streaming Agreement contains a variable component, IFRS 15 requires that the transaction price be updated and re-allocated on an ongoing basis. As a result, the deferred revenue recognized per ounce of gold delivered under the Streaming Agreement will require an adjustment each time there is a significant change in the underlying gold production profile of a mine. Should a change in the transaction price be necessary, a cumulative catch-up adjustment to revenue will be made in the period in which the change occurs, to reflect the updated production profile expected to be delivered under the Streaming Agreement.
Foreign currency transactions
The Company's presentation currency of its consolidated financial statements is the U.S. dollar, as is the functional currency of its operations. The functional currency of all consolidated subsidiaries is the U.S. dollar. All values are rounded to the nearest thousand, unless otherwise stated.
Monetary assets and liabilities denominated in foreign currencies are translated into U.S. dollars at period end exchange rates. Non-monetary assets and liabilities denominated in foreign currencies that are measured at fair value are translated into U.S. dollars at the exchange rate at the date that the fair value was determined. Income and expense items are translated at the exchange rate in effect on the date of the transaction. Exchange gains and losses resulting from the translation of these amounts are included in net loss, except those arising on the translation of equity investments at fair value through other comprehensive income that are recorded in other comprehensive income. Non-monetary assets and liabilities denominated in foreign currencies that are measured at historical cost are translated at the exchange rate in effect at the transaction date.
Income taxes
Income taxes comprise the provision for (or recovery of) taxes actually paid or payable (current taxes) and for deferred taxes.
Current taxes are based on taxable earnings in the year. Current tax is calculated using tax rates and laws that were enacted or substantively enacted at the balance sheet date in the respective jurisdictions.
Current income tax assets and current income tax liabilities are only offset if a legally enforceable right exists to offset the amounts and the Company intends to settle on a net basis or to realize the asset and settle the liability simultaneously.
Deferred income tax assets and liabilities are recognized for the expected future tax consequences attributable to temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. Deferred income tax assets and liabilities are computed using enacted or substantially enacted income tax rates in effect when the temporary differences are expected to reverse. The effect on the deferred tax assets and liabilities of a change in tax rates is recognized in the period of substantial enactment. The provision for or the recovery of deferred taxes is based on the changes in deferred tax assets and liabilities during the period.
The carrying amount of deferred income tax assets or liabilities are reviewed at the end of each reporting period and recognized to the extent that it is probable that taxable earnings will be available against which deductible temporary differences can be utilized.
Net income/(loss) per share
Basic income/(loss) per share of common stock is calculated by dividing income available to Golden Star's common shareholders by the weighted average number of common shares issued and outstanding during the period. In periods with earnings, the calculation of diluted net income per common share uses the treasury stock method to compute the dilutive effects of stock options, convertible debentures and other potentially dilutive instruments. In periods of loss, diluted net loss per share is equal to basic loss per share.
Revenue recognition
Revenue from the sale of gold is recognized when the Company transfers control over to a customer. The Company’s spot sales of gold are transported to a gold refiner who locates a buyer and arranges sale of the gold. Effective March 20, 2020, the sale generally completes on the day of arrival of gold at the refinery in South Africa as a consequence of the change in shipment logistics due to the COVID-19 pandemic. Previously, the sale of gold completed on the same day the gold was shipped from the mine site. The sales price is generally set with reference to the London A.M. or P.M. fix on the day of arrival of gold at the refinery.
Revenue recognition for the Company’s Streaming Agreement is disclosed in the accounting policy for deferred revenue.
Share-based compensation
Under the Company's Fourth Amended and Restated 1997 Stock Option Plan, common share options may be granted to executives, employees, consultants and non-employee directors. Compensation expense for such grants is recorded in the consolidated statements of operations, with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair value of the option at the time of grant, measured by reference to the fair value determined using a Black-Scholes valuation model, and is recognized over the vesting periods of the respective options on a graded basis. Consideration paid to the Company on exercise of options is credited to share capital.
Under the Company's Deferred Share Unit ("DSU") plan, DSUs may be granted to executive officers and directors. Compensation expense for such grants is recorded in the consolidated statements of operation with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair values at the time of grant and is recognized over the vesting periods of the respective DSUs. Upon exercise the Company's compensation committee may, at its discretion, issue cash, shares or a combination thereof.
The Company's Share Appreciation Rights ("SARs") plan allows SARs to be issued to executives, employees and directors. These awards are settled in cash on the exercise date equal to the Company's stock price less the strike price. Since these awards are settled in cash, the Company marks-to-market the associated expense for each award at the end of each reporting period using a Black-Scholes model. The Company accounts for these as liability awards and marks-to-market the fair value of the award until final settlement. 
Under the Company's Performance Share Units ("PSU") plan, PSUs may be granted to executives, employees and non-employee directors. Each PSU represents one notional common share that is redeemed for cash based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PSUs vest at the end of a three-year performance. The cash award is determined by multiplying the number of units by the performance adjusting factor, which ranges from 0% to 200%. The performance factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the PSU plan. As the Company was required to settle these awards in cash, they were accounted for as liability awards with corresponding compensation expense recognized. The final PSU grant vested on December 31, 2018 and as a result the Company did not recognize a PSU expense in 2019 and 2020.
Under the Company's 2017 performance and restricted share unit plan (the "2017 PRSU Plan"), performance share units ("2017 PSUs") and restricted share units ("2017 RSUs" and, together with the 2017 PSUs, the "Share Units") may be issued to any employee or officer of the Company or its designated affiliates. Share Units may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market; (iii) a cash payment; or (iv) a combination of (i), (ii) and (iii).
Each PRSU represents one notional common share that is redeemed for common shares or common shares plus cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PRSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of Share Units by the performance adjustment factor, which ranges from 0% to 200%. The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the 2017 PRSU Plan. As the Company has a practice of settling these awards in common shares, they are accounted for as equity awards with corresponding compensation expense recognized.
In February 2020, the Company adopted a new UK Performance Share Unit Plan ("UK PSU Plan") which was approved by Golden Star shareholders on May 7, 2020. Under the UK PSU Plan, performance share units ("UK PSUs") may be issued to UK resident employees of the Company or its designated affiliates. UK PSUs may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market at the election of the participant and subject to consent of the Company; (iii) a cash payment at the election of the participant and subject to consent of the Company; or (iv) a combination of (i), (ii) and (iii).
Each UK PSU represents one notional common share that is redeemed for common shares or common shares and/or cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. UK PSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of UK PSUs by the performance adjustment factor, which ranges from 0% to 200%.
The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies determined by the Compensation Committee of the Board of Directors. The Company plans to settle these awards in common shares of the Company and so they are accounted for as equity awards with corresponding compensation expense recognized.
Right of use asset and lease liabilities
The lease liability is initially measured as the present value of future lease payments discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, each operation’s applicable incremental borrowing rate. The incremental borrowing rate is the rate which the operation would have to pay to borrow, over a similar term and with a similar security, the funds necessary to obtain an asset of similar value to the right-of-use asset in a similar economic environment. 
Lease payments included in the measurement of the lease liability comprise the following: fixed payments, including in-substance fixed payments, less any lease incentives receivable, variable lease payments that depend on an index or a rate, initially measured using the index or rate as at the commencement date, amounts expected to be payable by the Company under residual value guarantees, the exercise price of a purchase option if the Company is reasonably certain to exercise that option, and payments of penalties for terminating the lease, if the Company expects to exercise an option to terminate the lease.
The lease liability is subsequently measured by increasing the carrying amount to reflect interest on the lease liability, reducing the carrying amount to reflect lease payments made, and remeasuring the carrying amount to reflect any reassessment or lease modifications.
The lease liability is remeasured when there is a change in future lease payments arising from a change in an index or rate, if there is a change in the Company’s estimate of the amount expected to be payable under a residual value guarantee, or if the Company changes its assessment of whether it will exercise a purchase, extension or termination option. 
The right-of-use asset is initially measured at cost, which comprises the following: the amount of the initial measurement of the lease liability, any lease payments made at or before the commencement date, less any lease incentives received, any initial direct costs incurred by the Company, and an estimate of costs to be incurred by the Company in dismantling and removing the underlying asset, restoring the site on which it is located or restoring the underlying asset to the condition required by the terms and conditions of the lease, unless those costs are incurred to produce inventories.
The right-of-use asset is subsequently measured at cost, less any accumulated depreciation and any accumulated impairment losses, and adjusted for any remeasurement of the lease liability. It is depreciated in accordance with the Company’s accounting policy for plant and equipment, from the commencement date to the earlier of the end of its useful life or the end of the lease term. 
Each lease payment is allocated between the lease liability and finance cost. The finance cost is charged to consolidated statements of operations over the lease period so as to produce a constant periodic rate of interest on the remaining balance of the liability for each period.
On the consolidated balance sheets, right-of-use assets and lease liabilities are reported in mineral properties, plant and equipment and debt and lease liabilities, respectively.
Financial instruments
Financial assets
The Company recognizes all financial assets initially at fair value and classifies them into one of the following measurement categories: fair value through profit or loss (“FVTPL”), fair value through other comprehensive income (“FVOCI”) or amortized cost, as appropriate.
The Company assesses credit risk on accounts and other receivables at the end of each reporting period, measuring expected credit losses using a provision based matrix based on factors that are specific to the respective trade receivables, and changes in credit risk since the initial recognition of the respective financial instrument.
Financial liabilities
The Company recognizes all financial liabilities initially at fair value and classifies them as either FVTPL or loans and borrowings, as appropriate. The Company has not classified any of its derivatives as hedging instruments in an effective hedge.
Derivatives
From time to time the Company may utilize foreign exchange and commodity price derivatives to manage exposure to fluctuations in foreign currency exchange rates and gold prices, respectively. The Company does not employ derivative financial instruments for trading purposes or for speculative purposes. Derivative instruments are recorded on the balance sheet at fair value with changes in fair value recorded in the consolidated statements of operations. The Company did not have any foreign exchange derivatives outstanding at December 31, 2020.
7% Convertible Debentures embedded derivative
The Company's 7% Convertible Debentures embedded derivative is considered a financial instrument at FVTPL. The embedded derivative was recorded at fair value on the date of debt issuance. It is subsequently remeasured at fair value at each reporting date, and the changes in the fair value are recorded in the consolidated statements of operations. The fair value of the embedded derivative is determined using a convertible note valuation model, using assumptions based on market conditions existing at the reporting date.
Non-hedge derivative contracts
The non-hedge accounted costless collar contracts are considered FVTPL financial instruments with fair value determined using pricing models that utilize a variety of observable inputs that are a combination of quoted prices, applicable yield curves and credit spreads. The non-hedge derivative contracts are included within derivative liabilities on the balance sheet, with liabilities for positions expiring within one year classed as current derivative liabilities.
Share capital
Common shares are classified as equity. Costs directly attributable to the issue of new shares or share options are shown in equity as a deduction, net of tax, from the gross proceeds.
Discontinued operation
A discontinued operation is a component of the Company's business, the operations and cash flows of which can be clearly distinguishable from the rest of the Company and which:
represents a separate major line of business or geographic area of operations;
is part of a single coordinated plan to dispose of a separate major line of business or geographic area of operations; or
is a subsidiary acquired exclusively with a view to re-sale.

When an operation is classified as discontinued, the comparative consolidated statement of operations is re-presented as if the operation had been discontinued from the start of the comparative year.

Deferred consideration
Where settlement of any part of cash consideration is deferred, the amounts receivable in the future are discounted to their present value as at the date of disposal.
The fair value of any contingent consideration is determined based on present value and the discount rate used is adjusted for counterparty or own credit risk. Any changes in fair value are recognized in the consolidated statement of operations.
4. CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS
Preparation of our consolidated financial statements in conformity with IFRS requires Management to make judgments, estimates and assumptions that can affect reported amounts of assets, liabilities, revenues and expenses and the accompanying disclosures. Estimates and assumptions are continuously evaluated and are based on Management's historical experience and on other assumptions we believe to be reasonable under the circumstances. However, uncertainty about these judgments, estimates and assumptions could result in outcomes that require a material adjustment to the carrying amount of assets or liabilities affected in future periods.
Deferred revenue
Significant judgment is required in determining the appropriate accounting for the Streaming Agreement that has been entered into. Management has determined that the Company assumes significant business risk associated with the timing and amount of ounces of gold ounces being delivered. As such, the deposits received have been recorded as deferred revenue liabilities in the consolidated balance sheet. The amount of gold ounces expected to be delivered can increase or decrease from previous estimates.

The amount by which the deferred revenue balance is reduced and recognized into revenue is based on a rate per ounce of gold delivered under the Streaming Agreement. This rate per ounce of gold delivered relating to the payments received by the Company is based on the remaining deferred revenue balance divided by the ounces that are expected to be delivered over the term of the Streaming Agreement.
As the Company’s Streaming Agreement contains a variable component, IFRS 15 requires that the transaction price be updated and re-allocated on an ongoing basis. As a result, the deferred revenue recognized per ounce of gold delivered under the Streaming Agreement will require an adjustment annually and each time there is a significant change in the underlying forecast gold production profile of a mine. Should a change in the transaction price be necessary, a cumulative catch-up adjustment to revenue will be made in the period in which the change occurs, to reflect the updated forecast production profile expected to be delivered under the Streaming Agreement.
Discontinued operations
Significant judgement was applied regarding classification of Prestea as a discontinued operation and whether the sale of Prestea represents a separate major line of business or geographical area. Management has considered that Prestea represents a separate major line of business considering Prestea is a separate segment and legal entity that has its own management team, employees, books and records and has a separate operating mine, processing plant and a different mining process than the Wassa mine and does not blend any of its gold inventories with Wassa. Further, the operating mine and processing plant are located in different geographic areas in Ghana. Accordingly, it was classified as a discontinued operation.

Mineral reserves and resources
Determining mineral reserves and resources is a complex process involving numerous variables and is based on a professional evaluation using accepted international standards for the assessment of mineral reserves. Estimation is a subjective process, and the accuracy of such estimates is a function of the quantity and quality of available data, the assumptions made and judgments used in engineering and geological interpretation. Mineral reserve estimation may vary as a result of changes in the price of gold, production costs, and with additional knowledge of the ore deposits and mining conditions.
Differences between Management's assumptions, including economic assumptions such as metal prices and market conditions, could have a material effect in the future on the Company's results and financial position, particularly a change in the rate of depreciation and amortization of the related mining assets and the recognition of deferred revenue.
Units of production depreciation
The mineral properties and a large portion of the property, plant and equipment is depreciated/amortized using the units of production method over the expected operating life of the mine based on estimated recoverable ounces of gold, which are the prime determinants of the life of a mine. Estimated recoverable ounces of gold include proven and probable mineral reserves. Changes in the estimated mineral reserves will result in changes to the depreciation charges over the remaining life of the operation. A decrease in the mineral reserves would increase depreciation and amortization expense and this could have a material impact on the operating results. The amortization base is updated on an annual basis based on the new mineral reserve and resource estimates.
Carrying value of assets and impairment charges
The Company undertakes a review of its assets at each reporting period to determine whether any indication of impairment exists. Where an indicator of impairment exists, a formal estimate of the recoverable amount of the asset or cash-generating unit ("CGU") is made, which is considered to be the higher of its FVLCD and VIU. An impairment loss is recognized when the
carrying value of the asset or CGU is higher than the recoverable amount. In undertaking this review, Management is required to make significant estimates of, amongst other things, discount rates, future production and sale volumes, metal prices, reserves and resource quantities, future operating and capital costs and reclamation costs to the end of the mine's life. These estimates are subject to various risks and uncertainties, which may ultimately have an effect on the expected recoverability of the carrying values of the asset or CGU. In determining a CGU, Management has examined the smallest identifiable group of assets that generates cash inflows that are largely independent of cash inflows from other assets or group of assets.
Assessment of impairment and reverse impairment indicators
Management applies significant judgment in assessing whether indicators of impairment or reverse impairment exist for an asset or group of assets which would necessitate impairment testing. Internal and external factors such as significant changes in the use of the asset, commodity prices and production costs are used by Management in determining whether there are any indicators.
Rehabilitation provisions
Environmental reclamation and closure liabilities are recognized at the time of environmental disturbance, in amounts equal to the discounted value of expected future reclamation and closure costs. The estimated future cash costs of such liabilities are based primarily upon environmental and regulatory requirements in the jurisdictions in which we operate as well as any other constructive obligations that exist. The liability represents Management's best estimates of cash required to settle the liability, inflation, assumptions of risks associated with future cash flows and the applicable risk-free interest rates for discounting the future cash outflow. The liability is reassessed and remeasured at each reporting date.
Fair value of financial instruments, including embedded derivatives
Where the fair value of financial assets and financial liabilities recorded in the financial statements cannot be derived from active markets, their fair value is determined using valuation techniques including the discounted cash flow model. The inputs to these models are taken from observable markets where possible, but where this is not feasible, a degree of judgment is required in establishing fair values. The judgments include considerations of inputs such as liquidity risk, credit risk and volatility. Changes in assumptions about these factors could affect the reported fair value of financial instruments.
When measuring the fair value of an asset or liability, the Company uses observable market data to the greatest extent possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows:
    Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities
    Level 2: inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices)
    Level 3: inputs for the asset or liability that are not based on observable market data (unobservable inputs)
Income taxes
We deal with uncertainties and judgments in the application of complex tax regulations in the various jurisdictions where our properties are located. The amount of taxes paid is dependent upon many factors, including negotiations with taxing authorities in the various jurisdictions and resolution of disputes arising from our international tax audits. We recognize potential liabilities and record tax liabilities for anticipated tax audit issues in our various tax jurisdictions based on our best estimate of additional taxes payable. We adjust these tax estimates in consideration of changing facts and circumstances, however, due to the complexity of some of these uncertainties, the ultimate resolution may result in payment that is materially different from our estimates of our tax liabilities. If our estimate of tax liability proves to be less than the ultimate assessment, an additional charge to expense would result. If the estimate of tax liabilities proves to be greater than the ultimate assessment, a tax benefit is recognized.
A deferred tax asset is recognized to the extent that it is probable that taxable earnings will be available against which deductible temporary differences can be utilized.
Expected credit losses
Significant judgement is required in determining the recoverability of deferred consideration recognized from the sale of Prestea (Note 5). Specifically, Management is required to estimate the probability of default and the loss given default, at the end of each reporting period. Management assesses the credit risk by taking into account factors that are both specific to the receivable and the general economic environment in which the relevant parties operate.
v3.21.1
SALE OF PRESTEA
12 Months Ended
Dec. 31, 2020
Disclosure Of Detailed Information Of Non-Current Assets Held For Sale And Discontinued Operations [Abstract]  
SALE OF PRESTEA
5. SALE OF PRESTEA
On July 26, 2020, the Company and its wholly-owned subsidiary, Caystar Holdings (“Caystar”), entered into a share purchase agreement (the "SPA") with Future Global Resources Limited ("FGR"), a subsidiary of Blue International Holdings (“BIH”), providing for the sale by Caystar and the purchase by FGR of all the issued and outstanding share capital of Bogoso Holdings ("Bogoso"), the holder of the 90% shares of Golden Star (Bogoso/Prestea) Limited (“GSBPL”).

Consideration

On September 30, 2020, the Company completed the sale of its 90% interest in Prestea to FGR for a deferred consideration of $34.3 million which is guaranteed by BIH and payable by FGR to Golden Star in the following tranches:

$5 million of cash to be paid on the earlier of (i) the date at which FGR puts in place a new reclamation bond with the Environmental Protection Agency of Ghana in relation to Prestea, (ii) March 30, 2021;
$10 million of cash and the net working capital adjusted balancing payment (as described in the SPA) which as at the date hereof amounts to $4.3 million to be paid on July 31, 2021; and
$15 million of cash to be paid on July 31, 2023.

At the time of the sale, the $15 million consideration due on July 31, 2023 was discounted at the weighted average cost of capital of 7% (Note 13). Management has calculated the net working capital adjusted balancing payment of the deferred consideration in accordance with the terms of the SPA and is not expecting any material adjustments to the balance.

Contingent Payment

In addition to the deferred consideration, a contingent payment of up to $40 million may become payable by FGR to Golden Star conditional upon the occurrence of the milestones set out hereinafter in respect of the development of the Bogoso Sulfide Project (the "Contingent Payment"). The triggering event for the Contingent Payment is the earlier of (i) the date of FGR’s formal decision to proceed with the Bogoso Sulfide Project is made, or (ii) the date on which an aggregate of 5% of the sulfide mineral resources as stated at the end of 2019, being 1.76 million ounces of measured and indicated resources and 0.07 million ounces of inferred resource has been extracted (the earlier of (i) and (ii) being the “Decision to Proceed”). The quantum of the Contingent Payment is determined by reference to the average spot gold price for the 90-day period preceding the date of the Decision to Proceed and shall amount to:

$20 million, if the average spot gold price is less than or equal to $1,400 per ounce ("/oz");
$30 million, if the average spot gold price is greater than $1,400/oz but less than or equal to $1,700/oz; or
$40 million, if the average spot gold price is greater than $1,700/oz.

The Contingent Payment is payable in two tranches:

50% at the time of (i) the Decision to Proceed, or (ii) declaration that 5% of the sulfide mineral resources have been extracted; and
50% at the time of the first anniversary of (i) achieving commercial production following the Decision to Proceed, or (ii) the declaration that 5% of the sulfide mineral resources have been extracted.

The amount recognized for the Contingent Payment on completion of the sale of Prestea is $nil as there has been no occurrence of the aforementioned milestones upon which the Contingent Payment is payable.

Modification of the Royal Gold Streaming Agreement

Concurrent with the completion of the sale of Prestea, Caystar Finance Co. ("Caystar Finance"), a wholly-owned subsidiary of Golden Star, and RGLD Gold AG, an affiliate of Royal Gold, Inc., entered into an amended and restated Streaming Agreement (the “RG Streaming Agreement”) to inter alia assign and transfer the rights and obligations to deliver Prestea gold production from Caystar Finance to Bogoso. As a result of the latter, Wassa now retains the remaining Tier One streaming obligation toward RGLD Gold AG, which relates to the delivery of gold at a rate of 10.5% of production with a cash purchase price of 20% of the spot prices until 240,000 ounces have been delivered. Following the delivery of the remaining Tier One obligation, the streaming obligation at Wassa will transition into the Tier Two structure, pursuant to which Golden Star will deliver to RGLD Gold AG 5.5% of its gold production with a cash purchase price of 30% of the spot price.
Significant judgment was required when determining the amount of the consideration to be allocated to the remaining performance obligations relating to the remaining Tier One ounces and the subsequent delivery of the Tier Two ounces from Wassa in the Streaming Agreement, with reference to the underlying life of mine plans and the corresponding derecognition of the deferred revenue balance relating to the remaining Prestea ounces. Management’s estimates of life of mine plans are tied to the reserves and resources estimates which are reviewed and approved by the Company’s Qualified Persons pursuant to National Instrument 43-101 (“NI 43-101”).

The carrying amounts of the Prestea net liabilities as at the date of sale (September 30, 2020), including the deferred revenue relating to the Prestea portion of the previous stream agreement, and the resulting loss on sale are as follows:

Cash and cash equivalents1,692 
Accounts receivable1,727 
Inventories12,653 
Prepaids and other1,399 
Restricted cash991 
Mining interests82,648 
Total assets101,110 
Accounts payable(39,475)
Rehabilitation provisions(52,867)
Deferred revenue (9,072)
Debt(15)
Total liabilities(101,429)
Carrying value of net liabilities(319)
Fair value of deferred consideration (Note 13)31,679 
Gain on sale of Prestea before non-controlling interest31,998 
Derecognition of non-controlling interest (68,565)
Loss on sale of Prestea(36,567)

The financial results of Prestea for the period to the date of sale (September 30, 2020), as well as the restated comparative period, have been presented as discontinued operations in the consolidated statements of operations and the consolidated statements of cash flows. The components of net loss from discontinued operations and cash flow information for the years ended December 31, 2020 and December 31, 2019 were as follows:
For the Years Ended December 31,
 20202019
Revenue35,731 60,917 
Cost of sales excluding depreciation and amortization44,637 76,217 
Depreciation and amortization5,249 11,920 
Mine operating loss(14,155)(27,220)
Prestea general and administrative expense1,050 1,293 
Other expense, net4,904 (322)
Impairment charges— 56,762 
Loss on sale of Prestea36,567 — 
Loss before finance and tax(56,676)(84,953)
Finance (income)/expense, net(242)3,009 
Net loss from discontinued operations(56,434)(87,962)
Net income/(loss) and comprehensive loss from discontinued operations attributable to non-controlling interest34,224 (15,211)
Net loss and comprehensive loss from discontinued operations attributable to Golden Star shareholders(90,658)(72,751)
In 2019, Management observed a decrease in the Prestea mine’s cash flow reflecting adjustments to key mine planning, cost and working capital assumptions following the conclusion of the independent review of the underground operations at Prestea which resulted in a trigger for an impairment test.

The recoverable amount of the Prestea CGU of $nil was determined based on a discounted cash flow analysis of an indicative life of mine model. This life of mine model is management’s best estimate of the recoverable amount of Prestea’s assets at December 31, 2019.

The impairment test concluded that the recoverable amount of the Prestea CGU using a value in use model was lower than its carrying value as at December 31, 2019. This resulted in an impairment charge of $56.8 million to the consolidated statement of operations and a reduction in the carrying value of Prestea’s assets.

The key assumptions used in determining the recoverable amount of the Prestea CGU included a long term gold price of $1,400 per ounce, discount rate of 7% and life of mine of seven years.

