IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details)	12 Months Ended
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

Estimated mineral price for measurement of fair value less costs of disposal

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- Definition

Life of mine used in current measurement of fair value less costs of disposal

+ References

No definition available.

+ Details

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- Definition

Net asset value multiple used in current measurement of fair value less costs of disposal

+ References

No definition available.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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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

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