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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details) | 12 Months Ended
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Dec. 31, 2021 $ / ounce $ / pound | Dec. 31, 2020 $ / ounce $ / pound
Copper [Member] | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / pound | 3.00 | 3.00
Copper [Member] | Average |  |
Disclosure of impairment assumptions |  |
WACC | 12.00% |
Gold [Member] | Short-term [Member] |  |
Disclosure of impairment assumptions |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | 1,700 | 1,700
Gold [Member] | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | 1,500 | 1,400
Gold [Member] | Minimum |  |
Disclosure of impairment assumptions |  |
WACC | 3.00% | 3.00%
Gold [Member] | Maximum |  |
Disclosure of impairment assumptions |  |
WACC | 8.00% | 12.00%
Gold [Member] | Average |  |
Disclosure of impairment assumptions |  |
WACC | 4.00% | 5.00%
NAV multiple | 1.2 | 1.3
LOM year | 19 years | 20 years

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- Definition The discount rate used in the current measurement of fair value less costs of disposal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_f_iii&doctype=Standard -URIDate 2021-03-24 + Details
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