Included in Other expenses for the year ended December 31, 2020 are transition-related expenses and transaction-related costs pertaining to the sale of Prestea of $3.3 million.
For the Years Ended
December 31,
 20202019
Net cash used in operating activities(23,915)(27,280)
Net cash used in investing activities(7,475)(10,923)
Net cash used in financing activities(20)(25)
Net cash used by discontinued operations(31,410)(38,228)
v3.21.1
SEGMENTED INFORMATION
12 Months Ended
Dec. 31, 2020
Disclosure of operating segments [abstract]  
SEGMENTED INFORMATION
6. SEGMENTED INFORMATION
Segmented revenue and results
The Company has reportable segments as identified by the individual mining operations. During 2020 the Company has classified Prestea as a discontinued operation and has revised the disclosure below to not present Prestea as a segment. Segments are operations reviewed by Management. Each segment is identified based on quantitative and qualitative factors.
For the Years Ended December 31,WassaOtherCorporateTotal
2020
Revenue272,481 — — 272,481 
Mine operating expenses107,400 — — 107,400 
Severance charges45 — — 45 
Operating costs from metal inventory1,918 — — 1,918 
Inventory write-off176 — — 176 
Royalties14,883 — — 14,883 
Cost of sales excluding depreciation and amortization124,422 — — 124,422 
Depreciation and amortization23,727 — — 23,727 
Mine operating profit124,332 — — 124,332 
Income tax expense48,266 — — 48,266 
Net loss from continuing operations attributable to non-controlling interest(365)— — (365)
Net income/(loss) from continuing operations attributable to Golden Star71,213 (1,153)(31,542)38,518 
Capital expenditures45,155 — 69 45,224 
2019
Revenue203,820 — — 203,820 
Mine operating expenses98,722 — — 98,722 
Severance charges225 — — 225 
Operating costs from metal inventory299 — — 299 
Royalties10,877 — — 10,877 
Cost of sales excluding depreciation and amortization110,123 — — 110,123 
Depreciation and amortization17,134 — — 17,134 
Mine operating profit76,563 — — 76,563 
Income tax expense27,439 — — 27,439 
Net income from continuing operations attributable to non-controlling interest4,671 — — 4,671 
Net income/(loss) from continuing operations attributable to Golden Star35,357 1,190 (31,230)5,317 
Capital expenditures60,123 — — 60,123 
Segmented Assets
The following table presents the segmented assets:
WassaPresteaOtherCorporateTotal
December 31, 2020
Total assets285,573 — 378 57,910 343,861 
December 31, 2019
Total assets 232,182 94,453 2,951 43,022 372,608 
v3.21.1
REVENUE
12 Months Ended
Dec. 31, 2020
Revenue [abstract]  
REVENUE
7. REVENUE
Revenue includes the following components:
For the Years Ended
December 31,
 20202019
Revenue - Spot sales265,593 194,626 
Cash payment proceeds6,197 4,610 
Deferred revenue recognized8,662 10,220 
Variable consideration adjustment(7,971)(5,636)
Revenue - Streaming Agreement6,888 9,193 
Total revenue272,481 203,820 
Information about major customers
During the year ended December 31, 2020, approximately 90% (year ended December 31, 2019 - 90%) of our gold production was sold through a gold refinery located in South Africa. Except for the sales to RGLD Gold AG as part of the Streaming Agreement, the refinery arranges for the sale of gold typically on the day the gold doré arrives at the refinery and the Company receives payment for the refined gold sold two working days after the gold doré arrives at the refinery (Note 3 Revenue Recognition for a description of the change to the sale of gold doré effective as of March 20, 2020). Previously, the sale of gold completed on the same day the gold was shipped from the mine site.

The global gold market is competitive with numerous banks and gold refineries willing to buy refined gold and gold doré on short notice. Therefore, we believe that the loss of one of our current customers would not materially delay or disrupt revenue.
v3.21.1
COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION
8. COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION
Cost of sales, excluding depreciation and amortization, include the following components:
For the Years Ended
December 31,
 20202019
Contractors8,671 11,133 
Electricity9,427 10,219 
Fuel5,449 5,744 
Raw materials and consumables 22,217 17,702 
Salaries and benefits37,806 33,152 
Maintenance parts and consumables14,714 12,103 
General and administrative overheads7,714 8,023 
Sales-related costs1,402 646 
Mine operating expenses107,400 98,722 
Severance charges45 225 
Operating costs to metal inventory1,918 299 
Inventory write-downs (Note 14)176 — 
Royalties14,883 10,877 
124,422 110,123 
v3.21.1
OTHER EXPENSE, NET
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
OTHER EXPENSE, NET
9. OTHER EXPENSE, NET

Other expense includes the following components:
For the Years Ended December 31,
20202019
Realized loss on non-hedge derivative contracts (Note 24)2,476 — 
Corporate office relocation costs407 7,221 
Loss/(gain) on disposal of assets40 (13)
Other expenses1,926 4,679 
4,849 11,887 
v3.21.1
FINANCE EXPENSE, NET
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
FINANCE EXPENSE, NET
10. FINANCE EXPENSE, NET
Finance expense and income include the following components:
For the Years Ended December 31,
 20202019
Interest expense on principal debt7,106 4,767 
Interest on financing component of deferred revenue (Note 18)3,026 4,288 
Accretion of 7% Convertible Debentures discount (Note 19)
2,733 2,390 
Amortization of deferred financing fees1,020 642 
Net foreign exchange loss/(gain)439 (45)
Accretion of rehabilitation provision (Note 17)155 191 
Gain on modification of Macquarie Credit Facility (Note 19)(2,973)— 
Variable adjustment component (Note 18)(1,534)(6,189)
Accretion of long-term receivables discount (Note 13)(220)— 
Interest income(289)(1,429)
9,463 4,615 
On October 17, 2019, the Company closed a $60 million senior secured credit facility with Macquarie Bank Limited (“Macquarie”) (the Credit Facility") as further discussed in Note 19. The Company used the proceeds from the group-held Macquarie Credit Facility to repay site-level financing arrangements. Interest expense on principal debt held by Prestea and included in loss on discontinued operations for the year ended December 31, 2019 amounted to $2.7 million (Note 5).
v3.21.1
INCOME TAXES
12 Months Ended
Dec. 31, 2020
Incomes Taxes [Abstract]  
INCOME TAXES
11. INCOME TAXES
We recognize deferred tax assets and liabilities based on the difference between the financial reporting and tax basis of assets and liabilities using the tax rates enacted or substantively enacted when the temporary differences are expected to reverse. Deferred tax assets are fully recognized when we conclude sufficient positive evidence exists to demonstrate that it is probable that a deferred tax asset will be realized. These factors included, but are not limited to, (a) historic and expected future levels of taxable income; (b) tax plans that affect whether tax assets can be realized; and (c) the nature, amount and expected timing of reversal of taxable temporary differences. Levels of future income are affected by market price of gold, forecast future costs of production and quantities of proven and probable gold reserves.  If these factors or other circumstances changes, the Company records an adjustment to the recognition of deferred tax asset to reflect the Company’s latest assessment of the amount of deferred tax asset that is probable to be realized.
Our net deferred tax liabilities at December 31, 2020 and 2019 include the following components:
December 31,
2020
December 31,
2019
Deferred tax assets  
Deductible temporary differences relating to provisions5,608 4,672 
Deferred tax liabilities
Mine property costs36,706 25,226 
Net deferred tax liabilities31,098 20,554 
The composition of our unrecognized deferred tax assets by tax jurisdiction is summarized as follows:
 December 31,
2020
December 31,
2019
Deductible temporary differences
Canada4,521 7,006 
Ghana824 1,859 
5,345 8,865 
Tax losses
Canada67,818 60,195 
Other2,396 334 
70,214 60,529 
Total unrecognized deferred tax assets
Canada72,339 67,201 
Ghana824 1,859 
Other2,396 334 
75,559 69,394 
At December 31, 2020, the Company had a tax pool of $43.7 million which has no expiry date and loss carryovers of $246.7 million which expires between 2026 and 2040.
The income tax expense includes the following components:
For the years ended
December 31,
 20202019
Current tax expense
Current tax on net earnings36,748 6,291 
Adjustments in respect to prior year973 — 
37,721 6,291 
Deferred tax expense
Originating and reversal of temporary differences in the current year10,545 21,148 
Income tax expense48,266 27,439 
During the current year, current income taxes amounting to $25.8 million (2019 - $5.5 million) was paid and a further $13.2 million was paid subsequent to the financial year in relation to the Q4 2020 period.
A reconciliation of expected income tax on net loss before minority interest at statutory rates with the actual income tax expense is as follows:  
 For the Years Ended
December 31,
 20202019
Income from continuing operations before tax86,41937,427
Statutory tax rate26.5 %26.5 %
Tax benefit at statutory rate22,9019,918
Foreign tax rates17,2387,252
Permanent differences4511,880
Change in unrecognized deferred tax assets due to exchange rates(1,209)(2,424)
Change in unrecognized deferred tax assets8,88510,813
Income tax expense48,26627,439
 
In 2019, the Ghana Revenue Authority (“GRA”) issued a tax assessment to Golden Star (Wassa) Limited, relating to the 2014-2016 periods that claimed a reduction in the attributable tax losses by $29 million which following our appeal was reduced to $4 million during the course of 2020. Management still believes that the majority of the matters noted in the updated assessment are either incorrect or unsubstantiated and has filed a second appeal in an attempt to resolve these matters.
Subsequent to the financial year ended December 31 2020, the GRA issued a tax assessment to Golden Star (Wassa) Limited, relating to the 2017-2018 periods that claimed a reduction in the attributable tax losses by $4 million. Management believes that the majority of the matters in the assessment are either incorrect or unsubstantiated and has filed an appeal in an attempt to resolve these matters.
As Golden Star (Wassa) Limited utilized all its tax loss carry forwards in the year ending December 31, 2019, if the above audit assessments were to be upheld there would be a cash tax exposure of approximately $3 million.
Overall, it is the Company’s current assessment that the relevant assessments and claims by the GRA are in most cases unsubstantiated and without merit. No amounts have been recorded for any potential liability associated with the above amounts and the Company intends to defend any follow up in relation to this matter should it arise. The amount of loss, if any, cannot be determined at the current time.
v3.21.1
INCOME/(LOSS) PER COMMON SHARE
12 Months Ended
Dec. 31, 2020
Earnings per share [abstract]  
INCOME/(LOSS) PER COMMON SHARE
12. INCOME/(LOSS) PER COMMON SHARE
The following table provides a reconciliation between basic and diluted loss per common share:
For the Years Ended
December 31,
 20202019
Net income/(loss) attributable to Golden Star shareholders used in calculating basic income/(loss) per share:
From continuing operations38,518 5,317 
From discontinued operations (Note 5)(90,658)(72,751)
(52,140)(67,434)
Diluted income/(loss)
Net income from continuing operations attributable to Golden Star shareholders:
Used in calculating basic income/(loss) per share38,518 5,317 
Adjustments:
Interest expense on 7% Convertible Debentures
3,615 — 
Accretion of 7% Convertible Debentures discount (Note 10)
2,733 — 
Gain on fair value of 7% Convertible Debentures embedded derivative (Note 24)
(2,965)— 
Used in calculating diluted income/(loss) per share41,901 5,317 
Net loss from discontinued operations attributable to Golden Star Shareholders(90,658)(72,751)
Loss attributable to Golden Star shareholders used in calculating diluted income/(loss) per share(48,757)(67,434)
Weighted average number of basic shares (millions)110.3 109.0 
Dilutive securities:
Options0.1 0.8 
Deferred share units1.3 1.2 
Performance and restricted share units0.4 1.0 
UK performance share units1.3 — 
7% Convertible Debentures11.4 — 
Weighted average number of diluted shares (millions)124.8 112.0 
Basic income/(loss) per share
From continuing operations$0.35 $0.05 
From discontinued operations$(0.82)$(0.67)
Basic loss per share attributable to Golden Star shareholders$(0.47)$(0.62)
Diluted income/(loss) per share
From continuing operations$0.34 $0.05 
From discontinued operations$(0.82)$(0.67)
Diluted loss per share attributable to Golden Star shareholders$(0.47)$(0.62)
v3.21.1
ACCOUNTS AND OTHER RECEIVABLES
12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
ACCOUNTS AND OTHER RECEIVABLES
13. ACCOUNTS AND OTHER RECEIVABLES
The following table summarizes the components of the Company's current and long-term accounts receivables:
As ofAs of
December 31,
2020
December 31, 2019
Current:
Deferred consideration for the sale of Prestea (Note 5)19,297 — 
Gold sales receivable174 1,206 
Indirect taxes1,579 3,649 
Other2,710 1,648 
23,759 6,503 
Long-term:
Deferred consideration for the sale of Prestea (Note 5)12,602 — 
12,602 — 
As discussed in Note 5, the Company completed the sale of Prestea to FGR for a deferred consideration which is guaranteed by BIH. The current portion of the receivable from FGR includes the $5 million payable no later than March 30, 2021, the $10 million payable on July 31, 2021 and a net working capital adjusted balancing payment of approximately $4.3 million, also payable on July 31, 2021. Management has calculated the net working capital adjusted balancing payment of the deferred consideration in accordance with the terms of the SPA and is not expecting any material adjustments to the balance. During the year ended December 31, 2020, the Company recognized interest on the non-current portion of the receivable $0.2 million (Note 10).
v3.21.1
INVENTORIES
12 Months Ended
Dec. 31, 2020
Classes of current inventories [abstract]  
INVENTORIES
14. INVENTORIES
Inventories include the following components, net of provisions:
As ofAs of
December 31,
2020
December 31,
2019
Stockpiled ore6,706 7,578 
In-process ore1,057 2,721 
Finished goods449 394 
Materials and supplies22,388 28,167 
30,600 38,860 
The cost of inventories expensed for the year ended December 31, 2020 was $109.5 million (year ended December 31, 2019 - $99.2 million).
Write-downs of materials and supplies of $0.2 million were recorded for the year ended December 31, 2020 (year ended December 31, 2019 - $nil) (Note 8).
The finished goods inventory as of December 31, 2020 of $0.4 million is carried at net realizable value.
v3.21.1
MINING INTERESTS
12 Months Ended
Dec. 31, 2020
Property, plant and equipment [abstract]  
MINING INTERESTS
15. MINING INTERESTS
The following table shows the breakdown of the cost, accumulated depreciation and net book value of plant and equipment, mining properties and construction in progress:
Plant and equipmentMining propertiesConstruction in progressTotal
Cost
As of December 31, 2018478,760 930,230 28,569 1,437,559 
Additions238 288 72,615 73,141 
Right of use asset additions2,631 — — 2,631 
Transfers11,586 71,337 (82,923)— 
Change in rehabilitation provision estimate— 4,830 — 4,830 
Disposals and other(621)— — (621)
Balance at December 31, 2019492,594 1,006,685 18,261 1,517,540 
Additions69 — 52,151 52,220 
Right of use asset additions599 — — 599 
Transfers22,526 39,602 (62,128)— 
Change in rehabilitation provision estimate— 2,215 — 2,215 
Derecognized on sale of Prestea (Note 5)(226,396)(244,612)(4,598)(475,606)
Disposals and other(301)— — (301)
Balance at December 31, 2020289,091 803,890 3,686 1,096,667 
Accumulated depreciation
As of December 31, 2018432,799 734,120 — 1,166,919 
Depreciation and amortization10,582 19,044 — 29,626 
Disposals and other(456)— — (456)
Impairment charges7,338 49,424 — 56,762 
Balance at December 31, 2019450,263 802,588 — 1,252,851 
Depreciation and amortization11,986 17,596 — 29,582 
Derecognized on sale of Prestea (Note 5)(210,594)(182,364)— (392,958)
Disposals and other(220)— — (220)
Balance at December 31, 2020251,435 637,820 — 889,255 
Carrying amount
Balance at December 31, 201942,331 204,097 18,261 264,689 
Balance at December 31, 202037,656 166,070 3,686 207,412 
Additions to mining interests are presented inclusive of discontinued operations, whereas additions per the consolidated statement of cash flows and the segment information (Note 6) are presented excluding discontinued operations. The following table presents the split of additions:
Year ended December 31, 2020Year ended December 31, 2019
Continuing operations45,224 60,123 
Discontinued operations6,996 13,018 
52,220 73,141 

As at December 31, 2020, the right-of-use assets had net carrying amounts of $2.7 million (December 31, 2019 - $3.3 million). The total minimum lease payments are disclosed in Note 19 - Debt.
v3.21.1
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
12 Months Ended
Dec. 31, 2020
Trade and other current payables [abstract]  
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
16. ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
Accounts payable and accrued liabilities include the following components:
As ofAs of
December 31,
2020
December 31,
2019
Trade and other payables20,026 42,232 
Accrued liabilities 14,137 35,921 
Payroll-related liabilities4,917 7,780 
Accrued interest payable2,217 2,435 
41,297 88,368 
See Note 28 for a reclassification of accounts payable and accrued liabilities as of December 31, 2019.
v3.21.1
REHABILITATION PROVISIONS
12 Months Ended
Dec. 31, 2020
Disclosure of other provisions [abstract]  
REHABILITATION PROVISIONS
17. REHABILITATION PROVISIONS
At December 31, 2020, the estimated total undiscounted amount of future cash for rehabilitation of Wassa was estimated to be $17.8 million. A discount rate assumption of 0.3%, an inflation rate assumption of 1.7% and a risk premium of 5% were used to value the rehabilitation provisions as at December 31, 2020. This compares to a discount rate assumption of 2%, an inflation rate assumption of 2% and a risk premium of 5% used as at December 31, 2019. The Company expects the payments for reclamation to be incurred between 2021 and 2027. The changes in the carrying amount of the rehabilitation provisions are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance68,435 66,225 
Accretion of rehabilitation provisions (Note 10)444 730 
Changes in estimates4,188 4,651 
Cost of reclamation work performed(2,632)(3,171)
Derecognized on sale of Prestea (Note 5)(52,867)— 
Balance at the end of the period17,568 68,435 
Current portion2,018 5,826 
Long term portion15,550 62,609 
17,568 68,435 
For the year ended December 31, 2020, the accretion of the rehabilitation provision for Prestea of $0.2 million was included in the net loss for discontinued operations (Note 5) and the accretion of the rehabilitation provision for Wassa of $0.2 million was included in finance expenses (Note 10). The cost of reclamation work performed for Prestea for the year ended December 31, 2020 of $1.4 million (2019 - $1.9 million) was included within net cash used in operating activities of discontinued operations. The remaining cost of reclamation work for the year ended December 31, 2020 of $1.2 million (2019 - $1.2 million) pertains to work performed for Wassa and is included within net cash provided by operating activities of continuing operations.
Changes in estimates for the year ended December 31, 2020 comprised $0.9 million of charges relating to Wassa (2019 - $1.6 million) and $3.3 million relating to Prestea up until the point of sale (2019 - $3.1 million). Changes in estimates of $2.0 million (2019 - ($0.2 million)) relates to discontinued refractory operations at Prestea and is included in Other expenses within net loss from discontinued operations in the consolidated statement of operations (Note 5). The remaining change in estimates of $2.2 million (2019 - $4.8 million) relating to non-refractory operations is included with mining interests (Note 15).
v3.21.1
DEFERRED REVENUE
12 Months Ended
Dec. 31, 2020
Disclosure Of Deferred Revenue [Abstract]  
DEFERRED REVENUE
18. DEFERRED REVENUE
In May 2015, the Company through its subsidiary Caystar Finance Co. completed a $145 million gold purchase and sale agreement (“Streaming Agreement”) with RGLD Gold AG which provides that Golden Star will deliver 10.5% of gold production from Wassa and Prestea at a cash purchase price of 20% of spot gold until 240,000 ounces have been delivered. Thereafter, 5.5% of gold production will be delivered from Wassa and Prestea at a cash purchase price of 30% of spot gold
price. As at December 31, 2020 the Company had delivered a total of 119,997 ounces of gold to RGLD Gold AG since the inception of the Streaming Agreement.
Following the sale of Prestea and as discussed in Note 5, the Streaming Agreement has been restructured to separate Prestea from the current arrangement. Wassa will now deliver the remainder of the Tier One streaming obligation and thereafter Wassa will transition into the Tier Two structure, which delivers 5.5% of gold production at a cash purchase price of 30% of spot gold price.
The changes in the carrying value of deferred revenue are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance113,975 119,948 
Deferred revenue recognized before cumulative catch-up adjustment(9,804)(13,334)
Variable consideration adjustment6,437 3,073 
Interest on financing component of deferred revenue (Note 10)3,026 4,288 
Derecognized on sale of Prestea (Note 5)(9,072)— 
Balance at the end of the period104,562 113,975 
Current portion7,646 11,191 
Long term portion96,916 102,784 
Total104,562 113,975 
During the year ended December 31, 2020, the Company sold 19,816 (2019 - 21,720) ounces of gold to RGLD Gold AG. Revenue recognized on the ounces sold from Wassa production to RGLD Gold AG during the year ended December 31, 2020 consisted of $6.2 million (2019 - $4.6 million) of cash payment proceeds and $8.7 million (2019 - $10.2 million) of deferred revenue recognized (Note 7). Revenue recognized on the ounces sold from Prestea production to RGLD Gold AG during the year ended December 31, 2020 and recognized in Discontinued operations (Note 5) consisted of $0.8 million (2019 - $1.4 million) of cash payments proceeds and $1.1 million of deferred revenue recognized (2019 - $3.1 million).
As the Company's Streaming Agreement contains a variable component, each time there is a significant change in the underlying gold production of the Company's mines a cumulative catch-up adjustment to revenue is required. In 2020, the Company realized an adjustment to revenue and finance costs due to an increase in the Company's mineral resource and reserve estimates related to Wassa as reflected in the latest life of mine plans. The result of the adjustment was to reduce revenue by $8.0 million (2019 - $9.3 million of which $3.7 million has been allocated to discontinued operations), reduce finance expense by $1.5 million (2019 - $6.2 million) and increase deferred revenue by $6.4 million (2019 - $3.1 million).
v3.21.1
DEBT
12 Months Ended
Dec. 31, 2020
Disclosure of detailed information about borrowings [abstract]  
DEBT
19. DEBT
The following table summarizes the components of the Company's current and long-term debt:
As ofAs of
December 31,
2020
December 31, 2019
Current debt:
Lease liabilities296 987 
7% Convertible Debentures
49,735 — 
Macquarie Credit Facility— 15,000 
50,031 15,987 
Long-term debt:
Lease liabilities1,185 1,394 
7% Convertible Debentures
— 47,002 
Macquarie Credit Facility54,547 42,386 
55,732 90,782 
Lease liabilities

Lease liabilities as at December 31, 2020 include equipment lease agreements totaling $0.1 million (2019 - $0.6 million) and a corporate office lease of $1.4 million (2019 - $1.8 million) which has a remaining lease term of five years. Short-term lease payments for the period ended December 31, 2020 were $1.7 million (2019 - $1.4 million).

Macquarie Credit Facility

On October 17, 2019, the Company closed the $60 million senior secured Macquarie Credit Facility. The interest rate is 4.5% plus the applicable USD LIBOR rate. Certain subsidiaries of the Company are guarantors under the Macquarie Credit Facility, namely, Caystar Holdings, Wasford Holdings, Golden Star (Wassa) Limited, and Caystar Finance Co.

On October 9, 2020, the Company entered into a modified and restated credit agreement with Macquarie pursuant to which Macquarie upsized the credit facility to $70 million representing a $20 million increase on the outstanding balance of $50 million. This allowed the Company to re-draw the two $5 million principal repayments that were made in June and September 2020 and provided an additional $10 million of new capacity which will be made available in conjunction with the redemption of the 7% Convertible Debentures maturing in August 2021.

The modification of the Macquarie Credit Facility included a rescheduled amortization profile which defers quarterly repayments of $5 million per quarter to March 2022. The quarterly principal repayments will continue to December 2023 when the remaining balance of the Macquarie Credit Facility will be settled by a $25 million bullet payment. Should the Company elect to draw the additional $10 million at the time it becomes available, the next quarterly principal repayment will be brought forward to September 2021.

The modification of the Macquarie Credit Facility resulted in a gain on modification of $3.0 million and is reflected in Finance expense, net (Note 10).

The Macquarie Credit Facility includes covenant clauses requiring the Company to maintain certain key financial ratios. There were no changes to the covenant clauses as a result of the modification, refer to note 25.

7% Convertible Debentures

The 7% Convertible Debentures were issued on August 3, 2016, in the amount of $65.0 million due August 15, 2021. The Company entered into exchange and purchase agreements with two holders of its 5% Convertible Debentures due June 1, 2017 to exchange $42.0 million principal amount of the outstanding 5% Convertible Debentures for an equal principal amount of 7% Convertible Debentures (the "Exchange"), with such principal amount being included in the issuance of the $65.0 million total aggregate principal amount of the 7% Convertible Debentures. The Company did not receive any cash proceeds from the Exchange. The 7% Convertible Debentures are governed by the terms of an indenture dated August 3, 2016, by and between the Company and The Bank of New York Mellon, as indenture trustee.

