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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details) | 3 Months Ended
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Dec. 31, 2023 $ / ounce $ / lb USD ($) | Dec. 31, 2022 $ / ounce $ / lb USD ($)
Copper | Short-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / lb | 3.75 | 3.50
Copper | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / lb | 3.50 | 3.25
Gold | Short-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / ounce | 1,900 | 1,700
Gold | Long-term [Member] |  |
Disclosure of impairment assumptions |  |
Estimated mineral price for measurement of fair value less costs of disposal | $ / ounce | 1,600 | 1,550
Gold | Minimum |  |
Disclosure of impairment assumptions |  |
WACC | 5.00% | 4.00%
Gold | Maximum |  |
Disclosure of impairment assumptions |  |
WACC | 9.00% | 13.00%
Gold | Average |  |
Disclosure of impairment assumptions |  |
WACC | 6.00% | 6.00%
value per ounce of gold | $ | 40 | 0
NAV multiple | 1.2 | 1.2
LOM year | 23 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 2023-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_f_iii&doctype=Standard -URIDate 2023-03-23 + Details
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