IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details)	3 Months Ended
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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Life of mine used in current measurement of fair value less costs of disposal

+ References

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- Definition

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

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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

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- Definition

The discount rate used in the current measurement of fair value less costs of disposal.

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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

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