The 7% Convertible Debentures are senior unsecured obligations of the Company, bear interest at a rate of 7.0% per annum, payable semi-annually on February 1 and August 1 of each year, beginning on February 1, 2017, and will mature on August 15, 2021, unless earlier repurchased, redeemed or converted. Subject to earlier redemption or purchase, the 7% Convertible Debentures are convertible at any time until the close of business on the third business day immediately preceding August 15, 2021 at the option of the holder, and may be settled, at the Company's election, in cash, common shares of the Company, or a combination of cash and common shares based on an initial conversion rate. The initial conversion rate of the 7% Convertible Debentures, subject to adjustment, is approximately 222 common shares of the Company per $1,000 principal amount of 7% Convertible Debentures being converted, which is equivalent to an initial conversion price of approximately $4.50 per common share. The initial conversion rate is subject to adjustment upon the occurrence of certain events. 
Prior to August 15, 2019, the Company could not redeem the 7% Convertible Debentures except in the event of certain changes in applicable tax law. On or after August 15, 2019, the Company may redeem all or part of the outstanding 7% Convertible Debentures at the redemption price, only if the last reported sales price of the Company's common shares for 20 or more trading days in a period of 30 consecutive trading days ending on the trading day prior to the date the Company provides the notice of redemption to holders exceeds 130% of the conversion price in effect on each such trading day. The redemption price is equal to the sum of (i) 100% of the principal amount of the 7% Convertible Debentures to be redeemed, (ii) any accrued and unpaid interest to, but excluding, the redemption date, and (iii) a redemption make-whole payment, payable in cash, common shares of the Company or a combination thereof, at the Company's election, equal to the present value of the remaining scheduled payments of interest that would have been made on the 7% Convertible Debentures to be redeemed had such debentures
remained outstanding from the redemption date to August 15, 2021 (excluding interest accrued to, but excluding, the redemption date, which is otherwise paid pursuant to the preceding clause (ii)).
The conversion feature referred to above is an embedded derivative. The Company selected to bifurcate the conversion feature from the host instrument, thereby separating it from the debt component. The debt component is recorded at amortized cost and the embedded derivative is accounted for at fair value. At December 31, 2020, the fair value of the embedded derivative was $2.6 million (December 31, 2019 - $5.6 million). The revaluation gain of $3.0 million is recorded in the consolidated statement of operations (year ended December 31, 2019 - revaluation loss of $1.4 million).
There were no conversions of the 7% Convertible Debentures during the years ended December 31, 2020 and 2019. As at December 31, 2020, $51.5 million principal amount of 7% Convertible Debentures remains outstanding.
The changes in the carrying amount of the 7% Convertible Debentures are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance47,002 44,612 
Accretion of 7% Convertible Debentures discount (Note 10)
2,733 2,390 
Balance at the end of the period49,735 47,002 

Schedule of payments on outstanding debt as of December 31, 2020:
Year ending December 31, 2021Year ending December 31, 2022Year ending December 31, 2023Year ending December 31, 2024Year ending December 31, 2025Maturity
Lease liabilities
Principal297 303 303 323 255 2025
Interest81 62 43 24 
7% Convertible Debentures
Principal51,498 — — — — 2021
Interest3,605 — — — — 
Macquarie Credit Facility
Principal— 20,000 40,000 — — 2023
Interest2,831 2,595 1,936 — — 
Total principal51,795 20,303 40,303 323 255 
Total interest6,517 2,657 1,979 24 
58,312 22,960 42,282 347 259 
v3.21.1
SHARE CAPITAL
12 Months Ended
Dec. 31, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]  
SHARE CAPITAL
20. SHARE CAPITAL
Number of Common SharesShare Capital
Balance at December 31, 2018108,819,009 908,035 
Issued on exercise of DSUs437,772 2,054 
Issued on exercise of stock options128,282 116 
Balance at December 31, 2019109,385,063 910,205 
Issued on exercise of DSUs135,557 176 
Issued on exercise of stock options1,711,680 7,376 
Issued on settlement of PRSUs, net of tax81,295 256 
Balance at December 31, 2020111,313,595 918,013 
On October 28, 2020, the Company entered into a $50 million “at the market” sales agreement. The use of proceeds from the “at the market” sales agreement is for discretionary growth capital at Wassa, exploration, general corporate purposes and working capital. As at February 24, 2021, no shares of common stock had been sold under the "at the market" sales agreement.
v3.21.1
SHARE-BASED COMPENSATION
12 Months Ended
Dec. 31, 2020
Share-Based Payment Arrangements [Abstract]  
SHARE-BASED COMPENSATION
21. SHARE-BASED COMPENSATION
Share-based compensation expenses recognized in the consolidated statements of operations include the following components:
For the Years Ended December 31,
 20202019
Stock options438 1,890 
Deferred share units518 689 
Share appreciation rights35 (52)
Performance and restricted share units394 592 
UK performance share units1,610 — 
2,995 3,119 
Stock options
Under the Fourth Amended and Restated 1997 Stock Option Plan (the "Stock Option Plan"), the Company may grant stock options to employees, consultants and directors of the Company or its subsidiaries of up to 7,000,000 shares. Stock options granted are non-assignable and are exercisable for a period of 10 years or such other period as is stipulated in a stock option agreement between Golden Star and the optionee.

The exercise price of each option is not less than the closing price of our shares on the Toronto Stock Exchange on the day prior to the date of grant. Stock options typically vest over periods ranging from immediately to four years from the date of grant. Vesting periods are determined at the discretion of the Compensation Committee.
As of February 22, 2020, the Company no longer grants stock options under the existing Stock Option Plan.

The fair value of option grants is estimated at the grant dates using the Black-Scholes option-pricing model. Fair values of stock options granted during the year ended December 31, 2020 and 2019 were based on the weighted average assumptions noted in the following table:
For the Years Ended
December 31,
 20202019
Expected volatility56.69%51.20%
Risk-free interest rate1.41%1.73%
Expected lives1.1 years5.7 years
The weighted average fair value per stock option granted during the year ended December 31, 2020 was $0.96 CAD (year ended December 31, 2019 - $2.55 CAD). As at December 31, 2020, there was $0.1 million of share-based compensation expense (December 31, 2019 - $0.5 million) relating to the Company's stock options to be recorded in future periods. For the
year ended December 31, 2020, the Company recognized an expense of $0.4 million (year ended December 31, 2019 - $1.9 million). 
A summary of stock option activity under the Company's Stock Option Plan during the year ended December 31, 2020 is as follows: 
Options




('000)
Weighted–
average
exercise
price

(CAD$)
Weighted–
average
remaining
contractual
life 
(Years)
Outstanding as of December 31, 20183,498 5.28 6.3
Granted806 5.21 9.2
Exercised(438)3.82 7.3
Forfeited(35)5.49 7.7
Expired(55)8.50 0
Outstanding as of December 31, 20193,776 5.39 4.7
Granted57 3.99 9.2
Exercised(1,712)3.68 6.0
Forfeited(574)6.03 4.0
Expired(698)7.94 0
Outstanding as of December 31, 2020849 6.21 5.3
Exercisable as of December 31, 20193,320 5.41 4.1
Exercisable as of December 31, 2020711 6.40 4.7

The number of stock options outstanding by strike price as of December 31, 2020 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2020Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2020Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
3.51 to 4.50
137 3.14.31 131 4.32 
4.51 to 5.50
432 7.75.14 306 5.09 
5.51 to 7.50
116 4.26.41 110 6.46 
7.51 to 10.50
121 1.89.36 121 9.36 
10.51 to 14.15
43 0.313.59 43 13.59 
849 5.36.21 711 6.40 
The number of stock options outstanding by strike price as of December 31, 2019 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2019Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2019Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
1.50 to 2.50
581 3.71.90 581 1.90 
2.51 to 3.50
373 5.72.82 373 2.82 
3.51 to 4.50
605 3.04.34 588 4.35 
4.51 to 5.50
1,187 7.35.03 782 4.96 
5.51 to 7.50
482 4.66.46 448 6.47 
7.51 to 10.50
322 2.09.67 322 9.67 
10.51 to 17.65
226 0.614.92 226 14.92 
3,776 4.75.39 3,320 5.41 

Deferred share units ("DSUs")
The Company's Deferred Share Unit Plan (the “DSU Plan”) was adopted on March 9, 2011 and was amended and restated as of March 14, 2016 (the “Restatement Effective Date”). Pursuant to the DSU Plan, directors may elect to receive all or part of their retainer fee in DSUs having a market value equal to the portion of the retainer to be received in that form, subject to such limits as the Compensation Committee may impose. The Compensation Committee may also grant to any director or executive officer, in each year, DSUs having a market value not greater than the total compensation payable to such director or executive officer for that year, including any salary or bonus but excluding any director’s retainer. The number of DSUs to be issued is determined by dividing the amount of the retainer or base salary determined as the basis for the award by the volume-weighted average trading price of a Common Share (as reported by the NYSE American) for the 20 trading days immediately preceding the date the DSUs are awarded. The vesting schedule of the DSUs is determined at the discretion of the Compensation Committee, but generally in the case of DSUs granted to directors in lieu of director retainers, the DSUs vest immediately on the award date. DSUs otherwise awarded to directors and officers as part of total compensation payable generally vest one-third on each of the first three anniversaries of the award date.
At the election of the Compensation Committee in its sole discretion, each DSU granted after the Restatement Effective Date may be redeemed for: (a) cash payment equal to the market value of one Common Share on the date of redemption (the “Redemption Value”), after deduction of applicable taxes and other source deductions required by applicable laws; (b) such number of common shares purchased by the Company on the public market as having an aggregate market value equal to the Redemption Value; or (c) any combination of the foregoing, so long as the aggregate redemption price has a fair market value equal to the Redemption Value. In addition to the foregoing, the Compensation Committee in its sole discretion, may redeem DSUs granted prior to the Restatement Effective Date for common shares issued by the Company from treasury.
For the year ended December 31, 2020, the DSUs that were granted vested immediately and a compensation expense of $0.5 million was recognized for these grants (year ended December 31, 2019 - $0.7 million). As of December 31, 2020, there was no unrecognized compensation expense related to DSUs granted under the Company's DSU Plan.
The DSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of DSUs, beginning of period ('000)1,274 1,086 
Granted214 188 
Exercised(136)— 
Forfeited(30)— 
Number of DSUs, end of period ('000)1,322 1,274 
Share appreciation rights ("SARs")
On February 13, 2012, the Company adopted a Share Appreciation Rights ("SARs") Plan. The plan allows SARs to be issued to executives, employees and directors that vest after a period of three years. These awards are settled in cash on the exercise date
equal to the Company's stock price less the strike price. Since these awards are settled in cash, the Company marks-to-market the associated expense for each award at the end of each reporting period using a Black-Scholes model. The Company accounts for these as liability awards and marks-to-market the fair value of the award until final settlement. 
As of December 31, 2020, there was approximately $0.1 million of total unrecognized compensation cost related to unvested SARs (December 31, 2019 - $0.1 million). For the year ended December 31, 2020, the Company recognized $0.04 million expense related to these cash-settled awards (year ended December 31, 2019 - credit of $0.05 million).
The SARs activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of SARs, beginning of period ('000)593 674 
Granted240 285 
Exercised(225)(203)
Forfeited(57)(160)
Expired(113)(3)
Number of SARs, end of period ('000)438 593 
2017 Performance and restricted share units ("PRSUs")
On May 4, 2017, the Company adopted a 2017 performance and restricted share unit plan (the "2017 PRSU Plan"). Pursuant to the 2017 PRSU Plan, performance share units ("2017 PSUs") and restricted share units ("2017 RSUs" and, together with the 2017 PSUs, the "Share Units") may be issued to any employee or officer of the Company or its designated affiliates. Share Units may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market; (iii) a cash payment; or (iv) a combination of (i), (ii) and (iii). Under the 2017 PRSU plan, the Company may grant up to a maximum of 2,200,000 common shares. As at December 31, 2020, 1,242,155 share units were available for grant.

Each PRSU represents one notional common share that is redeemed for common shares or common shares plus cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PRSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of Share Units by the performance adjustment factor, which ranges from 0% to 200%. The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the 2017 PRSU Plan. As the Company has a practice of settling these awards in common shares, they are accounted for as equity awards with corresponding compensation expense recognized.

For the year ended December 31, 2020, the Company recognized $0.4 million expense (year ended December 31, 2019 - $0.6 million). The PRSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of PRSUs, beginning of period ('000)634 791 
Granted— 561 
Settled(95)(324)
Forfeited(329)(394)
Number of PRSUs, end of period ('000)210 634 

Performance share units ("PSUs")

On January 1, 2014, the Company adopted a Performance Share Unit ("PSU") Plan.  Each PSU represented one notional common share that was redeemed for cash based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria had been met.  The PSUs vested at the end of a three-year performance period. The cash award was determined by multiplying the number of units by the performance adjustment factor, which ranged from 0% to 200%. The performance adjustment factor was determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the PSU Plan. As the Company was required to settle these awards in cash, they were accounted for as liability awards with corresponding compensation expense recognized.
The final PSU grant vested on December 31, 2018 and, as a result, the Company did not recognize a PSU expense in 2019 or 2020. As of December 31, 2019 there is no longer a PSU liability recognized on the consolidated balance sheet.

A summary of the PSU activity during the year ended December 31, 2020 and 2019:
For the Years Ended December 31,
20202019
Number of PSUs, beginning of period ('000)— 1,173 
Settled— (1,173)
Number of PSUs, end of period ('000)— — 

UK performance share units

In February 2020, the Company adopted a new UK Performance Share Unit ("UK PSU") Plan which was approved by the shareholders of the Company in May 2020. Pursuant to the UK PSU Plan, performance share units may be issued to any employee or officer of the Company or its designated affiliates. UK PSUs may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market; (iii) a cash payment; or (iv) a combination of (i), (ii) and (iii). Under the UK PSU Plan, there are 4,568,506 share units available for grant as at December 31, 2020.

Each UK PSU represents one notional common share that is redeemed for common shares or common shares plus cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The UK PSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of UK PSUs by the performance adjustment factor, which ranges from 0% to 200%. The performance adjustment factor is determined by comparing the Company's total shareholder return performance to the total shareholder return performance of a peer group of companies as determined by the Compensation Committee. The Company expects to settle these awards in common shares so they are accounted for as equity awards with corresponding compensation expense recognized.

For the year ended December 31, 2020, the Company recognized $1.6 million expense (year ended December 31, 2019 -$nil).

The UK PSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of UK PSUs, beginning of period ('000)— — 
Granted1,555 — 
Settled— — 
Forfeited— — 
Number of UK PSUs, end of period ('000)1,555 — 
v3.21.1
RELATED PARTY TRANSACTIONS
12 Months Ended
Dec. 31, 2020
Related Party [Abstract]  
RELATED PARTY TRANSACTIONS
22. RELATED PARTY TRANSACTIONS
There were no material related party transactions for the years ended December 31, 2020 and 2019 other than the items disclosed below.
Key management personnel
Key management personnel are defined as members of the Board of Directors and certain senior officers of the Company. Compensation of key management personnel is as follows:
For the Years Ended
December 31,
 20202019
Salaries, wages, and other benefits4,282 5,469 
Bonuses1,895 1,947 
Share-based compensation2,313 2,547 
8,490 9,963 
v3.21.1
PRINCIPAL SUBSIDIARY INFORMATION
12 Months Ended
Dec. 31, 2020
Interests In Other Entities [Abstract]  
PRINCIPAL SUBSIDIARY INFORMATION
23. PRINCIPAL SUBSIDIARY INFORMATION
The consolidated financial statements include the accounts of the Company and all of its subsidiaries at December 31, 2020. The principal operating subsidiary is Wassa at December 31, 2020 and until September 30, 2020, Wassa and Prestea. The Company has a 90% ownership interest in Wassa and had a 90% ownership in Prestea until September 30, 2020.
Set out below is summarized financial information for each subsidiary that has non-controlling interests that are material to the group. The amounts are disclosed on a 100% basis and disclosure for each subsidiary are based on those included in the consolidated financial statements before inter-company eliminations.
Summarized statement of financial position
WassaPrestea
As of December 31,As of December 31,
2020201920202019
Non-controlling interest percentage10 %10 %10 %10 %
Current assets77,835 142,603 — 14,623 
Current liabilities116,469 163,640 — 1,267,815 
(38,634)(21,037)— (1,253,192)
Non-current assets206,950 182,982 — 79,788 
Non-current liabilities46,648 37,327 — 45,871 
160,302 145,655 — 33,917 
Net assets/(liabilities)121,668 124,618 — (1,219,275)
Non-controlling interest19,911 20,275 — (102,788)
Summarized income statement
WassaPrestea
For the Years EndedFor the Periods Ended
December 31, 2020December 31, 2019September 30, 2020December 31, 2019
Revenue297,468 216,678 37,959 66,820 
Net (loss)/income and comprehensive (loss)/income(3,654)46,691 342,238 (152,106)
The net loss for the year ended December 31, 2020 for Wassa includes the write-off of intercompany loan receivables from Prestea of $93.7 million agreed as part of the sale of Prestea. Concurrently, the net income for the period ended September 30, 2020 for Prestea includes the forgiveness of intercompany loans payable to Golden Star and its subsidiaries of $390.6 million agreed as part of the sale of Prestea.
Summarized cash flows
WassaPrestea
For the Years EndedFor the Periods Ended
December 31, 2020December 31, 2019September 30, 2020December 31, 2019
Cash flows provided by/(used in) operating activities132,659 78,809 (17,738)(88,883)
Cash flows used in investing activities(47,258)(49,622)(5,785)(10,685)
Cash flows (used in)/provided by financing activities(55,516)(26,993)23,314 98,994 
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS
12 Months Ended
Dec. 31, 2020
Financial Instruments [Abstract]  
DEIVATIVE FINANCIAL INSTRUMENTS
24. DERIVATIVE FINANCIAL INSTRUMENTS
The following table illustrates the classification of the Company's recurring fair value measurements for derivative financial instruments within the fair value hierarchy and their carrying values and fair values as at December 31, 2020 and December 31, 2019:
December 31, 2020December 31, 2019
 LevelCarrying valueFair valueCarrying valueFair value
Financial liabilities
Fair value through profit or loss
7% Convertible Debentures embedded derivative (Note 19)
32,643 2,643 5,608 5,608 
Non-hedge derivative contracts22,382 2,382 211 211 
5,025 5,025 5,819 5,819 
There were no non-recurring fair value measurements of derivative financial instruments as at December 31, 2020.
The three levels of the fair value hierarchy are:
    Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities;
    Level 2 - Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly; and
    Level 3 - Inputs that are not based on observable market data.
The following table provides a reconciliation of derivative liability opening and closing balances as presented on the consolidated balance sheets:
For the Years Ended
December 31,
 20202019
Opening balance5,819 4,177 
(Gain)/loss on fair value of 7% Convertible Debentures embedded derivative(2,965)1,431 
Unrealized loss on fair value of non-hedge derivative contracts2,171 211 
(Gain)/loss on fair value of derivative financial instruments(794)1,642 
Closing balance5,025 5,819 
Current portion of derivative liability:
7% Convertible Debentures embedded derivative
2,643 — 
Non-hedge derivative contracts669 211 
3,312 211 
Long term portion of derivative liability:
7% Convertible Debentures embedded derivative— 5,608 
Non-hedge derivative contracts1,713 — 
1,713 5,608 
The valuation techniques that are used to measure fair value are as follows:
7% Convertible Debentures embedded derivative
The debt component of the 7% Convertible Debentures is recorded at amortized cost using the effective interest rate method and the conversion feature is classified as an embedded derivative measured at fair value through profit or loss.
The embedded derivative was valued at December 31, 2020 and December 31, 2019 using a convertible note valuation model. The significant inputs used in the convertible note valuation are as follows:
 December 31, 2020December 31, 2019
Embedded derivative
Risk premium5.9 %5.3 %
Borrowing costs7.5 %7.5 %
Expected volatility45.0 %45.0 %
Remaining life (years)0.61.6
If the risk premium increases by 10%, the fair value of the 7% Convertible Debentures embedded derivative would decrease and the related gain in the consolidated statements of operation would increase by $0.01 million at December 31, 2020.
If the borrowing costs increases by 10%, the fair value of the 7% Convertible Debentures embedded derivative would decrease and the related gain in the consolidated statements of operation would increase by $0.04 million at December 31, 2020.
If the expected volatility increases by 10%, the fair value of the 7% Convertible Debentures embedded derivative would increase and the related gain in the consolidated statements of operation would decrease by $0.59 million at December 31, 2020.

Non-hedge derivative contracts
The non-hedge accounted collar contracts are considered fair value through profit or loss financial instruments with fair value determined using pricing models that utilize a variety of observable inputs that are a combination of quoted prices, applicable yield curves and credit spreads.
During the year ended December 31, 2019, the Company entered into costless collars consisting of puts and calls, on 50,000 ounces of gold with a floor price of $1,400 per ounce and a ceiling price of $1,750 per ounce, with maturity dates ranging from October 2019 to September 2020. In February 2020, the Company entered into additional costless collars at a rate of 4,200 ounces per month for the period October 2020 to December 2020 consisting of puts and calls with a floor price of $1,500 per ounce and a ceiling price of $1,992 per ounce. During the year ended December 31, 2020, the Company recognized in relation to these positions realized losses of $2.5 million on call options in excess of the ceiling price of $1,750/oz (refer to Note 9).
In October 2020, the Company entered into additional costless collars consisting of puts and calls on 87,500 ounces with a floor price of $1,600 per ounce and a ceiling price of $2,176 per ounce for positions expiring in 2021, and a ceiling price of $2,188 per ounce for positions expiring in 2022. The additional positions will mature at a rate of 10,937.5 ounces per quarter from
March 2021 to December 2022. During the year ended December 31, 2020, in relation to these positions, the Company recognized an unrealized loss of $2.2 million.

Contingent consideration

The fair value of the contingent consideration on completion of the sale of Prestea and as at December 31, 2020 is $nil.
v3.21.1
FINANCIAL RISK MANAGEMENT
12 Months Ended
Dec. 31, 2020
Disclosure of general information about financial statements [Abstract]  
FINANCIAL RISK MANAGEMENT
25. FINANCIAL RISK MANAGEMENT
Liquidity risk
Liquidity risk is the risk that the Company will encounter difficulty in meeting obligations associated with financial liabilities that are settled by delivering cash or another financial asset. We manage the liquidity risk inherent in these financial obligations by preparing monthly financial summaries, monthly and quarterly forecasts and annual long-term budgets which forecast cash needs and expected cash availability to meet future obligations. Typically, these obligations are met by cash flows from operations and from cash on hand. Scheduling of capital spending and acquisitions of financial resources may also be employed, as needed and as available, to meet the cash demands of our obligations.
Our ability to repay or refinance our future obligations depends on a number of factors, some of which may be beyond our control. Factors that influence our ability to meet these obligations include general global economic conditions, credit and capital market conditions, results of operations, mineral reserves and resources and the price of gold.
The Company's treasury policy specifies that cash is to be held in banks with a rating of A or higher by Moody's Investors Service or Standard & Poor's Financial Services LLC. In addition, the Company's investment policy allows investment of surplus funds in permitted investments consisting of US treasury bills, notes and bonds, government sponsored agency debt obligations, corporate debt or municipal securities with credit rating of at least AA. All investments must have a maximum term to maturity of one year.
Macquarie Credit Facility Financial Covenants
The Macquarie Credit Facility includes covenant clauses requiring the Company to maintain certain key financial ratios. The Company must maintain a Debt Service Coverage Ratio of greater than 1.20:1, tested quarterly on a rolling four-quarter basis as at the end of each of the fiscal quarters beginning with the fiscal quarter ended June 30, 2020; maintain a ratio of Net Debt to EBITDA of less than 3.00:1, tested quarterly on a rolling four-quarter basis as at the end of each of the fiscal quarters; demonstrate, on the basis of the consolidated financial statements and annual consolidated corporate budget, that from December 31, 2020 and for each fiscal quarter thereafter, the Convertible Debentures can be repaid in full in cash by the maturity in August 2021 while maintaining (after giving effect to such repayment in cash) a positive cash position (excluding restricted cash) of $25 million; and ensure that at all times the sum of aggregate indebtedness does not exceed $135 million.
The following table shows our contractual obligations as at December 31, 2020:
 Payment due by period 
 (Stated in thousands of U.S dollars)Less than 1
Year 
1 to 3 years 4 to 5 years  More than
5 Years 
Total 
Accounts payable and accrued liabilities
41,297 — — — 41,297 
Debt1
51,498 60,000 — — 111,498 
Lease liabilities297 606 578 — 1,481 
Interest on debt and lease liabilities6,517 4,636 28 — 11,181 
Current income tax liabilities12,774 — — — 12,774 
Purchase obligations10,109 — — — 10,109 
Rehabilitation provisions2
2,024 10,136 4,778 813 17,751 
Total124,516 75,378 5,384 813 206,091 
1     Includes the outstanding repayment amounts from the 7% Convertible Debentures maturing on August 15, 2021 and the Macquarie Credit Facility.
2    Rehabilitation provisions indicates the expected undiscounted cash flows for each period.
As at December 31, 2020, the Company has current assets of $121.7 million compared to current liabilities of $117.1 million. As at December 31, 2020, the Company had a cash balance of $60.8 million.
The Company expects to meet its short-term financial needs through its cash on hand and cash flow from operations. The Company has an undrawn amount of $10 million on the Macquarie Credit Facility which is available in conjunction with the redemption of the Convertible Debentures maturing in August 2021. Also, the Company entered into a sales agreement relating
to a $50 million “at the market” equity program of which the proceeds can be used for discretionary growth capital, exploration, general corporate purposes and working capital. As at February 24, 2021, no shares of common stock had been sold under the "at the market" sales agreement.

