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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details) | 3 Months Ended
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Dec. 31, 2022 $ / lb $ / ounce | Dec. 31, 2021 $ / ounce $ / lb
Copper | Short-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / lb | 3.50 | 4.00
Copper | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / lb | 3.25 | 3.00
Copper | Average |  |
Disclosure of impairment assumptions |  |
WACC |  | 12.00%
Gold | Short-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / ounce | 1,700 | 1,700
Gold | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / ounce | 1,550 | 1,500
Gold | Minimum |  |
Disclosure of impairment assumptions |  |
WACC | 4.00% | 3.00%
Gold | Maximum |  |
Disclosure of impairment assumptions |  |
WACC | 13.00% | 8.00%
Gold | Average |  |
Disclosure of impairment assumptions |  |
WACC | 6.00% | 4.00%
NAV multiple | 1.2 | 1.2
LOM year | 20 years | 19 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 2022-03-24 -Paragraph 130 -Subparagraph f -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2022-en-r&anchor=para_130_f_iii&doctype=Standard -URIDate 2022-03-24 + Details
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