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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, 2017 | Dec. 31, 2016
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Share-based compensation | $ 6,095 | $ 10,290
Cost of inventory |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 190 | 97
Cash-settled | 1,639 | 2,109
General and administrative expense |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 1,988 | 1,999
Cash-settled | 2,237 | 5,948
Exploration, evaluation and reclamation expenses |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Equity-settled | 41 | 37
Cash-settled | $ 0 | $ 100

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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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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