Capital risk
The Company manages its capital in a manner that will allow it to continue as a going concern while maximizing the return to shareholders through the optimization of the debt and equity balance.
In the management of capital, the Company includes the components of equity, long-term debt, net of cash and cash equivalents.
As ofAs of
December 31,
2020
December 31,
2019
Equity/(deficiency)25,774 (32,123)
Long-term debt55,732 90,782 
81,506 58,659 
Cash and cash equivalents(60,809)(53,367)
20,697 5,292 
The Company manages its capital structure and adjusts it in light of changes in economic conditions and the risk characteristics of the underlying assets. In doing so, the Company may issue new shares, restructure or issue new debt and acquire or dispose of assets.
Our exposure to market risk includes, but is not limited to, the following risks: changes in interest rates on our debt, changes in foreign currency exchange rates and commodity price fluctuations.
Interest rate risk
Interest rate risk is the risk that the future cash flows of a financial instrument will fluctuate because of changes in market interest rates. The Macquarie Credit Facility incurs interest at 4.5% plus the applicable USD LIBOR rate per annum. Based on our current $60.0 million outstanding balance, a 100 basis point change in the USD LIBOR rate would result in a change in interest expense of $0.6 million. We have not entered into any agreements to hedge against unfavorable changes in interest rates but may do so in the future to actively manage our exposure to interest rate risk.
Foreign currency exchange rate risk
Currency risk is risk that the fair value of future cash flows will fluctuate because of changes in foreign currency exchange rates. In addition, the value of cash and cash equivalents and other financial assets and liabilities denominated in foreign currencies can fluctuate with changes in currency exchange rates.
Since our revenues are denominated in U.S. dollars and our operating unit transacts much of its business in U.S. dollars, we are typically not subject to significant impacts from currency fluctuations. However, certain purchases of labor, operating supplies and capital assets are denominated in Ghana cedis, Euros, British pounds, Australian dollars, South African rand and Canadian dollars. To accommodate these purchases, we maintain operating cash accounts in non-US dollar currencies and appreciation of these non-US dollar currencies against the U.S. dollar results in a foreign currency gain and a decrease in non-U.S. dollar currencies results in a loss. During 2020 and 2019, we had no currency-related derivatives. At December 31, 2020 and December 31, 2019, we held cash and cash equivalents denominated in foreign currency of $20.6 million and $6.1 million, respectively.
Commodity price risk
Gold is our primary product and, as a result, changes in the price of gold can significantly affect our results of operations and cash flows. Based on our gold production in the year, a $100 per ounce increase in gold price would have resulted in approximately a $15.4 million and $13.0 million increase in our sales revenues and operating cash flows, respectively. To reduce gold price volatility, we have entered into costless collars consisting of put and call options as discussed in Note 24. A $100 per ounce change to the year end gold spot price of $1,891/oz (LBMA AM fix as at December 31, 2020) would have no impact to the year end costless collar positions expiring in 2021 and 2022. During the year ended December 31, 2020, the Company recognized unrealized losses of $2.2 million and realized losses of $2.5 million on non-hedge accounted collar contracts.
Credit risk
Credit risk is the risk that one party to a financial instrument will cause a financial loss for the other party by failing to discharge an obligation. Our credit risk is primarily associated with the deferred consideration for the sale of Prestea (Note 5), liquid financial assets and derivatives.
We limit exposure to credit risk on liquid financial assets by holding our cash, cash equivalents, restricted cash and deposits at highly-rated financial institutions. Management closely monitors its financial assets and does not have any significant concentration of credit risk other than the unsecured non-interest bearing receivable balances owed from FGR. The credit risk associated with the deferred consideration from the sale of Prestea has been managed through the due diligence process that considered the financial standing of the counter party and is supported by an unsecured parent guarantee. Risks associated with gold trade receivables is considered minimal as we sell gold to a credit-worthy buyer who settles promptly within two days of receipt of gold bullion.
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION
12 Months Ended
Dec. 31, 2020
Statement of cash flows [abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION
26. SUPPLEMENTAL CASH FLOW INFORMATION
During the year ended December 31, 2020, the Company paid interest of $7.1 million (year ended December 31, 2019 - $7.1 million).
Changes in working capital and taxes paid for the years ended December 31, 2020 and 2019 are as follows:
For the Years Ended
December 31,
20202019
Increase in prepaids and other(4,069)(1,230)
Increase in inventories(899)(2,261)
Increase in accounts receivable and other receivables(319)(2,108)
Decrease in other liability— (6,410)
Increase in accounts payable and accrued liabilities1,578 9,069 
Total changes in working capital(3,709)(2,940)
Income tax liabilities paid(25,759)(5,469)
Total changes in working capital and taxes paid(29,468)(8,409)
Other non-cash items include the following components:
For the Years Ended
December 31,
20202019
Variable consideration adjustment (Note 18)6,437 3,073 
Interest on financing component of deferred revenue (Note 10)3,026 4,288 
Accretion of 7% Convertible Debentures discount (Note 10)2,733 2,390 
Amortization of financing fees (Note 10)1,020 642 
Inventory write-off176 — 
Accretion of rehabilitation provisions (Note 10)155 191 
Interest on lease obligations98 22 
Loss/(gain) on disposal of assets40 (13)
Loss on fair value of marketable securities14 
PRSU settlement, net of tax— (349)
Accretion of long-term receivables discount (Note 10)(220)— 
Gain on modification of Macquarie credit facility (Note 19)(2,973)— 
10,506 10,253 
Reconciliation of debt arising from financing activities during the years ended December 31, 2020 and 2019:
Lease liabilitiesEcobank Loan IIIEcobank Loan IVVendor Agreement
7% Convertible Debentures
Macquarie Credit FacilityTotal
December 31, 20181,683 19,935 17,700 16,776 44,612 — 100,706 
Cash flows
Proceeds from debt agreements— — — — — 60,000 60,000 
Capitalized loan fees— — — — — (2,614)(2,614)
Principal payments on debt facilities(20,277)(18,000)(17,507)— — (55,784)
Principal payments on lease liabilities(1,416)— — — — — (1,416)
Principal payments on lease liabilities (discontinued operations)(25)— — — — — (25)
Non-cash changes
Additions to lease liabilities2,116 — — — — — 2,116 
Accretion of debt23 342 300 731 2,390 — 3,786 
December 31, 20192,381 — — — 47,002 57,386 106,769 
Cash flows
Proceeds from debt modification— — — — — 10,000 10,000 
Capitalized loan fees— — — — — (886)(886)
Principal payments on debt facilities— — — — — (10,000)(10,000)
Principal payments on lease liabilities(1,694)— — — — — (1,694)
Principal payments on lease liabilities (discontinued operations)(20)— — — — — (20)
Non-cash changes
Gain on modification of credit facility— — — — — (2,973)(2,973)
Amortization of deferred financing fees— — — — — 1,020 1,020 
Additions to lease liabilities599 — — — — — 599 
Accretion of debt98 — — — 2,733 — 2,831 
Foreign exchange loss132 — — — — — 132 
Derecognized on the sale of Prestea (Note 5)(15)— — — — — (15)
December 31, 20201,481 — — — 49,735 54,547 105,763 
v3.21.1
COMMITMENTS AND CONTINGENCIES
12 Months Ended
Dec. 31, 2020
Commitments And Contingencies [Abstract]  
COMMITMENTS AND CONTINGENCIES
27. COMMITMENTS AND CONTINGENCIES
The Company has capital and operating commitments of $0.3 million and $9.8 million respectively, all of which are expected to be incurred within the next year.

Due to the nature of the Company’s operations, various legal matters from time to time arise in the ordinary course of business. The Company accrues for such items when a liability is both probable and the amount can be reasonably estimated. In the opinion of Management, these matters will not have a material effect on the consolidated financial statements of the Company.

As part of the Prestea disposal transaction, the Company has provided indemnification to FGR for legal and tax matters that have arisen prior to the date of completion of the sale of Prestea. The Company continues to hold the view that no provision is required in respect of GRA demand notices against GSBPL for an amount of $2.3 million relating to customs-related findings, and that the Company complied with all requirements.

Our commitments and contingencies include the following items:

Environmental bonding in Ghana
The Ghana Environmental Protection Agency ("EPA") requires environmental compliance bonds that provide assurance for environmental remediation at our Wassa mining operation. To meet this requirement the Company placed environmental bonds in the form of bank guarantees totaling $13.7 million with a commercial bank in Ghana. These bonds are guaranteed by Golden Star Resources Ltd. The Company also held cash deposits of $2.1 million which is recorded as restricted cash on the consolidated balance sheets.
Government of Ghana's rights to increase its participation
Under Act 703, the Government of Ghana has (i) the right to acquire a special share in our Ghanaian subsidiaries at any time for no consideration or such consideration as the Government of Ghana and such subsidiaries might agree, and (ii) a pre-emptive right to purchase all gold and other minerals produced by such subsidiaries. A special share carries no voting rights and does not participate in dividends, profits or assets. If the Government of Ghana acquires a special share, it may require the Company to redeem the special share at any time for no consideration or for consideration determined by the Company. To date, the Government of Ghana has not sought to exercise any of these rights at our properties.
Royalties
Government of Ghana
The Government of Ghana receives a royalty equal to 5% of mineral revenues earned by Wassa.
Legal proceedings
On September 15, 2020, certain employees of GSBPL initiated proceedings before the courts in Ghana, claiming that the completion of the transaction for the sale of the Bogoso shares to FGR would trigger the termination of their existing employments, entitling them to severance payments. GSBPL retained legal counsel to defend the claim given no employment contracts were severed, amended or modified upon the completion of the sale transaction on September 30, 2020 and GSBPL continues to operate with existing employment contracts and contractual terms being honored.

On September 22, 2020, GSBPL filed an application in court for an order striking out the plaintiffs’ statement of claim for lack of standing or capacity and disclosing no reasonable cause of action. On February 16, 2021, the court ruled in favor of GSBPL that the plaintiffs’ pleadings disclosed no reasonable cause of action and were therefore frivolous, vexatious, and scandalous. Accordingly, the plaintiffs lacked the requisite standing or capacity to institute the action. In accordance with applicable laws, the plaintiffs have three months from the date of the ruling to file an appeal.

On April 1, 2020, the Company received notification of a United States federal securities class action complaint (the “Complaint”) that was filed against it on behalf of persons or entities that purchased or otherwise acquired the Company’s common stock on the NYSE American exchange from February 20, 2019 through July 30, 2019 inclusive. Also named as defendants were the Company’s Chief Executive Officer and Director Andrew Wray, the Company’s former President and Chief Executive Officer Samuel Coetzer, the Company’s former President Daniel Owiredu and the Company’s former Executive Vice President and Chief Financial Officer Andre van Niekerk. The Complaint alleged that the Company published false and misleading statements to artificially inflate the price of its common shares in violation of the US Securities Exchange Act of 1934. In September 2020, the Complaint was voluntarily dismissed by the plaintiff.
The Company is involved in other legal proceedings, from time to time, arising in the ordinary course of its business. It is not expected that any material liability will arise from current legal proceedings or have a material adverse effect on the Company’s future business, operations or financial condition.
v3.21.1
PRIOR YEAR COMPARATIVES
12 Months Ended
Dec. 31, 2020
Summary of reclassification or changes in presentation [Abstract]  
PRIOR YEAR COMPARATIVES
28. PRIOR PERIOD COMPARATIVES
Certain balances in the consolidated balance sheet as at December 31, 2019 have been reclassified to reflect the appropriate classification of income tax and derivative liabilities due to their materiality in the current reporting period. The effect of the reclassifications is to decrease prepaids and other by $1.5 million, decrease accounts payable and accrued liabilities by $2.5 million, increase current income tax liabilities by $0.8 million and increase current portion of derivative liabilities by $0.2 million as at December 31, 2019. The reclassifications have no impact to the consolidated statement of operations and comprehensive loss, consolidated statement of cash flows and consolidated statement of changes in equity for the year ended December 31, 2019.

Effective January 1, 2020, share-based compensation is excluded from corporate general and administrative expenses and as a result, the corporate general and administrative expenses for the year ended December 31, 2019 reduced by $3.1 million with share-based compensation of $3.1 million presented as a separate line in the consolidated statement of operations and comprehensive loss.
v3.21.1
BASIS OF PRESENTATION (Policies)
12 Months Ended
Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Going concern
Going concern
As at December 31, 2020, the Company had cash and cash equivalents of $60.8 million, net current assets excluding deferred revenue and the embedded derivative liability of $15.6 million and net cash provided by operations before working capital changes for the year then ended of $113.5 million. As at December 31, 2020, the Company was compliant with its debt covenants (refer to Note 25).

To date, the Company has been able to continue operations largely unaffected since the outbreak of the COVID-19 pandemic and gold production and shipments have continued without any significant disruptions. However, the Company cannot provide any assurances that its planned operations, production and capital expenditure for the foreseeable future will not be delayed, postponed or cancelled as a result of the COVID-19 pandemic or otherwise. The COVID-19 pandemic could (i) continue to affect financial markets, including the price of gold and the trading price of the Company’s shares, (ii) adversely affect the Company’s ability to raise capital, and (iii) cause continued interest rate volatility and movements that could make obtaining financing or refinancing debt obligations more challenging or more expensive or unavailable on commercially reasonable terms or at all. Furthermore, the Company may also experience regional risks which include, but are not limited to, a possible shut-down of the gold refining facility in South Africa where the Company delivers its gold production, an inability to ship gold across borders, delays in the supply chain of critical reagents, consumables and parts, and the impact on the delivery of critical capital projects. Any of these events or circumstances could have a material adverse effect on the Company’s business, financial condition and results of operations.
Management has prepared detailed cash flow forecasts to assess the economic impact of COVID-19 from a going concern and viability perspective. Based on these detailed cash flow forecasts, including any reasonably possible changes in the key
assumptions on which the cash flow forecasts are based and assess various scenarios related to COVID-19, Management believes that the Company will have adequate resources to continue as a going concern for the foreseeable future, and at this point in time there are no material uncertainties regarding going concern. Management has concluded that it is appropriate to prepare the consolidated financial statements on a going concern basis.
v3.21.1
SUMMARY OF ACCOUNTING POLICIES (Policies)
12 Months Ended
Dec. 31, 2020
Significant Accounting Policies [Abstract]  
Statement of compliance
Statement of compliance
The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS"), as issued by the International Accounting Standards Board ("IASB") and with interpretations of the International Financial Reporting Interpretations Committee ("IFRIC") which the Canadian Accounting Standards Board has approved for incorporation into Part 1 of the CPA Canada Handbook – Accounting.
These consolidated financial statements were approved by the Company's Board of Directors on February 24, 2021.
Basis of presentation
Basis of presentation
These consolidated financial statements include the accounts of the Company and its subsidiaries, whether owned directly or indirectly. The financial statements of the subsidiaries are prepared for the same period as the Company using consistent accounting policies for all periods presented, except for the changes in accounting policies described in Note 3.
All inter-company balances and transactions have been eliminated. Subsidiaries are entities controlled by the Company. Non-controlling interests in the net assets of consolidated subsidiaries are a separate component of the Company's equity.
The consolidated financial statements have been prepared on a historical cost basis, except for derivative financial instruments and contingent consideration which are measured at fair value through profit or loss.
Cash and cash equivalents
Cash and cash equivalents
Cash includes cash deposits in any currency residing in chequing and sweep accounts. Cash equivalents consist of money market funds and other highly liquid investments purchased with maturities of three months or less. Investments with maturities greater than three months and up to one year are classified as short-term investments, while those with maturities in excess of one year are classified as long-term investments. Cash equivalents and short-term investments are stated at amortized cost, which typically approximates market value.
Restricted cash
Restricted cash
Cash balances that are subject to legal or contractual obligations are classified separately on the consolidated balance sheets as restricted cash.
Inventories
Inventories
Inventory classifications include "stockpiled ore," "in-process inventory," "finished goods inventory" and "materials and supplies". The stated value of all production inventories includes direct production costs and attributable overhead and depreciation incurred to bring the materials to their current point in the processing cycle. General and administrative costs for corporate offices are not included in any inventories.
Stockpiled ore represents coarse ore that has been extracted from the mine and is stored for future processing. Stockpiled ore is measured by estimating the number of tonnes (by physical surveys) added to, or removed from the stockpile, the number of contained ounces (based on assay data) and estimated gold recovery percentage. Stockpiled ore value is based on the costs incurred (including depreciation and amortization) in bringing the ore to the stockpile. Costs are added to the stockpiled ore based on current mining costs per tonne and are removed at the average cost per tonne of ore in the stockpile.
In-process inventory represents material that is currently being treated in the processing plants to extract the contained gold and to transform it into a saleable product. The amount of gold in the in-process inventory is determined by assay and by measure of the quantities of the various gold-bearing materials in the recovery process. The in-process gold is valued at the average of the beginning inventory and the cost of material fed into the processing stream plus in-process conversion costs including applicable mine-site overheads, depreciation and amortization related to the processing facilities.
Finished goods inventory is saleable gold in the form of doré bars. Included in the costs are the direct costs of the mining and processing operations as well as direct mine-site overheads, amortization and depreciation.
Materials and supplies inventories consist mostly of equipment parts and other consumables required in the mining and ore processing activities.
All inventories are valued at the lower of average cost or net realizable value.
Property, plant and equipment
Property, plant and equipment
Property, plant and equipment assets, including machinery, processing equipment, mining equipment, mine site facilities, buildings, vehicles and expenditures that extend the life of such assets, are initially recorded at cost including acquisition and installation costs. Property, plant and equipment are subsequently measured at cost, less accumulated depreciation and accumulated impairment losses.
The costs of self-constructed assets include direct construction costs and direct overhead costs during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Depreciation for mobile equipment and other assets having estimated lives shorter than the estimated life of the ore reserves is calculated using the straight-line method at rates which depreciate the cost of the assets, less their anticipated residual values, if any, over their estimated useful lives. Mobile mining equipment is amortized over a five-year life. Assets, such as processing plants, power generators and buildings, which have an estimated life equal to or greater than the estimated life of the ore reserves, are amortized over the life of the proven and probable reserves of the associated mining property using a units-of-production amortization method, less their anticipated residual values, if any. The net book value of property, plant and equipment assets is charged against income if the mine site is abandoned and it is determined that the assets cannot be economically transferred to another project or sold.
The residual values, useful lives and method of depreciation of property, plant and equipment are reviewed at each reporting period end and adjusted prospectively, if appropriate.Gains and losses on the disposal of an item of property, plant and equipment are determined by comparing the proceeds from disposal with the carrying amount and are recognized net in the consolidated statement of operations.
Mining properties
Mining properties
Mining property assets, including property acquisition costs, tailings storage facilities, mine-site development and drilling costs where proven and probable reserves have previously been established, pre-production waste stripping, condemnation drilling, roads, feasibility studies and wells are recorded at cost. The costs of self-constructed assets include direct construction costs, direct overhead costs and allocated interest during the construction phase. Indirect overhead costs are not included in the cost of self-constructed assets.
Mining property assets are amortized over the life of the proven and probable reserves to which they relate, using a units-of-production amortization method. At open pit mines the costs of removing overburden from an ore body in order to expose ore during its initial development period are capitalized.
Mineral reserves and resources
Determining mineral reserves and resources is a complex process involving numerous variables and is based on a professional evaluation using accepted international standards for the assessment of mineral reserves. Estimation is a subjective process, and the accuracy of such estimates is a function of the quantity and quality of available data, the assumptions made and judgments used in engineering and geological interpretation. Mineral reserve estimation may vary as a result of changes in the price of gold, production costs, and with additional knowledge of the ore deposits and mining conditions.
Differences between Management's assumptions, including economic assumptions such as metal prices and market conditions, could have a material effect in the future on the Company's results and financial position, particularly a change in the rate of depreciation and amortization of the related mining assets and the recognition of deferred revenue.
Underground mine development costs
Underground mine development costs
Underground mine development costs include development costs to build new shafts, drifts and ramps that will enable the Company to physically access ore underground. The time over which the Company will continue to incur these costs depends on the mine life. These underground development costs are capitalized as incurred. Capitalized underground development costs incurred to enable access to specific ore blocks or areas of the underground mine, and which only provide an economic benefit over the period of mining that ore block or area, are depreciated on a units-of-production basis, whereby the denominator is estimated ounces of gold in proven and probable reserves and the portion of resources within that ore block or area that is considered probable of economic extraction. If capitalized underground development costs provide an economic benefit over the entire mine life, the costs are depreciated on a units-of-production basis, whereby the denominator is the estimated ounces of gold in total accessible proven and probable reserves and the portion of resources that is considered probable of economic extraction.
Borrowing costs
Borrowing costs
Borrowing costs attributable to the acquisition, construction or production of a qualifying asset are capitalized. Qualifying assets are assets that require a significant amount of time to prepare for their intended use, including projects that are in the exploration and evaluation, development or construction stages. Capitalized borrowing costs are considered an element of the cost of the qualifying asset which is determined based on gross expenditures incurred on an asset. Capitalization ceases when the asset is substantially complete or if active development is suspended or ceases. Where the funds used to finance a qualifying asset form part of general borrowings, the amount capitalized is calculated using a weighted average of rates applicable to the relevant borrowings during the period. Where funds borrowed are directly attributable to a qualifying asset, the amount capitalized represents the borrowing costs specific to those borrowings. Other borrowing costs are recognized as an expense in the period in which they are incurred.
Impairment of long-lived assets
Impairment of long-lived assets
The Company assesses at each reporting period whether there is an indication that an asset or group of assets may be impaired. When impairment indicators exist, the Company estimates the recoverable amount of the asset and compares it against the asset's carrying amount. The recoverable amount is the higher of its fair value less cost of disposal ("FVLCD") and the asset's value in use ("VIU"). If the carrying amount exceeds the recoverable amount, an impairment loss is recorded in the consolidated statement of operations.
In assessing VIU, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset not already reflected in the estimates of future cash flows. The cash flows are based on best estimates of expected future cash flows from the continued use of the asset and its eventual disposal.
FVLCD is best evidenced if obtained from an active market or binding sale agreement. Where neither exists, the fair value is based on the best estimates available to reflect the amount that could be received from an arm's length transaction.
Future cash flows are based on estimated quantities of gold and other recoverable metals, expected price of gold (considering current and historical prices, price trends and related factors), production levels and cash costs of production, capital and reclamation costs, all based on detailed engineered life-of-mine plans.
Numerous factors including, but not limited to, unexpected grade changes, gold recovery variances, shortages of equipment and consumables, and equipment failures could impact our ability to achieve forecasted production schedules from proven and probable reserves. Additionally, commodity prices, capital expenditure requirements and reclamation costs could differ from
the assumptions used in the cash flow models used to assess impairment. The ability to achieve the estimated quantities of recoverable minerals from exploration stage mineral interests involves further risks in addition to those factors applicable to mineral interests where proven and probable reserves have been identified, due to the lower level of confidence that the identified mineralized material can ultimately be mined economically.
If an impairment loss reverses in a subsequent period, the carrying amount (post reversal) of the related asset is increased to the revised estimate of recoverable amount to the extent that the increased carrying amount does not exceed the carrying amount that would have been determined had no impairment loss been recognized for the asset previously. Reversals of impairment losses are recognized in the consolidated statement of operations in the period the reversals occur.
Material changes to any of the factors or assumptions discussed above could result in future asset impairments.
Carrying value of assets and impairment charges
The Company undertakes a review of its assets at each reporting period to determine whether any indication of impairment exists. Where an indicator of impairment exists, a formal estimate of the recoverable amount of the asset or cash-generating unit ("CGU") is made, which is considered to be the higher of its FVLCD and VIU. An impairment loss is recognized when the
carrying value of the asset or CGU is higher than the recoverable amount. In undertaking this review, Management is required to make significant estimates of, amongst other things, discount rates, future production and sale volumes, metal prices, reserves and resource quantities, future operating and capital costs and reclamation costs to the end of the mine's life. These estimates are subject to various risks and uncertainties, which may ultimately have an effect on the expected recoverability of the carrying values of the asset or CGU. In determining a CGU, Management has examined the smallest identifiable group of assets that generates cash inflows that are largely independent of cash inflows from other assets or group of assets.
Assessment of impairment and reverse impairment indicators
Management applies significant judgment in assessing whether indicators of impairment or reverse impairment exist for an asset or group of assets which would necessitate impairment testing. Internal and external factors such as significant changes in the use of the asset, commodity prices and production costs are used by Management in determining whether there are any indicators.
Rehabilitation provisions
Rehabilitation provisions
The Company records a liability and corresponding asset for the present value of the estimated costs of legal and constructive obligations for future site reclamation and closure where the liability is probable, and a reasonable estimate can be made of the obligation. The estimated present value of the obligation is reassessed on a periodic basis or when new material information becomes available. Increases or decreases to the obligation usually arise due to changes in legal or regulatory requirements, the extent of environmental remediation required, methods of reclamation, cost estimates, inflation rates, or discount rates. Changes to the provision for reclamation and remediation obligations related to operating mines, which are not the result of current production of inventory, are recorded with an offsetting change to the related asset. Changes to the provision for reclamation and remediation obligations related to suspended mine operations are recognized in the consolidated statements of operations. The present value is determined based on current market assessments of the time value of money using discount rates based on the risk-free rate maturing approximating the timing of expected expenditures to be incurred and adjusted for country related risks. The periodic unwinding of the discount is recognized in the consolidated statement of operations as a finance expense.
Rehabilitation provisionsEnvironmental reclamation and closure liabilities are recognized at the time of environmental disturbance, in amounts equal to the discounted value of expected future reclamation and closure costs. The estimated future cash costs of such liabilities are based primarily upon environmental and regulatory requirements in the jurisdictions in which we operate as well as any other constructive obligations that exist. The liability represents Management's best estimates of cash required to settle the liability, inflation, assumptions of risks associated with future cash flows and the applicable risk-free interest rates for discounting the future cash outflow. The liability is reassessed and remeasured at each reporting date.
Deferred revenue
Deferred revenue
Deferred revenue consists of: (i) initial cash payments received by the Company for future delivery of payable gold under the terms of the Company’s Streaming Agreement as defined in Note 18, Deferred Revenue, and (ii) a significant financing component of the Company’s Streaming Agreement. Deferred revenue is increased as interest expense is recognized based on the implicit interest rate of the discounted cash flows arising from the expected delivery of ounces under the Company’s Streaming Agreement.
The amount by which the deferred revenue balance is reduced and recognized into revenue is based on a rate per ounce of gold delivered under the Streaming Agreement. This rate per ounce of gold delivered relating to the payments received by the Company is based on the remaining deferred revenue balance divided by the ounces that are expected to be delivered over the term of the Stream Agreement.
As the Company’s Streaming Agreement contains a variable component, IFRS 15 requires that the transaction price be updated and re-allocated on an ongoing basis. As a result, the deferred revenue recognized per ounce of gold delivered under the Streaming Agreement will require an adjustment each time there is a significant change in the underlying gold production profile of a mine. Should a change in the transaction price be necessary, a cumulative catch-up adjustment to revenue will be made in the period in which the change occurs, to reflect the updated production profile expected to be delivered under the Streaming Agreement.
Deferred revenue
Significant judgment is required in determining the appropriate accounting for the Streaming Agreement that has been entered into. Management has determined that the Company assumes significant business risk associated with the timing and amount of ounces of gold ounces being delivered. As such, the deposits received have been recorded as deferred revenue liabilities in the consolidated balance sheet. The amount of gold ounces expected to be delivered can increase or decrease from previous estimates.

