Reporting entity (Narrative) (Details) - Copper Mountain Mine (BC) Ltd. [Member]	1 Months Ended
Jan. 31, 2024	Jun. 20, 2023
Disclosure of detailed information about business combination [line items]
Proportion of voting rights held in subsidiary	75.00%	75.00%
Copper Mountain Mining Corporation [Member]
Disclosure of detailed information about business combination [line items]
Proportion of voting rights held in subsidiary		75.00%
Mitsubishi Materials Corporation [Member]
Disclosure of detailed information about business combination [line items]
Proportion of voting rights held by non-controlling interests		25.00%

The proportion of the voting rights in a subsidiary held by the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 19B
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_ProportionOfVotingPowerHeldInSubsidiary
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration