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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Share-based compensation | $ 15,851 | $ 14,424
Production costs |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 449 | 250
Cash-settled | 1,715 | 1,201
Share-based compensation expense |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 6,903 | 3,715
Cash-settled | 1,597 | 9,099
Exploration, evaluation and reclamation expense |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 43 | 40
Cash-settled | 126 | 119
Transaction and integration expense |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 1,099 | 0
Cash-settled | $ 3,919 | $ 0

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- Definition The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_51_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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