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FINANCIAL RISK MANAGEMENT - Disclosure of fair value measurement of assets (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial assets at fair value through profit or loss, category [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative asset copper call options | $ 1,514 |
Derivative asset fuel call options | 278 |
Financial assets designated at fair value | 1,792 |
Financial assets at fair value through profit or loss, category [Member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative asset copper call options | 0 |
Derivative asset fuel call options | 0 |
Financial assets designated at fair value | 0 |
Financial assets at fair value through profit or loss, category [Member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative asset copper call options | 1,514 |
Derivative asset fuel call options | 278 |
Financial assets designated at fair value | 1,792 |
Financial assets at fair value through profit or loss, category [Member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative asset copper call options | 0 |
Derivative asset fuel call options | 0 |
Financial assets designated at fair value | 0 |
Financial assets at fair value through other comprehensive income, category [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Marketable securities | 1,791 | $ 730
Investment in subscription receipts | 1,200 | 2,400
Reclamation deposits | 2,825 | 3,083
Financial assets designated at fair value | 5,816 | 6,213
Financial assets at fair value through other comprehensive income, category [Member] | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Marketable securities | 1,791 | 730
Investment in subscription receipts | 0 | 0
Reclamation deposits | 2,825 | 3,083
Financial assets designated at fair value | 4,616 | 3,813
Financial assets at fair value through other comprehensive income, category [Member] | Level 2 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Marketable securities | 0 | 0
Investment in subscription receipts | 0 | 0
Reclamation deposits | 0 | 0
Financial assets designated at fair value | 0 | 0
Financial assets at fair value through other comprehensive income, category [Member] | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Marketable securities | 0 | 0
Investment in subscription receipts | 1,200 | 2,400
Reclamation deposits | 0 | 0
Financial assets designated at fair value | $ 1,200 | $ 2,400

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Represents the value of derivative asset copper call options. + References No definition available. + Details
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