The amount by which the deferred revenue balance is reduced and recognized into revenue is based on a rate per ounce of gold delivered under the Streaming Agreement. This rate per ounce of gold delivered relating to the payments received by the Company is based on the remaining deferred revenue balance divided by the ounces that are expected to be delivered over the term of the Streaming Agreement.
As the Company’s Streaming Agreement contains a variable component, IFRS 15 requires that the transaction price be updated and re-allocated on an ongoing basis. As a result, the deferred revenue recognized per ounce of gold delivered under the Streaming Agreement will require an adjustment annually and each time there is a significant change in the underlying forecast gold production profile of a mine. Should a change in the transaction price be necessary, a cumulative catch-up adjustment to revenue will be made in the period in which the change occurs, to reflect the updated forecast production profile expected to be delivered under the Streaming Agreement.
Foreign currency transactions
Foreign currency transactions
The Company's presentation currency of its consolidated financial statements is the U.S. dollar, as is the functional currency of its operations. The functional currency of all consolidated subsidiaries is the U.S. dollar. All values are rounded to the nearest thousand, unless otherwise stated.
Monetary assets and liabilities denominated in foreign currencies are translated into U.S. dollars at period end exchange rates. Non-monetary assets and liabilities denominated in foreign currencies that are measured at fair value are translated into U.S. dollars at the exchange rate at the date that the fair value was determined. Income and expense items are translated at the exchange rate in effect on the date of the transaction. Exchange gains and losses resulting from the translation of these amounts are included in net loss, except those arising on the translation of equity investments at fair value through other comprehensive income that are recorded in other comprehensive income. Non-monetary assets and liabilities denominated in foreign currencies that are measured at historical cost are translated at the exchange rate in effect at the transaction date.
Income taxes
Income taxes
Income taxes comprise the provision for (or recovery of) taxes actually paid or payable (current taxes) and for deferred taxes.
Current taxes are based on taxable earnings in the year. Current tax is calculated using tax rates and laws that were enacted or substantively enacted at the balance sheet date in the respective jurisdictions.
Current income tax assets and current income tax liabilities are only offset if a legally enforceable right exists to offset the amounts and the Company intends to settle on a net basis or to realize the asset and settle the liability simultaneously.
Deferred income tax assets and liabilities are recognized for the expected future tax consequences attributable to temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements. Deferred income tax assets and liabilities are computed using enacted or substantially enacted income tax rates in effect when the temporary differences are expected to reverse. The effect on the deferred tax assets and liabilities of a change in tax rates is recognized in the period of substantial enactment. The provision for or the recovery of deferred taxes is based on the changes in deferred tax assets and liabilities during the period.
The carrying amount of deferred income tax assets or liabilities are reviewed at the end of each reporting period and recognized to the extent that it is probable that taxable earnings will be available against which deductible temporary differences can be utilized.
Income taxes
We deal with uncertainties and judgments in the application of complex tax regulations in the various jurisdictions where our properties are located. The amount of taxes paid is dependent upon many factors, including negotiations with taxing authorities in the various jurisdictions and resolution of disputes arising from our international tax audits. We recognize potential liabilities and record tax liabilities for anticipated tax audit issues in our various tax jurisdictions based on our best estimate of additional taxes payable. We adjust these tax estimates in consideration of changing facts and circumstances, however, due to the complexity of some of these uncertainties, the ultimate resolution may result in payment that is materially different from our estimates of our tax liabilities. If our estimate of tax liability proves to be less than the ultimate assessment, an additional charge to expense would result. If the estimate of tax liabilities proves to be greater than the ultimate assessment, a tax benefit is recognized.
A deferred tax asset is recognized to the extent that it is probable that taxable earnings will be available against which deductible temporary differences can be utilized.
Net income/(loss) per share Net income/(loss) per shareBasic income/(loss) per share of common stock is calculated by dividing income available to Golden Star's common shareholders by the weighted average number of common shares issued and outstanding during the period. In periods with earnings, the calculation of diluted net income per common share uses the treasury stock method to compute the dilutive effects of stock options, convertible debentures and other potentially dilutive instruments. In periods of loss, diluted net loss per share is equal to basic loss per share.
Revenue recognition
Revenue recognition
Revenue from the sale of gold is recognized when the Company transfers control over to a customer. The Company’s spot sales of gold are transported to a gold refiner who locates a buyer and arranges sale of the gold. Effective March 20, 2020, the sale generally completes on the day of arrival of gold at the refinery in South Africa as a consequence of the change in shipment logistics due to the COVID-19 pandemic. Previously, the sale of gold completed on the same day the gold was shipped from the mine site. The sales price is generally set with reference to the London A.M. or P.M. fix on the day of arrival of gold at the refinery.
Revenue recognition for the Company’s Streaming Agreement is disclosed in the accounting policy for deferred revenue.
Share-based compensation
Share-based compensation
Under the Company's Fourth Amended and Restated 1997 Stock Option Plan, common share options may be granted to executives, employees, consultants and non-employee directors. Compensation expense for such grants is recorded in the consolidated statements of operations, with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair value of the option at the time of grant, measured by reference to the fair value determined using a Black-Scholes valuation model, and is recognized over the vesting periods of the respective options on a graded basis. Consideration paid to the Company on exercise of options is credited to share capital.
Under the Company's Deferred Share Unit ("DSU") plan, DSUs may be granted to executive officers and directors. Compensation expense for such grants is recorded in the consolidated statements of operation with a corresponding increase recorded in the contributed surplus account in the consolidated balance sheets. The expense is based on the fair values at the time of grant and is recognized over the vesting periods of the respective DSUs. Upon exercise the Company's compensation committee may, at its discretion, issue cash, shares or a combination thereof.
The Company's Share Appreciation Rights ("SARs") plan allows SARs to be issued to executives, employees and directors. These awards are settled in cash on the exercise date equal to the Company's stock price less the strike price. Since these awards are settled in cash, the Company marks-to-market the associated expense for each award at the end of each reporting period using a Black-Scholes model. The Company accounts for these as liability awards and marks-to-market the fair value of the award until final settlement. 
Under the Company's Performance Share Units ("PSU") plan, PSUs may be granted to executives, employees and non-employee directors. Each PSU represents one notional common share that is redeemed for cash based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PSUs vest at the end of a three-year performance. The cash award is determined by multiplying the number of units by the performance adjusting factor, which ranges from 0% to 200%. The performance factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the PSU plan. As the Company was required to settle these awards in cash, they were accounted for as liability awards with corresponding compensation expense recognized. The final PSU grant vested on December 31, 2018 and as a result the Company did not recognize a PSU expense in 2019 and 2020.
Under the Company's 2017 performance and restricted share unit plan (the "2017 PRSU Plan"), performance share units ("2017 PSUs") and restricted share units ("2017 RSUs" and, together with the 2017 PSUs, the "Share Units") may be issued to any employee or officer of the Company or its designated affiliates. Share Units may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market; (iii) a cash payment; or (iv) a combination of (i), (ii) and (iii).
Each PRSU represents one notional common share that is redeemed for common shares or common shares plus cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. The PRSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of Share Units by the performance adjustment factor, which ranges from 0% to 200%. The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies as listed in the 2017 PRSU Plan. As the Company has a practice of settling these awards in common shares, they are accounted for as equity awards with corresponding compensation expense recognized.
In February 2020, the Company adopted a new UK Performance Share Unit Plan ("UK PSU Plan") which was approved by Golden Star shareholders on May 7, 2020. Under the UK PSU Plan, performance share units ("UK PSUs") may be issued to UK resident employees of the Company or its designated affiliates. UK PSUs may be redeemed for: (i) common shares issued from treasury; (ii) common shares purchased in the secondary market at the election of the participant and subject to consent of the Company; (iii) a cash payment at the election of the participant and subject to consent of the Company; or (iv) a combination of (i), (ii) and (iii).
Each UK PSU represents one notional common share that is redeemed for common shares or common shares and/or cash subject to the consent of the Company based on the value of a common share at the end of the three-year performance period, to the extent performance and vesting criteria have been met. UK PSUs vest at the end of a three-year performance period. The award is determined by multiplying the number of UK PSUs by the performance adjustment factor, which ranges from 0% to 200%.
The performance adjustment factor is determined by comparing the Company's share price performance to the share price performance of a peer group of companies determined by the Compensation Committee of the Board of Directors. The Company plans to settle these awards in common shares of the Company and so they are accounted for as equity awards with corresponding compensation expense recognized.
Right of use asset and lease liabilities
Right of use asset and lease liabilities
The lease liability is initially measured as the present value of future lease payments discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, each operation’s applicable incremental borrowing rate. The incremental borrowing rate is the rate which the operation would have to pay to borrow, over a similar term and with a similar security, the funds necessary to obtain an asset of similar value to the right-of-use asset in a similar economic environment. 
Lease payments included in the measurement of the lease liability comprise the following: fixed payments, including in-substance fixed payments, less any lease incentives receivable, variable lease payments that depend on an index or a rate, initially measured using the index or rate as at the commencement date, amounts expected to be payable by the Company under residual value guarantees, the exercise price of a purchase option if the Company is reasonably certain to exercise that option, and payments of penalties for terminating the lease, if the Company expects to exercise an option to terminate the lease.
The lease liability is subsequently measured by increasing the carrying amount to reflect interest on the lease liability, reducing the carrying amount to reflect lease payments made, and remeasuring the carrying amount to reflect any reassessment or lease modifications.
The lease liability is remeasured when there is a change in future lease payments arising from a change in an index or rate, if there is a change in the Company’s estimate of the amount expected to be payable under a residual value guarantee, or if the Company changes its assessment of whether it will exercise a purchase, extension or termination option. 
The right-of-use asset is initially measured at cost, which comprises the following: the amount of the initial measurement of the lease liability, any lease payments made at or before the commencement date, less any lease incentives received, any initial direct costs incurred by the Company, and an estimate of costs to be incurred by the Company in dismantling and removing the underlying asset, restoring the site on which it is located or restoring the underlying asset to the condition required by the terms and conditions of the lease, unless those costs are incurred to produce inventories.
The right-of-use asset is subsequently measured at cost, less any accumulated depreciation and any accumulated impairment losses, and adjusted for any remeasurement of the lease liability. It is depreciated in accordance with the Company’s accounting policy for plant and equipment, from the commencement date to the earlier of the end of its useful life or the end of the lease term. 
Each lease payment is allocated between the lease liability and finance cost. The finance cost is charged to consolidated statements of operations over the lease period so as to produce a constant periodic rate of interest on the remaining balance of the liability for each period.
On the consolidated balance sheets, right-of-use assets and lease liabilities are reported in mineral properties, plant and equipment and debt and lease liabilities, respectively.
Financial instruments
Financial instruments
Financial assets
The Company recognizes all financial assets initially at fair value and classifies them into one of the following measurement categories: fair value through profit or loss (“FVTPL”), fair value through other comprehensive income (“FVOCI”) or amortized cost, as appropriate.
The Company assesses credit risk on accounts and other receivables at the end of each reporting period, measuring expected credit losses using a provision based matrix based on factors that are specific to the respective trade receivables, and changes in credit risk since the initial recognition of the respective financial instrument.
Financial liabilities
The Company recognizes all financial liabilities initially at fair value and classifies them as either FVTPL or loans and borrowings, as appropriate. The Company has not classified any of its derivatives as hedging instruments in an effective hedge.
Derivatives
From time to time the Company may utilize foreign exchange and commodity price derivatives to manage exposure to fluctuations in foreign currency exchange rates and gold prices, respectively. The Company does not employ derivative financial instruments for trading purposes or for speculative purposes. Derivative instruments are recorded on the balance sheet at fair value with changes in fair value recorded in the consolidated statements of operations. The Company did not have any foreign exchange derivatives outstanding at December 31, 2020.
7% Convertible Debentures embedded derivative
The Company's 7% Convertible Debentures embedded derivative is considered a financial instrument at FVTPL. The embedded derivative was recorded at fair value on the date of debt issuance. It is subsequently remeasured at fair value at each reporting date, and the changes in the fair value are recorded in the consolidated statements of operations. The fair value of the embedded derivative is determined using a convertible note valuation model, using assumptions based on market conditions existing at the reporting date.
Non-hedge derivative contracts
The non-hedge accounted costless collar contracts are considered FVTPL financial instruments with fair value determined using pricing models that utilize a variety of observable inputs that are a combination of quoted prices, applicable yield curves and credit spreads. The non-hedge derivative contracts are included within derivative liabilities on the balance sheet, with liabilities for positions expiring within one year classed as current derivative liabilities.
Share capital
Share capital
Common shares are classified as equity. Costs directly attributable to the issue of new shares or share options are shown in equity as a deduction, net of tax, from the gross proceeds.
Discontinued operations
Discontinued operation
A discontinued operation is a component of the Company's business, the operations and cash flows of which can be clearly distinguishable from the rest of the Company and which:
represents a separate major line of business or geographic area of operations;
is part of a single coordinated plan to dispose of a separate major line of business or geographic area of operations; or
is a subsidiary acquired exclusively with a view to re-sale.
When an operation is classified as discontinued, the comparative consolidated statement of operations is re-presented as if the operation had been discontinued from the start of the comparative year.Discontinued operationsSignificant judgement was applied regarding classification of Prestea as a discontinued operation and whether the sale of Prestea represents a separate major line of business or geographical area. Management has considered that Prestea represents a separate major line of business considering Prestea is a separate segment and legal entity that has its own management team, employees, books and records and has a separate operating mine, processing plant and a different mining process than the Wassa mine and does not blend any of its gold inventories with Wassa. Further, the operating mine and processing plant are located in different geographic areas in Ghana. Accordingly, it was classified as a discontinued operation.
Deferred consideration
Deferred consideration
Where settlement of any part of cash consideration is deferred, the amounts receivable in the future are discounted to their present value as at the date of disposal.
The fair value of any contingent consideration is determined based on present value and the discount rate used is adjusted for counterparty or own credit risk. Any changes in fair value are recognized in the consolidated statement of operations.
Changes in accounting policies and standards, interpretations and amendments not yet effective
Changes in accounting policies
The Company has adopted the following revised accounting standard effective January 1, 2020. The changes were made in accordance with the applicable transitional provisions.
Definition of a Business (Amendments to IFRS 3)

The amendments in Definition of a Business (Amendments to IFRS 3) are changes to Appendix A Defined terms, the application guidance, and the illustrative examples of IFRS 3 only. It:

clarifies that to be considered a business, an acquired set of activities and assets must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs; 
narrow the definitions of a business and of outputs by focusing on goods and services provided to customers and by removing the reference to an ability to reduce costs; 
add guidance and illustrative examples to help entities assess whether a substantive process has been acquired; 
remove the assessment of whether market participants are capable of replacing any missing inputs or processes and continuing to produce outputs; and 
add an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business.

There was no accounting impact to the consolidated financial statements on adoption of this standard.

The Company will adopt the following revised accounting standard effective January 1, 2021, with no accounting impact to the consolidated financial statements for the year ended December 31, 2020.

IBOR Reform - phase 2 amendments

In August 2020, the IASB published Phase 2 of its amendments to IFRS 9, IFRS 7 and IFRS 16 to address issues that impact financial reporting at the time of IBOR replacement with alternative rates. The amendments provide a practical expedient to ease the potential burden of accounting or changes in contractual cash flows, provide relief from specific hedge accounting requirements, and add disclosure requirements, at the time of IBOR replacement. The amendments are effective for annual reporting periods beginning on or after January 1, 2021, with early adoption permitted. The Company is currently evaluating the impact of these amendments on its consolidated financial statements.
Fair value of financial instruments, including embedded derivatives
Fair value of financial instruments, including embedded derivatives
Where the fair value of financial assets and financial liabilities recorded in the financial statements cannot be derived from active markets, their fair value is determined using valuation techniques including the discounted cash flow model. The inputs to these models are taken from observable markets where possible, but where this is not feasible, a degree of judgment is required in establishing fair values. The judgments include considerations of inputs such as liquidity risk, credit risk and volatility. Changes in assumptions about these factors could affect the reported fair value of financial instruments.
When measuring the fair value of an asset or liability, the Company uses observable market data to the greatest extent possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows:
    Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities
    Level 2: inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices)
    Level 3: inputs for the asset or liability that are not based on observable market data (unobservable inputs)
Units of production depreciation Units of production depreciationThe mineral properties and a large portion of the property, plant and equipment is depreciated/amortized using the units of production method over the expected operating life of the mine based on estimated recoverable ounces of gold, which are the prime determinants of the life of a mine. Estimated recoverable ounces of gold include proven and probable mineral reserves. Changes in the estimated mineral reserves will result in changes to the depreciation charges over the remaining life of the operation. A decrease in the mineral reserves would increase depreciation and amortization expense and this could have a material impact on the operating results. The amortization base is updated on an annual basis based on the new mineral reserve and resource estimates.
Expected credit losses Expected credit lossesSignificant judgement is required in determining the recoverability of deferred consideration recognized from the sale of Prestea (Note 5). Specifically, Management is required to estimate the probability of default and the loss given default, at the end of each reporting period. Management assesses the credit risk by taking into account factors that are both specific to the receivable and the general economic environment in which the relevant parties operate.
v3.21.1
SALE OF PRESTEA (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure Of Detailed Information Of Non-Current Assets Held For Sale And Discontinued Operations [Abstract]  
Disclosure of analysis of single amount of discontinued operations
The carrying amounts of the Prestea net liabilities as at the date of sale (September 30, 2020), including the deferred revenue relating to the Prestea portion of the previous stream agreement, and the resulting loss on sale are as follows:

Cash and cash equivalents1,692 
Accounts receivable1,727 
Inventories12,653 
Prepaids and other1,399 
Restricted cash991 
Mining interests82,648 
Total assets101,110 
Accounts payable(39,475)
Rehabilitation provisions(52,867)
Deferred revenue (9,072)
Debt(15)
Total liabilities(101,429)
Carrying value of net liabilities(319)
Fair value of deferred consideration (Note 13)31,679 
Gain on sale of Prestea before non-controlling interest31,998 
Derecognition of non-controlling interest (68,565)
Loss on sale of Prestea(36,567)
The components of net loss from discontinued operations and cash flow information for the years ended December 31, 2020 and December 31, 2019 were as follows:
For the Years Ended December 31,
 20202019
Revenue35,731 60,917 
Cost of sales excluding depreciation and amortization44,637 76,217 
Depreciation and amortization5,249 11,920 
Mine operating loss(14,155)(27,220)
Prestea general and administrative expense1,050 1,293 
Other expense, net4,904 (322)
Impairment charges— 56,762 
Loss on sale of Prestea36,567 — 
Loss before finance and tax(56,676)(84,953)
Finance (income)/expense, net(242)3,009 
Net loss from discontinued operations(56,434)(87,962)
Net income/(loss) and comprehensive loss from discontinued operations attributable to non-controlling interest34,224 (15,211)
Net loss and comprehensive loss from discontinued operations attributable to Golden Star shareholders(90,658)(72,751)
For the Years Ended
December 31,
 20202019
Net cash used in operating activities(23,915)(27,280)
Net cash used in investing activities(7,475)(10,923)
Net cash used in financing activities(20)(25)
Net cash used by discontinued operations(31,410)(38,228)
v3.21.1
SEGMENTED INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of operating segments [abstract]  
Disclosure of operating segments
For the Years Ended December 31,WassaOtherCorporateTotal
2020
Revenue272,481 — — 272,481 
Mine operating expenses107,400 — — 107,400 
Severance charges45 — — 45 
Operating costs from metal inventory1,918 — — 1,918 
Inventory write-off176 — — 176 
Royalties14,883 — — 14,883 
Cost of sales excluding depreciation and amortization124,422 — — 124,422 
Depreciation and amortization23,727 — — 23,727 
Mine operating profit124,332 — — 124,332 
Income tax expense48,266 — — 48,266 
Net loss from continuing operations attributable to non-controlling interest(365)— — (365)
Net income/(loss) from continuing operations attributable to Golden Star71,213 (1,153)(31,542)38,518 
Capital expenditures45,155 — 69 45,224 
2019
Revenue203,820 — — 203,820 
Mine operating expenses98,722 — — 98,722 
Severance charges225 — — 225 
Operating costs from metal inventory299 — — 299 
Royalties10,877 — — 10,877 
Cost of sales excluding depreciation and amortization110,123 — — 110,123 
Depreciation and amortization17,134 — — 17,134 
Mine operating profit76,563 — — 76,563 
Income tax expense27,439 — — 27,439 
Net income from continuing operations attributable to non-controlling interest4,671 — — 4,671 
Net income/(loss) from continuing operations attributable to Golden Star35,357 1,190 (31,230)5,317 
Capital expenditures60,123 — — 60,123 
Segmented Assets
The following table presents the segmented assets:
WassaPresteaOtherCorporateTotal
December 31, 2020
Total assets285,573 — 378 57,910 343,861 
December 31, 2019
Total assets 232,182 94,453 2,951 43,022 372,608 
v3.21.1
REVENUE (Tables)
12 Months Ended
Dec. 31, 2020
Revenue [abstract]  
Components of revenue
Revenue includes the following components:
For the Years Ended
December 31,
 20202019
Revenue - Spot sales265,593 194,626 
Cash payment proceeds6,197 4,610 
Deferred revenue recognized8,662 10,220 
Variable consideration adjustment(7,971)(5,636)
Revenue - Streaming Agreement6,888 9,193 
Total revenue272,481 203,820 
v3.21.1
COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Cost of sales excluding depreciation and amortization
Cost of sales, excluding depreciation and amortization, include the following components:
For the Years Ended
December 31,
 20202019
Contractors8,671 11,133 
Electricity9,427 10,219 
Fuel5,449 5,744 
Raw materials and consumables 22,217 17,702 
Salaries and benefits37,806 33,152 
Maintenance parts and consumables14,714 12,103 
General and administrative overheads7,714 8,023 
Sales-related costs1,402 646 
Mine operating expenses107,400 98,722 
Severance charges45 225 
Operating costs to metal inventory1,918 299 
Inventory write-downs (Note 14)176 — 
Royalties14,883 10,877 
124,422 110,123 
v3.21.1
OTHER EXPENSE, NET (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Schedule of other expense
Other expense includes the following components:
For the Years Ended December 31,
20202019
Realized loss on non-hedge derivative contracts (Note 24)2,476 — 
Corporate office relocation costs407 7,221 
Loss/(gain) on disposal of assets40 (13)
Other expenses1,926 4,679 
4,849 11,887 
v3.21.1
FINANCE EXPENSE, NET (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Components of finance income and expense
Finance expense and income include the following components:
For the Years Ended December 31,
 20202019
Interest expense on principal debt7,106 4,767 
Interest on financing component of deferred revenue (Note 18)3,026 4,288 
Accretion of 7% Convertible Debentures discount (Note 19)
2,733 2,390 
Amortization of deferred financing fees1,020 642 
Net foreign exchange loss/(gain)439 (45)
Accretion of rehabilitation provision (Note 17)155 191 
Gain on modification of Macquarie Credit Facility (Note 19)(2,973)— 
Variable adjustment component (Note 18)(1,534)(6,189)
Accretion of long-term receivables discount (Note 13)(220)— 
Interest income(289)(1,429)
9,463 4,615 
v3.21.1
INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2020
Incomes Taxes [Abstract]  
Summary of Deferred Tax Assets
Our net deferred tax liabilities at December 31, 2020 and 2019 include the following components:
December 31,
2020
December 31,
2019
Deferred tax assets  
Deductible temporary differences relating to provisions5,608 4,672 
Deferred tax liabilities
Mine property costs36,706 25,226 
Net deferred tax liabilities31,098 20,554 
The composition of our unrecognized deferred tax assets by tax jurisdiction is summarized as follows:
 December 31,
2020
December 31,
2019
Deductible temporary differences
Canada4,521 7,006 
Ghana824 1,859 
5,345 8,865 
Tax losses
Canada67,818 60,195 
Other2,396 334 
70,214 60,529 
Total unrecognized deferred tax assets
Canada72,339 67,201 
Ghana824 1,859 
Other2,396 334 
75,559 69,394 
Income Tax Recovery
The income tax expense includes the following components:
For the years ended
December 31,
 20202019
Current tax expense
Current tax on net earnings36,748 6,291 
Adjustments in respect to prior year973 — 
37,721 6,291 
Deferred tax expense
Originating and reversal of temporary differences in the current year10,545 21,148 
Income tax expense48,266 27,439 
Schedule of Expected Income Tax on Net Loss
A reconciliation of expected income tax on net loss before minority interest at statutory rates with the actual income tax expense is as follows:  
 For the Years Ended
December 31,
 20202019
Income from continuing operations before tax86,41937,427
Statutory tax rate26.5 %26.5 %
Tax benefit at statutory rate22,9019,918
Foreign tax rates17,2387,252
Permanent differences4511,880
Change in unrecognized deferred tax assets due to exchange rates(1,209)(2,424)
Change in unrecognized deferred tax assets8,88510,813
Income tax expense48,26627,439
v3.21.1
INCOME/(LOSS) PER COMMON SHARE (Tables)
12 Months Ended
Dec. 31, 2020
Earnings per share [abstract]  
Reconciliation between basic and diluted income/(loss) per common share
The following table provides a reconciliation between basic and diluted loss per common share:
For the Years Ended
December 31,
 20202019
Net income/(loss) attributable to Golden Star shareholders used in calculating basic income/(loss) per share:
From continuing operations38,518 5,317 
From discontinued operations (Note 5)(90,658)(72,751)
(52,140)(67,434)
Diluted income/(loss)
Net income from continuing operations attributable to Golden Star shareholders:
Used in calculating basic income/(loss) per share38,518 5,317 
Adjustments:
Interest expense on 7% Convertible Debentures
3,615 — 
Accretion of 7% Convertible Debentures discount (Note 10)
2,733 — 
Gain on fair value of 7% Convertible Debentures embedded derivative (Note 24)
(2,965)— 
Used in calculating diluted income/(loss) per share41,901 5,317 
Net loss from discontinued operations attributable to Golden Star Shareholders(90,658)(72,751)
Loss attributable to Golden Star shareholders used in calculating diluted income/(loss) per share(48,757)(67,434)
Weighted average number of basic shares (millions)110.3 109.0 
Dilutive securities:
Options0.1 0.8 
Deferred share units1.3 1.2 
Performance and restricted share units0.4 1.0 
UK performance share units1.3 — 
7% Convertible Debentures11.4 — 
Weighted average number of diluted shares (millions)124.8 112.0 
Basic income/(loss) per share
From continuing operations$0.35 $0.05 
From discontinued operations$(0.82)$(0.67)
Basic loss per share attributable to Golden Star shareholders$(0.47)$(0.62)
Diluted income/(loss) per share
From continuing operations$0.34 $0.05 
From discontinued operations$(0.82)$(0.67)
Diluted loss per share attributable to Golden Star shareholders$(0.47)$(0.62)
v3.21.1
ACCOUNTS AND OTHER RECEIVABLES (Tables)
12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Summary of accounts and other receivables
The following table summarizes the components of the Company's current and long-term accounts receivables:
As ofAs of
December 31,
2020
December 31, 2019
Current:
Deferred consideration for the sale of Prestea (Note 5)19,297 — 
Gold sales receivable174 1,206 
Indirect taxes1,579 3,649 
Other2,710 1,648 
23,759 6,503 
Long-term:
Deferred consideration for the sale of Prestea (Note 5)12,602 — 
12,602 — 
v3.21.1
INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2020
Classes of current inventories [abstract]  
Schedule of inventories
Inventories include the following components, net of provisions:
As ofAs of
December 31,
2020
December 31,
2019
Stockpiled ore6,706 7,578 
In-process ore1,057 2,721 
Finished goods449 394 
Materials and supplies22,388 28,167 
30,600 38,860 
v3.21.1
MINING INTERESTS (Tables)
12 Months Ended
Dec. 31, 2020
Property, plant and equipment [abstract]  
Summary of the cost, accumulated depreciation and net book value of plant and equipment, mining properties and construction in progress
The following table shows the breakdown of the cost, accumulated depreciation and net book value of plant and equipment, mining properties and construction in progress:
Plant and equipmentMining propertiesConstruction in progressTotal
Cost
As of December 31, 2018478,760 930,230 28,569 1,437,559 
Additions238 288 72,615 73,141 
Right of use asset additions2,631 — — 2,631 
Transfers11,586 71,337 (82,923)— 
Change in rehabilitation provision estimate— 4,830 — 4,830 
Disposals and other(621)— — (621)
Balance at December 31, 2019492,594 1,006,685 18,261 1,517,540 
Additions69 — 52,151 52,220 
Right of use asset additions599 — — 599 
Transfers22,526 39,602 (62,128)— 
Change in rehabilitation provision estimate— 2,215 — 2,215 
Derecognized on sale of Prestea (Note 5)(226,396)(244,612)(4,598)(475,606)
Disposals and other(301)— — (301)
Balance at December 31, 2020289,091 803,890 3,686 1,096,667 
Accumulated depreciation
As of December 31, 2018432,799 734,120 — 1,166,919 
Depreciation and amortization10,582 19,044 — 29,626 
Disposals and other(456)— — (456)
Impairment charges7,338 49,424 — 56,762 
Balance at December 31, 2019450,263 802,588 — 1,252,851 
Depreciation and amortization11,986 17,596 — 29,582 
Derecognized on sale of Prestea (Note 5)(210,594)(182,364)— (392,958)
Disposals and other(220)— — (220)
Balance at December 31, 2020251,435 637,820 — 889,255 
Carrying amount
Balance at December 31, 201942,331 204,097 18,261 264,689 
Balance at December 31, 202037,656 166,070 3,686 207,412 
Disclosure of detailed information about split of additions to mining interests
Additions to mining interests are presented inclusive of discontinued operations, whereas additions per the consolidated statement of cash flows and the segment information (Note 6) are presented excluding discontinued operations. The following table presents the split of additions:
Year ended December 31, 2020Year ended December 31, 2019
Continuing operations45,224 60,123 
Discontinued operations6,996 13,018 
52,220 73,141 
v3.21.1
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Tables)
12 Months Ended
Dec. 31, 2020
Trade and other current payables [abstract]  
Schedule of accounts payable and accrued liabilities
Accounts payable and accrued liabilities include the following components:
As ofAs of
December 31,
2020
December 31,
2019
Trade and other payables20,026 42,232 
Accrued liabilities 14,137 35,921 
Payroll-related liabilities4,917 7,780 
Accrued interest payable2,217 2,435 
41,297 88,368 
v3.21.1
REHABILITATION PROVISIONS (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of other provisions [abstract]  
Schedule of changes in the carrying amount of rehabilitation provisions The changes in the carrying amount of the rehabilitation provisions are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance68,435 66,225 
Accretion of rehabilitation provisions (Note 10)444 730 
Changes in estimates4,188 4,651 
Cost of reclamation work performed(2,632)(3,171)
Derecognized on sale of Prestea (Note 5)(52,867)— 
Balance at the end of the period17,568 68,435 
Current portion2,018 5,826 
Long term portion15,550 62,609 
17,568 68,435 
v3.21.1
DEFERRED REVENUE (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure Of Deferred Revenue [Abstract]  
Schedule of deferred revenue
The changes in the carrying value of deferred revenue are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance113,975 119,948 
Deferred revenue recognized before cumulative catch-up adjustment(9,804)(13,334)
Variable consideration adjustment6,437 3,073 
Interest on financing component of deferred revenue (Note 10)3,026 4,288 
Derecognized on sale of Prestea (Note 5)(9,072)— 
Balance at the end of the period104,562 113,975 
Current portion7,646 11,191 
Long term portion96,916 102,784 
Total104,562 113,975 
v3.21.1
DEBT (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of detailed information about borrowings [abstract]  
Disclosure of detailed information about borrowings
The following table summarizes the components of the Company's current and long-term debt:
As ofAs of
December 31,
2020
December 31, 2019
Current debt:
Lease liabilities296 987 
7% Convertible Debentures
49,735 — 
Macquarie Credit Facility— 15,000 
50,031 15,987 
Long-term debt:
Lease liabilities1,185 1,394 
7% Convertible Debentures
— 47,002 
Macquarie Credit Facility54,547 42,386 
55,732 90,782 
Schedule of changes in borrowings
The changes in the carrying amount of the 7% Convertible Debentures are as follows:
For the Year Ended December 31, 2020For the Year Ended December 31, 2019
Beginning balance47,002 44,612 
Accretion of 7% Convertible Debentures discount (Note 10)
2,733 2,390 
Balance at the end of the period49,735 47,002 
Schedule of payments on outstanding debt
Schedule of payments on outstanding debt as of December 31, 2020:
Year ending December 31, 2021Year ending December 31, 2022Year ending December 31, 2023Year ending December 31, 2024Year ending December 31, 2025Maturity
Lease liabilities
Principal297 303 303 323 255 2025
Interest81 62 43 24 
7% Convertible Debentures
Principal51,498 — — — — 2021
Interest3,605 — — — — 
Macquarie Credit Facility
Principal— 20,000 40,000 — — 2023
Interest2,831 2,595 1,936 — — 
Total principal51,795 20,303 40,303 323 255 
Total interest6,517 2,657 1,979 24 
58,312 22,960 42,282 347 259 
v3.21.1
SHARE CAPITAL (Tables)
12 Months Ended
Dec. 31, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]  
Schedule of changes in share capital
Number of Common SharesShare Capital
Balance at December 31, 2018108,819,009 908,035 
Issued on exercise of DSUs437,772 2,054 
Issued on exercise of stock options128,282 116 
Balance at December 31, 2019109,385,063 910,205 
Issued on exercise of DSUs135,557 176 
Issued on exercise of stock options1,711,680 7,376 
Issued on settlement of PRSUs, net of tax81,295 256 
Balance at December 31, 2020111,313,595 918,013 
v3.21.1
SHARE-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2020
Share-Based Payment Arrangements [Abstract]  
Non-cash employee compensation expenses recognized in general and administrative expense in the Statements of Operations and Comprehensive Income
Share-based compensation expenses recognized in the consolidated statements of operations include the following components:
For the Years Ended December 31,
 20202019
Stock options438 1,890 
Deferred share units518 689 
Share appreciation rights35 (52)
Performance and restricted share units394 592 
UK performance share units1,610 — 
2,995 3,119 
Fair value assumptions estimated at the grant dates using the Black-Scholes option-pricing model Fair values of stock options granted during the year ended December 31, 2020 and 2019 were based on the weighted average assumptions noted in the following table:
For the Years Ended
December 31,
 20202019
Expected volatility56.69%51.20%
Risk-free interest rate1.41%1.73%
Expected lives1.1 years5.7 years
Schedule of number and weighted average remaining contractual life of outstanding share options
A summary of stock option activity under the Company's Stock Option Plan during the year ended December 31, 2020 is as follows: 
Options




