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FINANCIAL RISK MANAGEMENT - Disclosure of exposure to commodity price risk (Parentheticals) (Details) lb in Millions | 12 Months Ended
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Dec. 31, 2020 lb | Dec. 31, 2019 lb
Disclosure Of Commodity Price Risk For Financial Instruments [Line Items] |  |
Assumed percentage of copper price increases or decrease | 10.00% |
Copper in concentrate exposed to price movements | 20 | 22
USD [Member] |  |
Disclosure Of Commodity Price Risk For Financial Instruments [Line Items] |  |
US dollar increase in commodity price per lb of copper | 0.37 | 0.28
Closing exchange rate | 1.27 | 1.30

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Commodity exposed to price movements. + References No definition available. + Details
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- Definition Disclosure of commodity price risk for financial instruments. + References No definition available. + Details
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- Definition US dollar increase in commodity price per lb of copper. + References No definition available. + Details
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- Details
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