('000)
Weighted–
average
exercise
price

(CAD$)
Weighted–
average
remaining
contractual
life 
(Years)
Outstanding as of December 31, 20183,498 5.28 6.3
Granted806 5.21 9.2
Exercised(438)3.82 7.3
Forfeited(35)5.49 7.7
Expired(55)8.50 0
Outstanding as of December 31, 20193,776 5.39 4.7
Granted57 3.99 9.2
Exercised(1,712)3.68 6.0
Forfeited(574)6.03 4.0
Expired(698)7.94 0
Outstanding as of December 31, 2020849 6.21 5.3
Exercisable as of December 31, 20193,320 5.41 4.1
Exercisable as of December 31, 2020711 6.40 4.7
Schedule of range of exercise prices of outstanding share options
The number of stock options outstanding by strike price as of December 31, 2020 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2020Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2020Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
3.51 to 4.50
137 3.14.31 131 4.32 
4.51 to 5.50
432 7.75.14 306 5.09 
5.51 to 7.50
116 4.26.41 110 6.46 
7.51 to 10.50
121 1.89.36 121 9.36 
10.51 to 14.15
43 0.313.59 43 13.59 
849 5.36.21 711 6.40 
The number of stock options outstanding by strike price as of December 31, 2019 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2019Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2019Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
1.50 to 2.50
581 3.71.90 581 1.90 
2.51 to 3.50
373 5.72.82 373 2.82 
3.51 to 4.50
605 3.04.34 588 4.35 
4.51 to 5.50
1,187 7.35.03 782 4.96 
5.51 to 7.50
482 4.66.46 448 6.47 
7.51 to 10.50
322 2.09.67 322 9.67 
10.51 to 17.65
226 0.614.92 226 14.92 
3,776 4.75.39 3,320 5.41 
Summary of other equity activity
The DSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of DSUs, beginning of period ('000)1,274 1,086 
Granted214 188 
Exercised(136)— 
Forfeited(30)— 
Number of DSUs, end of period ('000)1,322 1,274 
The SARs activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of SARs, beginning of period ('000)593 674 
Granted240 285 
Exercised(225)(203)
Forfeited(57)(160)
Expired(113)(3)
Number of SARs, end of period ('000)438 593 
The PRSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of PRSUs, beginning of period ('000)634 791 
Granted— 561 
Settled(95)(324)
Forfeited(329)(394)
Number of PRSUs, end of period ('000)210 634 
A summary of the PSU activity during the year ended December 31, 2020 and 2019:
For the Years Ended December 31,
20202019
Number of PSUs, beginning of period ('000)— 1,173 
Settled— (1,173)
Number of PSUs, end of period ('000)— — 
The UK PSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of UK PSUs, beginning of period ('000)— — 
Granted1,555 — 
Settled— — 
Forfeited— — 
Number of UK PSUs, end of period ('000)1,555 — 
v3.21.1
RELATED PARTY TRANSACTIONS (Tables)
12 Months Ended
Dec. 31, 2020
Related Party [Abstract]  
Compensation of key management personnel Compensation of key management personnel is as follows:
For the Years Ended
December 31,
 20202019
Salaries, wages, and other benefits4,282 5,469 
Bonuses1,895 1,947 
Share-based compensation2,313 2,547 
8,490 9,963 
v3.21.1
PRINCIPAL SUBSIDIARY INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
Interests In Other Entities [Abstract]  
Schedule of subsidiaries
Summarized statement of financial position
WassaPrestea
As of December 31,As of December 31,
2020201920202019
Non-controlling interest percentage10 %10 %10 %10 %
Current assets77,835 142,603 — 14,623 
Current liabilities116,469 163,640 — 1,267,815 
(38,634)(21,037)— (1,253,192)
Non-current assets206,950 182,982 — 79,788 
Non-current liabilities46,648 37,327 — 45,871 
160,302 145,655 — 33,917 
Net assets/(liabilities)121,668 124,618 — (1,219,275)
Non-controlling interest19,911 20,275 — (102,788)
Summarized income statement
WassaPrestea
For the Years EndedFor the Periods Ended
December 31, 2020December 31, 2019September 30, 2020December 31, 2019
Revenue297,468 216,678 37,959 66,820 
Net (loss)/income and comprehensive (loss)/income(3,654)46,691 342,238 (152,106)
The net loss for the year ended December 31, 2020 for Wassa includes the write-off of intercompany loan receivables from Prestea of $93.7 million agreed as part of the sale of Prestea. Concurrently, the net income for the period ended September 30, 2020 for Prestea includes the forgiveness of intercompany loans payable to Golden Star and its subsidiaries of $390.6 million agreed as part of the sale of Prestea.
Summarized cash flows
WassaPrestea
For the Years EndedFor the Periods Ended
December 31, 2020December 31, 2019September 30, 2020December 31, 2019
Cash flows provided by/(used in) operating activities132,659 78,809 (17,738)(88,883)
Cash flows used in investing activities(47,258)(49,622)(5,785)(10,685)
Cash flows (used in)/provided by financing activities(55,516)(26,993)23,314 98,994 
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Financial Instruments [Abstract]  
Disclosure of financial liabilities
The following table illustrates the classification of the Company's recurring fair value measurements for derivative financial instruments within the fair value hierarchy and their carrying values and fair values as at December 31, 2020 and December 31, 2019:
December 31, 2020December 31, 2019
 LevelCarrying valueFair valueCarrying valueFair value
Financial liabilities
Fair value through profit or loss
7% Convertible Debentures embedded derivative (Note 19)
32,643 2,643 5,608 5,608 
Non-hedge derivative contracts22,382 2,382 211 211 
5,025 5,025 5,819 5,819 
Disclosure of gain (loss) on fair value of financial instruments The following table provides a reconciliation of derivative liability opening and closing balances as presented on the consolidated balance sheets:
For the Years Ended
December 31,
 20202019
Opening balance5,819 4,177 
(Gain)/loss on fair value of 7% Convertible Debentures embedded derivative(2,965)1,431 
Unrealized loss on fair value of non-hedge derivative contracts2,171 211 
(Gain)/loss on fair value of derivative financial instruments(794)1,642 
Closing balance5,025 5,819 
Current portion of derivative liability:
7% Convertible Debentures embedded derivative
2,643 — 
Non-hedge derivative contracts669 211 
3,312 211 
Long term portion of derivative liability:
7% Convertible Debentures embedded derivative— 5,608 
Non-hedge derivative contracts1,713 — 
1,713 5,608 
Disclosure of significant unobservable inputs used in fair value measurement of liabilities The significant inputs used in the convertible note valuation are as follows:
 December 31, 2020December 31, 2019
Embedded derivative
Risk premium5.9 %5.3 %
Borrowing costs7.5 %7.5 %
Expected volatility45.0 %45.0 %
Remaining life (years)0.61.6
v3.21.1
FINANCIAL RISK MANAGEMENT (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of general information about financial statements [Abstract]  
Schedule Of Contractual Obligations
The following table shows our contractual obligations as at December 31, 2020:
 Payment due by period 
 (Stated in thousands of U.S dollars)Less than 1
Year 
1 to 3 years 4 to 5 years  More than
5 Years 
Total 
Accounts payable and accrued liabilities
41,297 — — — 41,297 
Debt1
51,498 60,000 — — 111,498 
Lease liabilities297 606 578 — 1,481 
Interest on debt and lease liabilities6,517 4,636 28 — 11,181 
Current income tax liabilities12,774 — — — 12,774 
Purchase obligations10,109 — — — 10,109 
Rehabilitation provisions2
2,024 10,136 4,778 813 17,751 
Total124,516 75,378 5,384 813 206,091 
1     Includes the outstanding repayment amounts from the 7% Convertible Debentures maturing on August 15, 2021 and the Macquarie Credit Facility.
2    Rehabilitation provisions indicates the expected undiscounted cash flows for each period.
Summary of capital risk
As ofAs of
December 31,
2020
December 31,
2019
Equity/(deficiency)25,774 (32,123)
Long-term debt55,732 90,782 
81,506 58,659 
Cash and cash equivalents(60,809)(53,367)
20,697 5,292 
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
Statement of cash flows [abstract]  
Schedule of supplemental cash flow information
Changes in working capital and taxes paid for the years ended December 31, 2020 and 2019 are as follows:
For the Years Ended
December 31,
20202019
Increase in prepaids and other(4,069)(1,230)
Increase in inventories(899)(2,261)
Increase in accounts receivable and other receivables(319)(2,108)
Decrease in other liability— (6,410)
Increase in accounts payable and accrued liabilities1,578 9,069 
Total changes in working capital(3,709)(2,940)
Income tax liabilities paid(25,759)(5,469)
Total changes in working capital and taxes paid(29,468)(8,409)
Other non-cash items include the following components:
For the Years Ended
December 31,
20202019
Variable consideration adjustment (Note 18)6,437 3,073 
Interest on financing component of deferred revenue (Note 10)3,026 4,288 
Accretion of 7% Convertible Debentures discount (Note 10)2,733 2,390 
Amortization of financing fees (Note 10)1,020 642 
Inventory write-off176 — 
Accretion of rehabilitation provisions (Note 10)155 191 
Interest on lease obligations98 22 
Loss/(gain) on disposal of assets40 (13)
Loss on fair value of marketable securities14 
PRSU settlement, net of tax— (349)
Accretion of long-term receivables discount (Note 10)(220)— 
Gain on modification of Macquarie credit facility (Note 19)(2,973)— 
10,506 10,253 
Reconciliation of debt arising from financing activities during the years ended December 31, 2020 and 2019:
Lease liabilitiesEcobank Loan IIIEcobank Loan IVVendor Agreement
7% Convertible Debentures
Macquarie Credit FacilityTotal
December 31, 20181,683 19,935 17,700 16,776 44,612 — 100,706 
Cash flows
Proceeds from debt agreements— — — — — 60,000 60,000 
Capitalized loan fees— — — — — (2,614)(2,614)
Principal payments on debt facilities(20,277)(18,000)(17,507)— — (55,784)
Principal payments on lease liabilities(1,416)— — — — — (1,416)
Principal payments on lease liabilities (discontinued operations)(25)— — — — — (25)
Non-cash changes
Additions to lease liabilities2,116 — — — — — 2,116 
Accretion of debt23 342 300 731 2,390 — 3,786 
December 31, 20192,381 — — — 47,002 57,386 106,769 
Cash flows
Proceeds from debt modification— — — — — 10,000 10,000 
Capitalized loan fees— — — — — (886)(886)
Principal payments on debt facilities— — — — — (10,000)(10,000)
Principal payments on lease liabilities(1,694)— — — — — (1,694)
Principal payments on lease liabilities (discontinued operations)(20)— — — — — (20)
Non-cash changes
Gain on modification of credit facility— — — — — (2,973)(2,973)
Amortization of deferred financing fees— — — — — 1,020 1,020 
Additions to lease liabilities599 — — — — — 599 
Accretion of debt98 — — — 2,733 — 2,831 
Foreign exchange loss132 — — — — — 132 
Derecognized on the sale of Prestea (Note 5)(15)— — — — — (15)
December 31, 20201,481 — — — 49,735 54,547 105,763 
v3.21.1
NATURE OF OPERATIONS (Details)
12 Months Ended
Dec. 31, 2020
Golden Star Limited  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 90.00%
v3.21.1
BASIS OF PRESENTATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
[1],[2]
Dec. 31, 2018
[2]
Assets [abstract]      
Cash and cash equivalents $ 60,809 $ 53,367 $ 96,507
Net current assets excluding deferred revenue and derivative liability 15,600    
Cash flows from (used in) operations before changes in working capital $ 113,500    
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SUMMARY OF ACCOUNTING POLICIES - Property, plant and equipment (Details)
12 Months Ended
Dec. 31, 2020
Mobile Mining Equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Property, plant and equipment, useful life 5 years
v3.21.1
SUMMARY OF ACCOUNTING POLICIES - Share-based compensation (Details)
12 Months Ended
Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Award requisite service period 4 years
Performance share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Share conversion ratio 1
Award requisite service period 3 years
Performance and restricted share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Share conversion ratio 1
Award requisite service period 3 years
UK performance share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Share conversion ratio 1
Award requisite service period 3 years
Minimum | Performance and restricted share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Performance adjustment factor 0.00%
Minimum | UK performance share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Performance adjustment factor 0.00%
Maximum | Performance and restricted share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Performance adjustment factor 200.00%
Maximum | UK performance share units  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Performance adjustment factor 200.00%
v3.21.1
SUMMARY OF ACCOUNTING POLICIES - Financial Instruments (Details)
Dec. 31, 2020
Oct. 09, 2020
Aug. 03, 2016
7% Convertible Debentures      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 7.00% 7.00% 7.00%
v3.21.1
SALE OF PRESTEA - Narratives (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended 68 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
oz
tranche
Jul. 26, 2020
May 31, 2015
oz
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
oz
Dec. 31, 2020
oz
Prestea Cash Generating Unit                
Disclosure of analysis of single amount of discontinued operations [line items]                
Recoverable amount of CGU             $ 0  
Impairment charges             $ 56,800  
Price per ounce of gold | oz             1,400  
Discount rate             7.00%  
Life of mine             7 years  
Streaming Agreement                
Disclosure of analysis of single amount of discontinued operations [line items]                
Production delivery percentage   0.055   0.105   0.055    
Cash purchase price as a percentage of spot gold   0.20   0.20   0.30    
Gold delivered to date through Streaming Agreement (in ounces) | oz   240,000   240,000       119,997
Discontinued operations                
Disclosure of analysis of single amount of discontinued operations [line items]                
Impairment charges           $ 0 $ 56,762  
Prestea                
Disclosure of analysis of single amount of discontinued operations [line items]                
Proportion of ownership interest in subsidiary         90.00%      
Prestea | Discontinued operations                
Disclosure of analysis of single amount of discontinued operations [line items]                
Proportion of ownership interest in subsidiary     90.00%          
Sale of proportion of ownership interest in subsidiary   90.00%            
Deferred consideration   $ 34,300            
Deferred consideration, first installment   5,000            
Deferred consideration, second installment $ 4,300 10,000            
Deferred consideration, third installment   15,000            
Contingent consideration receivable   $ 40,000     $ 40,000      
Contingent consideration receivable, triggering event, percent of sulfide mineral resources extracted   5.00%            
Contingent consideration receivable, triggering event, amount of sulfide mineral resources extracted | oz   1,760,000            
Contingent consideration receivable, triggering event, amount of inferred resources | oz   70,000.00            
Quantum of contingent payment if the average spot gold price is less than or equal to $1,400 per ounce   $ 20,000            
Quantum of contingent payment if the average spot gold price is greater than $1,400/oz but less than or equal to $1,700/oz   30,000            
Quantum of contingent payment, if the average spot gold price is greater than $1,700/oz.   $ 40,000            
Contingent consideration receivable, number of tranches | tranche   2            
Contingent consideration receivable, percent received in tranche one   50.00%            
Declaration percentage of the sulfide mineral resources have been extracted for tranche one   5.00%            
Contingent consideration receivable, percent receivable in trance two   50.00%            
Declaration percentage of the sulfide mineral resources have been extracted for tranche two   5.00%            
Contingent consideration received   $ 0            
Transition and transaction related expenses             $ 3,300  
Prestea | Discontinued operations | Minimum                
Disclosure of analysis of single amount of discontinued operations [line items]                
Average spot gold price ($/oz) | oz   1,400            
Prestea | Discontinued operations | Maximum                
Disclosure of analysis of single amount of discontinued operations [line items]                
Average spot gold price ($/oz) | oz   1,700            
Prestea | Discontinued operations | Weighted average cost of capital, measurement input                
Disclosure of analysis of single amount of discontinued operations [line items]                
Significant unobservable input, assets   0.07     0.07      
Prestea | Discontinued operations | Minimum | Minimum                
Disclosure of analysis of single amount of discontinued operations [line items]                
Average spot gold price ($/oz) | oz   1,400            
Prestea | Discontinued operations | Maximum | Maximum                
Disclosure of analysis of single amount of discontinued operations [line items]                
Average spot gold price ($/oz) | oz   1,700            
v3.21.1
SALE OF PRESTEA - Net carrying amount of assets and liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash and cash equivalents   $ 60,809 $ 53,367 [1],[2] $ 96,507 [2]
Accounts receivable   12,602 0  
Total assets   343,861 372,608 [1]  
Rehabilitation provisions   (17,568) (68,435) (66,225)
Deferred revenue   (104,562) (113,975) $ (119,948)
Total Liabilities   (318,087) (404,731) [1]  
Derecognition of non-controlling interest   68,565    
Discontinued operations        
Disclosure of analysis of single amount of discontinued operations [line items]        
Cash and cash equivalents $ 1,692      
Accounts receivable 1,727      
Inventories 12,653      
Prepaids and other 1,399      
Restricted cash 991      
Mining interests 82,648      
Total assets 101,110      
Accounts payable (39,475)      
Rehabilitation provisions (52,867)      
Deferred revenue (9,072)      
Debt (15)      
Total Liabilities (101,429)      
Carrying value of net liabilities (319)      
Fair value of deferred consideration (Note 13) 31,679      
Gain on sale of Prestea before non-controlling interest 31,998      
Derecognition of non-controlling interest (68,565)      
Loss on sale of Prestea $ (36,567) $ 36,567 $ 0  
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SALE OF PRESTEA - Income (loss) form discontinued operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disclosure of analysis of single amount of discontinued operations [line items]      
Revenue   $ 272,481 $ 203,820 [1],[2]
Cost of sales excluding depreciation and amortization   124,422 110,123 [1],[2]
Depreciation and amortization   23,727 17,134 [1],[2]
Mine operating loss   124,332 76,563 [1],[2]
Prestea general and administrative expense   18,718 14,679 [1],[2]
Other expense, net   4,849 11,887 [1],[2]
Income before finance and tax   95,882 42,042 [1],[2]
Finance expense, net   9,463 4,615 [1],[2]
Net loss from discontinued operations   (56,434) (87,962) [1],[2]
Net income/(loss) and comprehensive loss from discontinued operations attributable to non-controlling interest   34,224 (15,211)
Net loss and comprehensive loss from discontinued operations attributable to Golden Star shareholders   (90,658) (72,751)
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Revenue   35,731 60,917
Cost of sales excluding depreciation and amortization   44,637 76,217
Depreciation and amortization   5,249 11,920
Mine operating loss   (14,155) (27,220)
Prestea general and administrative expense   1,050 1,293
Other expense, net   (4,904) (322)
Impairment charges   0 56,762
Loss on sale of Prestea $ (36,567) 36,567 0
Income before finance and tax   (56,676) (84,953)
Finance expense, net   $ (242) $ 3,009
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SALE OF PRESTEA - Net cash provided by (used in) discontinued operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Detailed Information Of Non-Current Assets Held For Sale And Discontinued Operations [Abstract]    
Net cash used in operating activities $ (23,915) $ (27,280) [1]
Net cash used in investing activities (7,475) (10,923) [1]
Net cash used in financing activities (20) (25) [1]
Net cash used by discontinued operations $ (31,410) $ (38,228)
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SEGMENTED INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Revenue $ 272,481 $ 203,820 [1],[2]
Mine operating expenses 107,400 98,722
Severance charges 45 225
Operating costs from metal inventory 1,918 299
Inventory write-off 176 0
Royalties 14,883 10,877
Cost of sales excluding depreciation and amortization 124,422 110,123 [1],[2]
Depreciation and amortization 23,727 17,134 [1],[2]
Mine operating profit 124,332 76,563 [1],[2]
Income tax expense 48,266 27,439 [1],[2],[3]
Income tax expense 36,748 6,291
Net loss from continuing operations attributable to non-controlling interest (365) 4,671
Net income/(loss) from continuing operations attributable to Golden Star 38,518 5,317
Capital expenditures 45,224  
Total assets 343,861 372,608 [4]
Operating segments | Wassa    
Disclosure of operating segments [line items]    
Revenue 272,481 203,820
Mine operating expenses 107,400 98,722
Severance charges 45 225
Operating costs from metal inventory 1,918 299
Inventory write-off 176  
Royalties 14,883 10,877
Cost of sales excluding depreciation and amortization 124,422 110,123
Depreciation and amortization 23,727 17,134
Mine operating profit 124,332 76,563
Income tax expense 48,266 27,439
Net loss from continuing operations attributable to non-controlling interest (365) 4,671
Net income/(loss) from continuing operations attributable to Golden Star 71,213 35,357
Capital expenditures 45,155 60,123
Total assets 285,573 232,182
Operating segments | Other    
Disclosure of operating segments [line items]    
Revenue 0 0
Mine operating expenses 0 0
Severance charges 0 0
Operating costs from metal inventory 0 0
Inventory write-off 0  
Royalties 0 0
Cost of sales excluding depreciation and amortization 0 0
Depreciation and amortization 0 0
Mine operating profit 0 0
Income tax expense 0 0
Net loss from continuing operations attributable to non-controlling interest 0 0
Net income/(loss) from continuing operations attributable to Golden Star (1,153) 1,190
Capital expenditures 0 0
Total assets 378 2,951
Operating segments | Prestea    
Disclosure of operating segments [line items]    
Capital expenditures 6,996 13,018
Total assets 0 94,453
Corporate    
Disclosure of operating segments [line items]    
Revenue 0 0
Mine operating expenses 0 0
Severance charges 0 0
Operating costs from metal inventory 0 0
Inventory write-off 0  
Royalties 0 0
Cost of sales excluding depreciation and amortization 0 0
Depreciation and amortization 0 0
Mine operating profit 0 0
Income tax expense 0 0
Net loss from continuing operations attributable to non-controlling interest 0 0
Net income/(loss) from continuing operations attributable to Golden Star (31,542) (31,230)
Capital expenditures 69 0
Total assets $ 57,910 $ 43,022
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[4] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
REVENUE (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2015
Dec. 31, 2020
Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Deferred revenue recognized   $ 8,662 $ 10,220 [1]
Variable consideration adjustment (Note 18)   6,437 3,073
Revenue   $ 272,481 $ 203,820 [2],[3]
Gold Production, Sale Location | SOUTH AFRICA      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Concentration risk percentage   90.00% 90.00%
Spot Sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue   $ 265,593 $ 194,626
Streaming Agreement      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Cash payment proceeds $ 145,000 6,197 4,610
Deferred revenue recognized   8,662 10,220
Variable consideration adjustment (Note 18)   (7,971) (5,636)
Revenue   $ 6,888 $ 9,193
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[2] Please refer to Note 28 for information on revised prior period comparatives.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Contractors $ 8,671 $ 11,133
Electricity 9,427 10,219
Fuel 5,449 5,744
Raw materials and consumables 22,217 17,702
Salaries and benefits 37,806 33,152
Maintenance parts and consumables 14,714 12,103
General and administrative overheads 7,714 8,023
Sales-related costs 1,402 646
Mine operating expenses 107,400 98,722
Severance charges 45 225
Operating costs to metal inventory 1,918 299
Inventory write-downs (Note 14) 176 0
Royalties 14,883 10,877
Cost of sales excluding depreciation and amortization $ 124,422 $ 110,123 [1],[2]
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
OTHER EXPENSE, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial liabilities [line items]    
Realized loss on non-hedge derivative contracts (Note 24) $ (794) $ 1,642 [1]
Corporate office relocation costs 407 7,221
Loss/(gain) on disposal of assets 40 (13)
Other expenses 1,926 4,679
Other operating income (expense) 4,849 11,887 [2],[3]
Non-hedge derivative contracts    
Disclosure of financial liabilities [line items]    
Realized loss on non-hedge derivative contracts (Note 24) $ 2,476 $ 0
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[2] Please refer to Note 28 for information on revised prior period comparatives.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
FINANCE EXPENSE, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 09, 2020
Oct. 17, 2019
Aug. 03, 2016
Disclosure of detailed information about borrowings [line items]          
Interest expense on principal debt $ 7,106 $ 4,767      
Interest on financing component of deferred revenue (Note 10) 3,026 4,288      
Accretion of 7% Convertible Debentures discount 2,831 3,786      
Amortization of deferred financing fees 1,020 642      
Net foreign exchange loss/(gain) 439 (45)      
Accretion of rehabilitation provision (Note 17) 155 191      
Gain on modification of Macquarie credit facility (Note 19) (2,973) 0      
Variable adjustment component (Note 18) (1,534) (6,189)      
Accretion of long-term receivables discount (Note 10) (220) 0      
Interest income (289) (1,429)      
Finance expense, net 9,463 4,615 [1],[2]      
Discontinued operations          
Disclosure of detailed information about borrowings [line items]          
Interest expense on principal debt   2,700      
Finance expense, net (242) 3,009      
7% Convertible Debentures          
Disclosure of detailed information about borrowings [line items]          
Accretion of 7% Convertible Debentures discount 2,733 $ 2,390      
Amortization of deferred financing fees 0        
Notional amount $ 51,500        
Borrowings, interest rate 7.00%   7.00%   7.00%
Senior Secured Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Notional amount       $ 60,000  
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
INCOME TAXES - Schedule of Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax (liabilities)/assets $ 31,098 $ 20,554 [1]
Deductible temporary differences relating to provisions    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 5,608 4,672
Mine property costs    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liabilities $ 36,706 $ 25,226
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
INCOME TAXES - Summary of Deferred Tax Asset Not Recognized (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Entity Location [Line Items]    
Deductible temporary differences $ 5,345 $ 8,865
Tax losses 70,214 60,529
Total unrecognized deferred tax assets 75,559 69,394
Tax pool 43,700  
Losses carryovers 246,700  
Canada    
Entity Location [Line Items]    
Deductible temporary differences 4,521 7,006
Tax losses 67,818 60,195
Total unrecognized deferred tax assets 72,339 67,201
Ghana    
Entity Location [Line Items]    
Deductible temporary differences 824 1,859
Total unrecognized deferred tax assets 824 1,859
Other    
Entity Location [Line Items]    
Tax losses 2,396 334
Total unrecognized deferred tax assets $ 2,396 $ 334
v3.21.1
INCOME TAXES - Income Tax Recovery Components (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 23, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense      
Current tax on net earnings   $ 36,748 $ 6,291
Adjustments in respect to prior year   973 0
Total current tax expense   37,721 6,291
Deferred tax expense      
Originating and reversal of temporary differences in the current year   10,545 21,148
Income tax expense   48,266 27,439 [1],[2],[3]
Income taxes paid $ 13,200 $ 25,800 $ 5,500
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
INCOME TAXES - Income Tax Recovery Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 23, 2021
Dec. 31, 2020
Dec. 31, 2019
Incomes Taxes [Abstract]      
Net loss before tax   $ 86,419 $ 37,427
Statutory tax rate   26.50% 26.50%
Tax benefit at statutory rate   $ 22,901 $ 9,918
Foreign tax rates   17,238 7,252
Permanent differences   451 1,880
Change in unrecognized deferred tax assets due to exchange rates   (1,209) (2,424)
Change in unrecognized deferred tax assets   8,885 10,813
Income tax expense   48,266 27,439 [1],[2],[3]
Wassa      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Cash tax exposure, effect of audit assessment     3,000
Ghana | Wassa      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Tax assessment reduction in tax losses   $ 4,000 $ 29,000
Tax losses carried forward | Wassa      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Reduction in attributable tax losses $ 4,000    
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
INCOME/(LOSS) PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 09, 2020
Aug. 03, 2016
Net income/(loss) attributable to Golden Star shareholders used in calculating basic income/(loss) per share:        
From continuing operations $ 38,518 $ 5,317    
From discontinued operations (Note 5) (90,658) (72,751)    
Net income/(loss) attributable to Golden Star shareholders used in calculating basic income/(loss) per share (52,140) (67,434)    
Net income from continuing operations attributable to Golden Star shareholders:        
Used in calculating basic income/(loss) per share 38,518 5,317    
Interest expense on 7% Convertible Debentures 3,615 0    
Accretion of 7% Convertible Debentures discount (Note 10) 2,733 0    
Gain on fair value of 7% Convertible Debentures embedded derivative (Note 24) (2,965) 0    
Used in calculating diluted income/(loss) per share 41,901 5,317    
Net loss from discontinued operations attributable to Golden Star Shareholders (90,658) (72,751)    
Loss attributable to Golden Star shareholders used in calculating diluted income/(loss) per share $ (48,757) $ (67,434)    
Weighted average shares outstanding-basic (in shares) 110,300,000 109,000,000.0    
Dilutive securities:        
Options (in shares) 100,000 800,000    
Deferred stock units (in shares) 1,300,000 1,200,000    
Performance and restricted share units (in shares) 400,000 1,000,000.0    
UK performance share units (in shares) 1,300,000 0    
Convertible Debentures (in shares) 11,400,000 0    
Weighted average shares outstanding-diluted (in shares) 124,800,000 112,000,000.0    
Basic income/(loss) per share        
Basic income/(loss) per share, continuing operations (USD per share) $ 0.35 $ 0.05 [1],[2]    
Basic income/(loss) per share from discontinued operations USD per share) (0.82) (0.67)    
Net loss per share attributable to Golden Star shareholders, basic (USD per share) (0.47) (0.62) [1],[2]    
Diluted income/(loss) per share        
Diluted income/(loss) per share from continuing operations (USD per share) 0.34 0.05 [1],[2]    
Diluted income/(loss) per share from discontinued operations, diluted (USD per share) (0.82) (0.67)    
Net loss per share attributable to Golden Star shareholders, diluted (USD per share) $ (0.47) $ (0.62) [1],[2]    
7% Convertible Debentures        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 7.00%   7.00% 7.00%
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
ACCOUNTS AND OTHER RECEIVABLES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Current:        
Deferred consideration for the sale of Prestea (Note 5) $ 19,297   $ 19,297 $ 0
Gold sales receivable 174   174 1,206
Indirect taxes 1,579   1,579 3,649
Other 2,710   2,710 1,648
Accounts and other current receivables 23,759   23,759 6,503 [1]
Long-term:        
Deferred consideration for the sale of Prestea (Note 5) 12,602   12,602 0
Accounts and other non-current receivables 12,602   12,602 0
Disclosure of analysis of single amount of discontinued operations [line items]        
Accretion of long-term receivables discount (Note 10)     $ 220 $ 0
Discontinued operations        
Long-term:        
Accounts and other non-current receivables   $ 1,727    
Discontinued operations | Prestea        
Disclosure of analysis of single amount of discontinued operations [line items]        
Deferred consideration, first installment   5,000    
Deferred consideration, second installment $ 4,300 $ 10,000    
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Classes of current inventories [abstract]    
Stockpiled ore $ 6,706 $ 7,578
In-process ore 1,057 2,721
Finished goods 449 394
Materials and supplies 22,388 28,167
Inventories 30,600 38,860 [1]
Cost of inventories expensed during period 109,500 99,200
Write-down of materials and supplies 200 $ 0
Finished goods inventory at net realisable value $ 400  
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
MINING INTERESTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period [1] $ 264,689  
Property, plant and equipment at end of period 207,412 $ 264,689 [1]
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,517,540 1,437,559
Additions 52,220 73,141
Right of use asset additions 599 2,631
Transfers 0 0
Change in rehabilitation provision estimate 2,215 4,830
Derecognized on sale of Prestea (Note 5) (475,606)  
Disposals and other (301) (621)
Property, plant and equipment at end of period 1,096,667 1,517,540
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (1,252,851) (1,166,919)
Derecognized on sale of Prestea (Note 5) 392,958  
Disposals and other 220 456
Depreciation and amortization 29,582 29,626
Impairment charges   56,762
Property, plant and equipment at end of period (889,255) (1,252,851)
Plant and equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 42,331  
Property, plant and equipment at end of period 37,656 42,331
Plant and equipment | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 492,594 478,760
Additions 69 238
Right of use asset additions 599 2,631
Transfers 22,526 11,586
Change in rehabilitation provision estimate 0 0
Derecognized on sale of Prestea (Note 5) (226,396)  
Disposals and other (301) (621)
Property, plant and equipment at end of period 289,091 492,594
Plant and equipment | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (450,263) (432,799)
Derecognized on sale of Prestea (Note 5) 210,594  
Disposals and other 220 456
Depreciation and amortization 11,986 10,582
Impairment charges   7,338
Property, plant and equipment at end of period (251,435) (450,263)
Mining properties    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 204,097  
Property, plant and equipment at end of period 166,070 204,097
Mining properties | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 1,006,685 930,230
Additions 0 288
Right of use asset additions 0 0
Transfers 39,602 71,337
Change in rehabilitation provision estimate 2,215 4,830
Derecognized on sale of Prestea (Note 5) (244,612)  
Disposals and other 0 0
Property, plant and equipment at end of period 803,890 1,006,685
Mining properties | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period (802,588) (734,120)
Derecognized on sale of Prestea (Note 5) 182,364  
Disposals and other 0 0
Depreciation and amortization 17,596 19,044
Impairment charges   49,424
Property, plant and equipment at end of period (637,820) (802,588)
Construction in progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 18,261  
Property, plant and equipment at end of period 3,686 18,261
Construction in progress | Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 18,261 28,569
Additions 52,151 72,615
Right of use asset additions 0 0
Transfers (62,128) (82,923)
Change in rehabilitation provision estimate 0 0
Derecognized on sale of Prestea (Note 5) (4,598)  
Disposals and other 0 0
Property, plant and equipment at end of period 3,686 18,261
Construction in progress | Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Property, plant and equipment at beginning of period 0 0
Derecognized on sale of Prestea (Note 5) 0  
Disposals and other 0 0
Depreciation and amortization 0 0
Impairment charges   0
Property, plant and equipment at end of period $ 0 $ 0
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
MINING INTERESTS - SPLIT OF ADDITIONS TO MINING INTERESTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Capital expenditures $ 45,224  
Right-of-use assets 2,700 $ 3,300
Aggregate continuing and discontinued operations    
Disclosure of detailed information about property, plant and equipment [line items]    
Capital expenditures 52,220 73,141
Operating segments | Wassa    
Disclosure of detailed information about property, plant and equipment [line items]    
Capital expenditures 45,155 60,123
Operating segments | Prestea    
Disclosure of detailed information about property, plant and equipment [line items]    
Capital expenditures $ 6,996 $ 13,018
v3.21.1
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade and other current payables [abstract]    
Trade and other payables $ 20,026 $ 42,232
Accrued liabilities 14,137 35,921
Payroll-related liabilities 4,917 7,780
Accrued interest payable 2,217 2,435
Accounts payable and accrued liabilities $ 41,297 $ 88,368 [1]
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
REHABILITATION PROVISIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Disclosure of financial liabilities [line items]          
Undiscounted amount of future cash flows     $ 17,751    
Risk premium rate assumption     5.00%   5.00%
Beginning balance $ 68,435 $ 66,225      
Accretion of rehabilitation provision (Note 17) 155 191      
Cost of reclamation work performed 1,233 1,202 [1]      
Derecognized on sale of Prestea (Note 5) (52,867) 0      
Balance at the end of the period 17,568 68,435      
Current portion     $ 2,018   $ 5,826 [2]
Long term portion     15,550   62,609 [2]
Total 68,435 68,435 17,568   $ 68,435
Aggregate continuing and discontinued operations          
Disclosure of financial liabilities [line items]          
Accretion of rehabilitation provision (Note 17) 444 730      
Changes in estimates 4,188 4,651      
Cost of reclamation work performed (2,632) (3,171)      
Discontinued operations          
Disclosure of financial liabilities [line items]          
Total       $ 52,867  
Non-Refractory Operation          
Disclosure of financial liabilities [line items]          
Changes in estimates 2,200 4,800      
Wassa          
Disclosure of financial liabilities [line items]          
Undiscounted amount of future cash flows     $ 17,800    
Accretion of rehabilitation provision (Note 17) 200        
Changes in estimates 900 1,600      
Cost of reclamation work performed (1,200) (1,200)      
Prestea          
Disclosure of financial liabilities [line items]          
Changes in estimates 3,300 3,100      
Prestea | Discontinued operations          
Disclosure of financial liabilities [line items]          
Accretion of rehabilitation provision (Note 17) 200        
Cost of reclamation work performed (1,400) (1,900)      
Prestea | Refractory Operations | Discontinued operations          
Disclosure of financial liabilities [line items]          
Changes in estimates $ 2,000 $ 200      
Provision for decommissioning, restoration and rehabilitation costs          
Disclosure of financial liabilities [line items]          
Discount rate assumption     0.30%   2.00%
Inflation rate assumption     1.70%   2.00%
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[2] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
DEFERRED REVENUE (Details)
$ in Thousands
1 Months Ended 12 Months Ended 68 Months Ended
Sep. 30, 2020
USD ($)
oz
May 31, 2015
USD ($)
oz
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2019
USD ($)
oz
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Deferred income, beginning balance     $ 113,975 $ 119,948      
Deferred revenue recognized before cumulative catch-up adjustment     (9,804) (13,334)      
Variable consideration adjustment     6,437 3,073      
Interest on financing component of deferred revenue (Note 10)     3,026 4,288      
Derecognized on sale of Prestea (Note 5)     (9,072) 0      
Deferred income, ending balance     104,562 113,975 $ 104,562    
Current portion           $ 7,646 $ 11,191 [1]
Long term portion           96,916 102,784 [1]
Total     $ 113,975 $ 113,975 $ 104,562 $ 104,562 $ 113,975
Gold sold (in ounces) | oz     19,816 21,720      
Adjustments for reduction in finance costs     $ (1,534) $ (6,189)      
Discontinued operations              
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Deferred income, ending balance $ 9,072            
Total $ 9,072            
Wassa              
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Cash payment proceeds     6,200 4,600      
Decrease through performance obligation being satisfied, contract liabilities     8,700 10,200      
Prestea | Discontinued operations              
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Cash payment proceeds     800 1,400      
Decrease through performance obligation being satisfied, contract liabilities     1,100 3,100      
Streaming Agreement              
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Cash payment proceeds   $ 145,000 $ 6,197 4,610      
Production delivery percentage 0.055 0.105 0.055        
Cash purchase price as a percentage of spot gold 0.20 0.20 0.30        
Gold delivered to date through Streaming Agreement (in ounces) | oz 240,000 240,000     119,997    
Variable consideration adjustment     $ 6,400 3,100      
Adjustments for reduction in revenue     8,000 9,300      
Adjustments for reduction in finance costs     $ 1,500 6,200      
Streaming Agreement | Discontinued operations              
Disclosure of disaggregation of revenue from contracts with customers [line items]              
Adjustments for reduction in revenue       $ 3,700      
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Oct. 09, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Disclosure of detailed information about borrowings [line items]          
Current portion $ 50,031   $ 15,987 [1]    
Long term portion 55,732   90,782 [1]    
Total 55,732   90,782    
Lease liabilities          
Disclosure of detailed information about borrowings [line items]          
Current portion 296   987    
Long term portion 1,185   1,394    
7% Convertible Debentures          
Disclosure of detailed information about borrowings [line items]          
Current portion 49,735   0    
Long term portion 0   47,002    
Total $ 49,735   47,002 $ 44,612  
Borrowings, interest rate 7.00% 7.00%     7.00%
Macquarie Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Current portion $ 0   15,000    
Long term portion $ 54,547   $ 42,386    
Total   $ 50,000      
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
DEBT - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 09, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Feb. 28, 2017
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 17, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 03, 2016
USD ($)
Disclosure of detailed information about borrowings [line items]                  
Borrowings         $ 55,732 $ 90,782      
Short term lease payments         1,700 1,400      
Principal payments on debt facilities         10,000 55,784 [1]      
Drawdown amount from debt           60,000      
Financial liabilities         $ 5,025 5,819   $ 4,177  
Debt Instrument Convertible Conversion Ratio         0.222        
Gain on modification of Macquarie credit facility (Note 19)         $ 2,973 0      
Equipment                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings         100 600      
Corporate office space                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings         $ 1,400 1,800      
Borrowings, term         5 years        
Macquarie Credit Facility                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings $ 50,000                
Notional amount 70,000       $ 60,000   $ 60,000    
Increase in borrowings 20,000                
Principal payments on debt facilities   $ 5,000 $ 5,000   10,000 0      
Additional borrowing 10,000                
Deferred quarterly repayments 5,000                
Bullet payment $ 25,000                
Drawdown amount from debt           60,000      
Gain on modification of Macquarie credit facility (Note 19)         3,000        
7% Convertible Debentures                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings         49,735 47,002   $ 44,612  
Notional amount         $ 51,500        
Borrowings, interest rate 7.00%       7.00%       7.00%
Principal payments on debt facilities         $ 0 0      
Drawdown amount from debt           0      
Notes and debentures issued                 $ 65,000
Number of trading days, consecutive days         30 days        
Percentage of conversion price in effect         130.00%        
Redemption price, percentage of principal         100.00%        
Other comprehensive income, net of tax, gains (losses) on revaluation         $ 3,000 (1,400)      
Convertible debt, conversion ratio       4.50          
5% Convertible Debentures                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate                 5.00%
Notes and debentures issued         42,000        
LIBOR | Macquarie Credit Facility | Floating interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate             4.50%    
7% Convertible Debentures embedded derivative                  
Disclosure of detailed information about borrowings [line items]                  
Financial liabilities         $ 2,600 $ 5,600      
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
DEBT - Schedule of changes in carrying amount of debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Beginning balance $ 90,782  
Accretion of 7% Convertible Debentures discount 2,831 $ 3,786
Balance at the end of the period 55,732 90,782
7% Convertible Debentures    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 47,002 44,612
Accretion of 7% Convertible Debentures discount 2,733 2,390
Balance at the end of the period $ 49,735 $ 47,002
v3.21.1
DEBT - Schedule of payments on outstanding debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Oct. 09, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]        
Debt $ 55,732   $ 90,782  
Year ending December 31, 2021        
Disclosure of detailed information about borrowings [line items]        
Debt 58,312      
Year ending December 31, 2021 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 51,795      
Year ending December 31, 2021 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 6,517      
Year ending December 31, 2022        
Disclosure of detailed information about borrowings [line items]        
Debt 22,960      
Year ending December 31, 2022 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 20,303      
Year ending December 31, 2022 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 2,657      
Year ending December 31, 2023        
Disclosure of detailed information about borrowings [line items]        
Debt 42,282      
Year ending December 31, 2023 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 40,303      
Year ending December 31, 2023 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 1,979      
Year ending December 31, 2024        
Disclosure of detailed information about borrowings [line items]        
Debt 347      
Year ending December 31, 2024 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 323      
Year ending December 31, 2024 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 24      
Year ending December 31, 2025        
Disclosure of detailed information about borrowings [line items]        
Debt 259      
Year ending December 31, 2025 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 255      
Year ending December 31, 2025 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 4      
Lease liabilities | Year ending December 31, 2021 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 297      
Lease liabilities | Year ending December 31, 2021 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 81      
Lease liabilities | Year ending December 31, 2022 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 303      
Lease liabilities | Year ending December 31, 2022 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 62      
Lease liabilities | Year ending December 31, 2023 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 303      
Lease liabilities | Year ending December 31, 2023 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 43      
Lease liabilities | Year ending December 31, 2024 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 323      
Lease liabilities | Year ending December 31, 2024 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 24      
Lease liabilities | Year ending December 31, 2025 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 255      
Lease liabilities | Year ending December 31, 2025 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 4      
7% Convertible Debentures        
Disclosure of detailed information about borrowings [line items]        
Debt 49,735   $ 47,002 $ 44,612
7% Convertible Debentures | Year ending December 31, 2021 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 51,498      
7% Convertible Debentures | Year ending December 31, 2021 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 3,605      
7% Convertible Debentures | Year ending December 31, 2022 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2022 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2023 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2023 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2024 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2024 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2025 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
7% Convertible Debentures | Year ending December 31, 2025 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
Macquarie Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Debt   $ 50,000    
Macquarie Credit Facility | Year ending December 31, 2021 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
Macquarie Credit Facility | Year ending December 31, 2021 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 2,831      
Macquarie Credit Facility | Year ending December 31, 2022 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 20,000      
Macquarie Credit Facility | Year ending December 31, 2022 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 2,595      
Macquarie Credit Facility | Year ending December 31, 2023 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 40,000      
Macquarie Credit Facility | Year ending December 31, 2023 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 1,936      
Macquarie Credit Facility | Year ending December 31, 2024 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
Macquarie Credit Facility | Year ending December 31, 2024 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
Macquarie Credit Facility | Year ending December 31, 2025 | Principal        
Disclosure of detailed information about borrowings [line items]        
Debt 0      
Macquarie Credit Facility | Year ending December 31, 2025 | Interest        
Disclosure of detailed information about borrowings [line items]        
Debt $ 0      
v3.21.1
SHARE CAPITAL (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Oct. 28, 2020
USD ($)
Reconciliation of number of shares outstanding [abstract]      
Shares issued under options (shares) | shares 1,712,000 438,000  
Balance at beginning of period $ (32,123) [1] $ 41,975  
Shares issued under DSUs (105)    
Shares issued under options 4,653 1,270  
Shares issued under PRSUs (40) (565)  
Balance at end of period $ 25,774 $ (32,123) [1]  
Common shares      
Reconciliation of number of shares outstanding [abstract]      
Authorized capital     $ 50,000
Share Capital   | Common shares      
Reconciliation of number of shares outstanding [abstract]      
Balance at beginning of period (shares) | shares 109,385,063 108,819,009  
Shares issued under DSUs (shares) | shares 135,557    
Shares issued under options (shares) | shares 1,711,680 437,772  
Shares issued under PRSUs (shares) | shares 81,295 128,282  
Balance at end of period (shares) | shares 111,313,595 109,385,063  
Balance at beginning of period $ 910,205 $ 908,035  
Shares issued under DSUs 176    
Shares issued under options 7,376 2,054  
Shares issued under PRSUs 256 116  
Balance at end of period $ 918,013 $ 910,205  
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
SHARE-BASED COMPENSATION - Employee compensation expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 2,995 $ 3,119 [1],[2]
General and administrative expense    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 2,995 3,119
General and administrative expense | Share options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 438 1,890
General and administrative expense | Deferred share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 518 689
General and administrative expense | Share appreciation rights    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 35 (52)
General and administrative expense | Performance and restricted share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense 394 592
General and administrative expense | UK performance share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense $ 1,610 $ 0
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SHARE-BASED COMPENSATION - Additional information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
May 04, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of shares authorised (in shares) | shares 7,000,000 7,000,000      
Granted (in shares) | shares 57,000   806,000    
Expiration period 10 years        
Award requisite service period 4 years        
Weighted average share price, share options granted (CAD per share) | $ / shares   $ 0.96   $ 2.55  
Future share-based compensation $ 100 $ 100 $ 500 $ 500  
Share-based compensation expense 2,995   3,119 [1],[2]    
Deferred share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Future share-based compensation $ 0 0      
Share appreciation rights          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award requisite service period 3 years        
Future share-based compensation $ 100 $ 100 100 $ 100  
Performance and restricted share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Number of instruments authorized to be granted (in shares) | shares         2,200,000
Number of instruments available to be granted (in shares) | shares 1,242,155 1,242,155      
Award requisite service period 3 years        
Share conversion ratio 1        
Performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award requisite service period 3 years        
Share conversion ratio 1        
UK performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Granted (in shares) | shares 4,568,506        
Award requisite service period 3 years        
Share conversion ratio 1        
Minimum | Performance and restricted share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 0.00%        
Minimum | Performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 0.00%        
Minimum | UK performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 0.00%        
Maximum | Performance and restricted share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 200.00%        
Maximum | Performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 200.00%        
Maximum | UK performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Award performance adjusting factor 200.00%        
General and administrative expense          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense $ 2,995   3,119    
General and administrative expense | Share options          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense 438   1,890    
General and administrative expense | Deferred share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense 518   689    
General and administrative expense | Share appreciation rights          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense 35   (52)    
General and administrative expense | Performance and restricted share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense 394   592    
General and administrative expense | UK performance share units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense $ 1,610   $ 0    
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SHARE-BASED COMPENSATION - Fair value assumptions for share options (Details) - year
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-Based Payment Arrangements [Abstract]    
Expected volatility 56.69% 51.20%
Risk-free interest rate 1.41% 1.73%
Expected lives (in years) 1.1 5.7
v3.21.1
SHARE-BASED COMPENSATION - Summary of option activity (Details)
12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Options      
Beginning balance outstanding (in shares) | shares 3,776,000 3,498,000  
Granted (in shares) | shares 57,000 806,000  
Exercised (in shares) | shares (1,712,000) (438,000)  
Forfeited (in shares) | shares (574,000) (35,000)  
Expired (in shares) | shares (698,000) (55,000)  
Ending balance outstanding (in shares) | shares 849,000 3,776,000 3,498,000
Options exercisable (in shares) | shares 711,000 3,320,000  
Weighted– Average Exercise price ($CAD)      
Beginning balance outstanding (in $CAD per share) | $ / shares $ 5.39 $ 5.28  
Granted (in $CAD per share) | $ / shares 3.99 5.21  
Excercised (in $CAD per share) | $ / shares 3.68 3.82  
Forfeited (in $CAD per share) | $ / shares 6.03 5.49  
Expired (in $CAD per share) | $ / shares 7.94 8.50  
Ending balance outstanding (in $CAD per share) | $ / shares 6.21 5.39 $ 5.28
Weighted Average Exercise price exercisable (in $CAD per share) | $ / shares $ 6.40 $ 5.41  
Weighted– Average Remaining Contractual Term (Years)      
Weighted-average remaining contractual life 5 years 3 months 18 days 4 years 8 months 12 days 6 years 3 months 18 days
Granted 9 years 2 months 12 days 9 years 2 months 12 days  
Exercised 6 years 7 years 3 months 18 days  
Forfeited 4 years 7 years 8 months 12 days  
Exercisable 4 years 8 months 12 days 4 years 1 month 6 days  
v3.21.1
SHARE-BASED COMPENSATION - Number of options outstanding by strike price (Details)
12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 849,000 3,776,000 3,498,000 849,000 3,776,000
Weighted-average remaining contractual life 5 years 3 months 18 days 4 years 8 months 12 days 6 years 3 months 18 days    
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 6.21 $ 5.39 $ 5.28    
Options exercisable, Number outstanding (in shares) | shares 711,000 3,320,000   711,000 3,320,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 6.40 $ 5.41      
1.50 to 2.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares   581,000     581,000
Weighted-average remaining contractual life   3 years 8 months 12 days      
Options outstanding, Weighted-average exercise price (in Cdn$ per share)   $ 1.90      
Options exercisable, Number outstanding (in shares) | shares   581,000     581,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share)   $ 1.90      
1.50 to 2.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 1.50
1.50 to 2.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 2.50
2.51 to 3.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares   373,000     373,000
Weighted-average remaining contractual life   5 years 8 months 12 days      
Options outstanding, Weighted-average exercise price (in Cdn$ per share)   $ 2.82      
Options exercisable, Number outstanding (in shares) | shares   373,000     373,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share)   $ 2.82      
2.51 to 3.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 2.51
2.51 to 3.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 3.50
3.51 to 4.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 137,000 605,000   137,000 605,000
Weighted-average remaining contractual life 3 years 1 month 6 days 3 years      
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 4.31 $ 4.34      
Options exercisable, Number outstanding (in shares) | shares 131,000 588,000   131,000 588,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 4.32 $ 4.35      
3.51 to 4.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 3.51 $ 3.51
3.51 to 4.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 4.50 $ 4.50
4.51 to 5.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 432,000 1,187,000   432,000 1,187,000
Weighted-average remaining contractual life 7 years 8 months 12 days 7 years 3 months 18 days      
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 5.14 $ 5.03      
Options exercisable, Number outstanding (in shares) | shares 306,000 782,000   306,000 782,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 5.09 $ 4.96      
4.51 to 5.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 4.51 $ 4.51
4.51 to 5.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 5.50 $ 5.50
5.51 to 7.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 116,000 482,000   116,000 482,000
Weighted-average remaining contractual life 4 years 2 months 12 days 4 years 7 months 6 days      
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 6.41 $ 6.46      
Options exercisable, Number outstanding (in shares) | shares 110,000 448,000   110,000 448,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 6.46 $ 6.47      
5.51 to 7.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 5.51 $ 5.51
5.51 to 7.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 7.50 $ 7.50
7.51 to 10.50          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 121,000 322,000   121,000 322,000
Weighted-average remaining contractual life 1 year 9 months 18 days 2 years      
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 9.36 $ 9.67      
Options exercisable, Number outstanding (in shares) | shares 121,000 322,000   121,000 322,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 9.36 $ 9.67      
7.51 to 10.50 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 7.51 $ 7.51
7.51 to 10.50 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 10.50 $ 10.50
10.51 to 14.15          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares 43,000     43,000  
Weighted-average remaining contractual life 3 months 18 days        
Options outstanding, Weighted-average exercise price (in Cdn$ per share) $ 13.59        
Options exercisable, Number outstanding (in shares) | shares 43,000     43,000  
Options exercisable, Weighted-average exercise price (in Cdn$ per share) $ 13.59        
10.51 to 14.15 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 10.51  
10.51 to 14.15 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)       $ 14.15  
10.51 to 17.65          
Disclosure of range of exercise prices of outstanding share options [line items]          
Options outstanding, Number outstanding (in shares) | shares   226,000     226,000
Weighted-average remaining contractual life   7 months 6 days      
Options outstanding, Weighted-average exercise price (in Cdn$ per share)   $ 14.92      
Options exercisable, Number outstanding (in shares) | shares   226,000     226,000
Options exercisable, Weighted-average exercise price (in Cdn$ per share)   $ 14.92      
10.51 to 17.65 | Minimum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 10.51
10.51 to 17.65 | Maximum          
Disclosure of range of exercise prices of outstanding share options [line items]          
Exercise price (in Cdn$ per share)         $ 17.65
v3.21.1
SHARE-BASED COMPENSATION - Summary of DSU activity (Details) - Deferred share units - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 1,274 1,086
Grants (in shares) 214 188
Exercises (in shares) (136) 0
Forfeited (in shares) (30) 0
Number of units, end of period (in shares) 1,322 1,274
v3.21.1
SHARE-BASED COMPENSATION - Summary of SAR activity (Details) - Share appreciation rights - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 593 674
Grants (in shares) 240 285
Exercises (in shares) (225) (203)
Forfeited (in shares) (57) (160)
Expired (in shares) (113) (3)
Number of units, end of period (in shares) 438 593
v3.21.1
SHARE-BASED COMPENSATION - Summary of PSU and PRSU activity (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Performance and restricted share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 634,000 791,000
Grants (in shares) 0 561,000
Settled (in shares) (95,000) (324,000)
Forfeited (in shares) (329,000) (394,000)
Number of units, end of period (in shares) 210,000 634,000
Performance share units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 0 1,173,000
Settled (in shares) 0 1,173,000
Number of units, end of period (in shares) 0 0
v3.21.1
SHARE-BASED COMPENSATION - Summary of UK PSU activity (Details) - UK performance share units - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units, beginning of period (in shares) 0 0
Grants (in shares) 1,555 0
Settled (in shares) 0 0
Forfeited (in shares) 0 0
Number of units, end of period (in shares) 1,555 0
v3.21.1
RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related Party [Abstract]    
Salaries, wages, and other benefits $ 4,282 $ 5,469
Bonuses 1,895 1,947
Share-based compensation 2,313 2,547
Key management personnel compensation $ 8,490 $ 9,963
v3.21.1
PRINCIPAL SUBSIDIARY INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Current assets   $ 121,716 $ 105,837 [1]
Current liabilities   117,078 122,394 [1]
Non-controlling interest   19,911 (82,513) [1]
Revenue   272,481 203,820 [2],[3]
Net (loss)/income and comprehensive (loss)/income   (18,281) (77,974) [2],[3]
Cash flows provided by/(used in) operating activities   60,089 22,841 [4]
Cash flows used in investing activities   (54,700) (67,411) [4]
Cash flows (used in)/provided by financing activities   $ 2,053 $ 1,430 [4]
Wassa      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary   90.00%  
Non-controlling interest percentage   10.00% 10.00%
Current assets   $ 77,835 $ 142,603
Current liabilities   116,469 163,640
Current assets (liabilities)   (38,634) (21,037)
Non-current assets   206,950 182,982
Non-current liabilities   46,648 37,327
Noncurrent Assets (Liabilities)   160,302 145,655
Net assets/(liabilities)   121,668 124,618
Non-controlling interest   19,911 20,275
Revenue   297,468 216,678
Net (loss)/income and comprehensive (loss)/income   (3,654) 46,691
Write-off of intercompany loans receivables   93,700  
Cash flows provided by/(used in) operating activities   132,659 78,809
Cash flows used in investing activities   (47,258) (49,622)
Cash flows (used in)/provided by financing activities   $ (55,516) $ (26,993)
Prestea      
Disclosure of subsidiaries [line items]      
Proportion of ownership interest in subsidiary 90.00%    
Non-controlling interest percentage   10.00% 10.00%
Current assets   $ 0 $ 14,623
Current liabilities   0 1,267,815
Current assets (liabilities)   0 (1,253,192)
Non-current assets   0 79,788
Non-current liabilities   0 45,871
Noncurrent Assets (Liabilities)   0 33,917
Net assets/(liabilities)   0 (1,219,275)
Non-controlling interest   0 (102,788)
Revenue   37,959 66,820
Net (loss)/income and comprehensive (loss)/income   342,238 (152,106)
Write-off of intercompany loans receivables   390,600  
Cash flows provided by/(used in) operating activities   (17,738) (88,883)
Cash flows used in investing activities   (5,785) (10,685)
Cash flows (used in)/provided by financing activities   $ 23,314 $ 98,994
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] Please refer to Note 28 for information on revised prior period comparatives.
[3] The results of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[4] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS - Fair value measurements for financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Oct. 09, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 03, 2016
Disclosure of financial liabilities [line items]          
Financial liabilities $ 5,025   $ 5,819 $ 4,177  
7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Borrowings, interest rate 7.00% 7.00%     7.00%
Carrying value          
Disclosure of financial liabilities [line items]          
Financial liabilities $ 5,025   5,819    
Carrying value | Level 3 | Convertible Debentures | 7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,643   5,608    
Carrying value | Level 2 | Non-hedge derivative contracts          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,382   211    
Fair value          
Disclosure of financial liabilities [line items]          
Financial liabilities 5,025   5,819    
Fair value | Level 3 | Convertible Debentures | 7% Convertible Debentures          
Disclosure of financial liabilities [line items]          
Financial liabilities 2,643   5,608    
Fair value | Level 2 | Non-hedge derivative contracts          
Disclosure of financial liabilities [line items]          
Financial liabilities $ 2,382   $ 211    
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS - (Gain)/loss on fair value of financial instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 09, 2020
Aug. 03, 2016
Disclosure of detailed information about financial instruments [line items]        
Opening balance $ 5,819 $ 4,177    
(Gain)/loss on fair value of derivative financial instruments (794) 1,642    
Closing balance 5,025 5,819    
Current financial liabilities 3,312 211    
Non-current financial liabilities 1,713 5,608    
7% Convertible Debentures        
Disclosure of detailed information about financial instruments [line items]        
(Gain)/loss on fair value of derivative financial instruments (2,965) 1,431    
Current financial liabilities 2,643 0    
Non-current financial liabilities $ 0 5,608    
Borrowings, interest rate 7.00%   7.00% 7.00%
Non-hedge derivative contracts        
Disclosure of detailed information about financial instruments [line items]        
(Gain)/loss on fair value of derivative financial instruments $ 2,171 211    
Current financial liabilities 669 211    
Non-current financial liabilities $ 1,713 $ 0    
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Oct. 31, 2020
oz
Feb. 29, 2020
oz
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2019
USD ($)
oz
Oct. 09, 2020
Aug. 03, 2016
Disclosure of detailed information about financial instruments [line items]              
Potential increase in fair value measurement of liability due to a change in borrowing costs       $ (40,000.00)      
Potential decrease in fair value measurement of liability due to a change in volatility       $ 590,000      
Price per ounce of gold | oz       1,891      
Realized loss on non-hedge derivative contracts       $ 794,000 $ (1,642,000) [1]    
(Gain)/loss on fair value of derivative financial instruments       (794,000) 1,642,000    
Total Liabilities       318,087,000 404,731,000 [2]    
Discontinued operations              
Disclosure of detailed information about financial instruments [line items]              
Total Liabilities $ 101,429,000            
Discontinued operations | Prestea              
Disclosure of detailed information about financial instruments [line items]              
Contingent consideration received $ 0            
Discontinued operations | Prestea | Contingent consideration              
Disclosure of detailed information about financial instruments [line items]              
Total Liabilities       $ 0      
7% Convertible Debentures              
Disclosure of detailed information about financial instruments [line items]              
Borrowings, interest rate       7.00%   7.00% 7.00%
Potential increase in fair value measurement of liability due to a change in risk premium       $ (10,000.00)      
(Gain)/loss on fair value of derivative financial instruments       $ (2,965,000) $ 1,431,000    
Non-hedge derivative contracts              
Disclosure of detailed information about financial instruments [line items]              
Amount of collar contracts | oz   87,500 4,200   50,000    
Maturity rate per quarter       10,937.5      
Realized loss on non-hedge derivative contracts       $ (2,476,000) $ 0    
(Gain)/loss on fair value of derivative financial instruments       $ 2,171,000 $ 211,000    
Non-hedge derivative contracts | Minimum              
Disclosure of detailed information about financial instruments [line items]              
Price per ounce of gold | oz   1,600 1,500   1,400    
Non-hedge derivative contracts | Maximum              
Disclosure of detailed information about financial instruments [line items]              
Price per ounce of gold | oz     1,992   1,750    
Non-Hedge Derivative Contracts Expiring 2021 | Maximum              
Disclosure of detailed information about financial instruments [line items]              
Price per ounce of gold | oz   2,176          
Non-Hedge Derivative Contracts Expiring 2022 | Maximum              
Disclosure of detailed information about financial instruments [line items]              
Price per ounce of gold | oz   2,188          
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
[2] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
DEIVATIVE FINANCIAL INSTRUMENTS - Fair Value Inputs (Details) - 7% Convertible Debentures embedded derivative
Dec. 31, 2020
Dec. 31, 2019
Risk premium    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]    
Significant unobservable input, liabilities 0.059 0.053
Borrowing costs    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]    
Significant unobservable input, liabilities 0.075 0.075
Expected volatility    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]    
Significant unobservable input, liabilities 0.450 0.450
Remaining life (years)    
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]    
Significant unobservable input, liabilities 0.6 1.6
v3.21.1
FINANCIAL RISK MANAGEMENT - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2019
USD ($)
Oct. 28, 2020
USD ($)
Oct. 09, 2020
USD ($)
Oct. 17, 2019
USD ($)
Dec. 31, 2018
USD ($)
Common shares            
Disclosure of financial liabilities [line items]            
Authorized capital     $ 50,000      
Debt instrument coverage ratio 1.20          
Debt instrument EBITDA ratio 3.00          
Aggregate indebtedness maximum $ 135,000          
Current assets 121,716 $ 105,837 [1]        
Current liabilities 117,078 122,394 [1]        
Cash and cash equivalents 60,809 53,367 [1],[2]       $ 96,507 [2]
Equity/(deficiency) 25,774 (32,123) [1]       $ 41,975
Long-term debt 55,732 90,782 [1]        
Equity and long term debt 81,506 58,659        
Equity and long term debt less cash and cash equivalents 20,697 5,292        
Debt 55,732 90,782        
Projected change in interest charges 600          
Cash and cash equivalent in foreign currency $ 20,600 6,100        
Projected change in gold price, per ounce | oz 100          
Projected change in revenue $ 15,400          
Projected change in operating cash flows $ 13,000          
Price per ounce of gold | oz 1,891          
Realized loss on non-hedge derivative contracts (Note 24) $ 794 (1,642) [2]        
(Gain)/loss on fair value of derivative financial instruments (794) 1,642        
Macquarie Credit Facility            
Disclosure of financial liabilities [line items]            
Cash available after repayment of convertible debt 25,000          
Undrawn borrowing facilities 10,000          
Long-term debt 54,547 42,386        
Debt       $ 50,000    
Notional amount 60,000     $ 70,000 $ 60,000  
Non-hedge derivative contracts            
Disclosure of financial liabilities [line items]            
Realized loss on non-hedge derivative contracts (Note 24) (2,476) 0        
(Gain)/loss on fair value of derivative financial instruments $ 2,171 $ 211        
LIBOR | Macquarie Credit Facility            
Disclosure of financial liabilities [line items]            
Borrowings, adjustment to interest rate basis 4.50%          
[1] Please refer to Note 28 for information on revised prior period comparatives.
[2] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
FINANCIAL RISK MANAGEMENT - Schedule of Contractual Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
[1]
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities $ 41,297  
Debt 111,498  
Lease liabilities 1,481  
Interest on debt and lease liabilities 11,181  
Current income tax liabilities 12,774 $ 811
Purchase obligations 10,109  
Rehabilitation provisions 17,751  
Total 206,091  
Less than 1 Year     
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 41,297  
Debt 51,498  
Lease liabilities 297  
Interest on debt and lease liabilities 6,517  
Current income tax liabilities 12,774  
Purchase obligations 10,109  
Rehabilitation provisions 2,024  
Total 124,516  
1 to 3 years     
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Debt 60,000  
Lease liabilities 606  
Interest on debt and lease liabilities 4,636  
Current income tax liabilities 0  
Purchase obligations 0  
Rehabilitation provisions 10,136  
Total 75,378  
4 to 5 years      
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Debt 0  
Lease liabilities 578  
Interest on debt and lease liabilities 28  
Current income tax liabilities 0  
Purchase obligations 0  
Rehabilitation provisions 4,778  
Total 5,384  
More than 5 Years     
Disclosure of financial liabilities [line items]    
Accounts payable and accrued liabilities 0  
Debt 0  
Lease liabilities 0  
Interest on debt and lease liabilities 0  
Current income tax liabilities 0  
Purchase obligations 0  
Rehabilitation provisions 813  
Total $ 813  
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of cash flows [abstract]    
Debt repayments of interest $ 7.1 $ 7.1
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION - Changes in Working Capital (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of cash flows [abstract]    
Increase in prepaids and other $ (4,069) $ (1,230)
Increase in inventories (899) (2,261)
Increase in accounts receivable and other receivables (319) (2,108)
Decrease in other liability 0 (6,410)
Increase in accounts payable and accrued liabilities 1,578 9,069
Changes in working capital and taxes paid (3,709) (2,940)
Income tax liabilities paid (25,759) (5,469)
Total changes in working capital and taxes paid $ (29,468) $ (8,409) [1]
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION - Reconciliation of Other Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of cash flows [abstract]    
Variable consideration adjustment (Note 18) $ 6,437 $ 3,073
Interest on financing component of deferred revenue (Note 10) 3,026 4,288
Accretion of 7% Convertible Debentures discount (Note 10) 2,733 2,390
Amortization of financing fees (Note 10) 1,020 642
Inventory write-off 176 0
Accretion of rehabilitation provisions (Note 10) 155 191
Interest on lease obligations 98 22
Loss/(gain) on disposal of assets 40 (13)
Loss on fair value of marketable securities 14 9
PRSU settlement, net of tax 0 (349)
Accretion of long-term receivables discount (Note 10) (220) 0
Gain on modification of Macquarie credit facility (Note 19) (2,973) 0
Other non-cash items $ 10,506 $ 10,253 [1]
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
SUPPLEMENTAL CASH FLOW INFORMATION - Reconciliation by Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]        
Beginning of period     $ 106,769 $ 100,706
Proceeds from debt agreements       60,000
Capitalized loan fees     (886) (2,614)
Principal payments on debt facilities     (10,000) (55,784) [1]
Payments of lease liabilities     (1,694) (1,416) [1]
Additions to lease liabilities     (599) 2,116
Accretion of debt     2,831 3,786
Proceeds from debt modification     10,000  
Gain on modification of credit facility     (2,973)  
Amortization of deferred financing fees     1,020 642
Foreign exchange loss     132  
Derecognized on sale of Prestea (Note 5)     (15)  
End of period     105,763 106,769
Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     (20) (25)
Lease liabilities        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     2,381 1,683
Proceeds from debt agreements       0
Capitalized loan fees     0 0
Principal payments on debt facilities     0  
Payments of lease liabilities     (1,694) (1,416)
Additions to lease liabilities     (599) 2,116
Accretion of debt     98 23
Proceeds from debt modification     0  
Gain on modification of credit facility     0  
Amortization of deferred financing fees     0  
Foreign exchange loss     132  
Derecognized on sale of Prestea (Note 5)     (15)  
End of period     1,481 2,381
Lease liabilities | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     (20) (25)
Ecobank Loan III        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     0 19,935
Proceeds from debt agreements       0
Capitalized loan fees     0 0
Principal payments on debt facilities     0 (20,277)
Payments of lease liabilities     0 0
Additions to lease liabilities     0 0
Accretion of debt     0 342
Proceeds from debt modification     0  
Gain on modification of credit facility     0  
Amortization of deferred financing fees     0  
Foreign exchange loss     0  
Derecognized on sale of Prestea (Note 5)     0  
End of period     0 0
Ecobank Loan III | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     0 0
Ecobank Loan IV        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     0 17,700
Proceeds from debt agreements       0
Capitalized loan fees     0 0
Principal payments on debt facilities     0 (18,000)
Payments of lease liabilities     0 0
Additions to lease liabilities     0 0
Accretion of debt     0 300
Proceeds from debt modification     0  
Gain on modification of credit facility     0  
Amortization of deferred financing fees     0  
Foreign exchange loss     0  
Derecognized on sale of Prestea (Note 5)     0  
End of period     0 0
Ecobank Loan IV | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     0 0
Vendor agreement        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     0 16,776
Proceeds from debt agreements       0
Capitalized loan fees     0 0
Principal payments on debt facilities     0 (17,507)
Payments of lease liabilities     0 0
Additions to lease liabilities     0 0
Accretion of debt     0 731
Proceeds from debt modification     0  
Gain on modification of credit facility     0  
Amortization of deferred financing fees     0  
Foreign exchange loss     0  
Derecognized on sale of Prestea (Note 5)     0  
End of period     0 0
Vendor agreement | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     0 0
7% Convertible Debentures        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     47,002 44,612
Proceeds from debt agreements       0
Capitalized loan fees     0 0
Principal payments on debt facilities     0 0
Payments of lease liabilities     0 0
Additions to lease liabilities     0 0
Accretion of debt     2,733 2,390
Proceeds from debt modification     0  
Gain on modification of credit facility     0  
Amortization of deferred financing fees     0  
Foreign exchange loss     0  
Derecognized on sale of Prestea (Note 5)     0  
End of period     49,735 47,002
7% Convertible Debentures | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     0 0
Macquarie Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Beginning of period     57,386 0
Proceeds from debt agreements       60,000
Capitalized loan fees     (886) (2,614)
Principal payments on debt facilities $ (5,000) $ (5,000) (10,000) 0
Payments of lease liabilities     0 0
Additions to lease liabilities     0 0
Accretion of debt     0 0
Proceeds from debt modification     10,000  
Gain on modification of credit facility     (2,973)  
Amortization of deferred financing fees     1,020  
Foreign exchange loss     0  
Derecognized on sale of Prestea (Note 5)     0  
End of period     54,547 57,386
Macquarie Credit Facility | Discontinued operations        
Disclosure of detailed information about borrowings [line items]        
Payments of lease liabilities     $ 0 $ 0
[1] The cash flows of Prestea operation for the period to the date of sale, as well as the restated comparative period, have been presented as discontinued operations. Refer to Note 5.
v3.21.1
COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
[1]
Disclosure of subsidiaries [line items]    
Capital commitments $ 300  
Operating commitments 9,800  
Amount of demand notice for customs related findings 2,300  
RESTRICTED CASH 2,131 $ 2,082
Wassa    
Disclosure of subsidiaries [line items]    
Assets to which significant restrictions apply $ 13,700  
Mineral revenue, royalties 5.00%  
[1] Please refer to Note 28 for information on revised prior period comparatives.
v3.21.1
PRIOR YEAR COMPARATIVES (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Revision of Prior Period, Reclassification, Adjustment | Prepaid expenses  
Disclosure of reclassifications or changes in presentation [line items]  
Amount of reclassifications or changes in presentation $ 1.5
v3.21.1
Label Element Value
Accounts Payable And Accrued Liabilities [Member] | Revision of Prior Period, Reclassification, Adjustment [Member]  
Amount of reclassifications or changes in presentation ifrs-full_AmountOfReclassificationsOrChangesInPresentation $ 2,500,000
Income Tax [Member] | Revision of Prior Period, Reclassification, Adjustment [Member]  
Amount of reclassifications or changes in presentation ifrs-full_AmountOfReclassificationsOrChangesInPresentation 800,000
Derivatives [member] | Revision of Prior Period, Reclassification, Adjustment [Member]  
Amount of reclassifications or changes in presentation ifrs-full_AmountOfReclassificationsOrChangesInPresentation $ 200,000