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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
Recurring Basis |
Fair value measurements |
Schedule of Assets and Liabilities Measured at Fair Value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Quoted prices in |  | Significant other |  | Significant |  |  | ​ |
​ | ​ | active markets for | ​ | observable | ​ | unobservable | ​ | ​ | ​ |
​ | ​ | identical assets | ​ | inputs | ​ | inputs | ​ | ​ | Aggregate |
As at December 31, 2024 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | ​ | fair value |
Equity investments | ​ | $ | 316.8 | ​ | $ | — | ​ | $ | 8.0 | ​ | ​ | $ | 324.8 | ​
Warrants | ​ |  | — | ​ |  | 0.7 | ​ |  | — | ​ | ​ |  | 0.7 | ​
Receivables from provisional concentrate sales | ​ | ​ | — | ​ | ​ | 2.6 | ​ | ​ | — | ​ | ​ | ​ | 2.6 | ​
​ | ​ | $ | 316.8 | ​ | $ | 3.3 | ​ | $ | 8.0 | ​ | ​ | $ | 328.1 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Quoted prices in |  | Significant other |  | Significant |  |  | ​ |
​ | ​ | active markets for | ​ | observable | ​ | unobservable | ​ | ​ | ​ |
​ | ​ | identical assets | ​ | inputs | ​ | inputs | ​ | ​ | Aggregate |
As at December 31, 2023 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | ​ | fair value |
Equity investments | ​ | $ | 241.8 | ​ | $ | — | ​ | $ | 4.6 | ​ | ​ | $ | 246.4 | ​
Skeena Convertible Debenture | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 24.8 | ​ | ​ | ​ | 24.8 | ​
Warrants | ​ |  | — | ​ |  | 8.1 | ​ |  | — | ​ | ​ |  | 8.1 | ​
Receivables from provisional concentrate sales | ​ | ​ | — | ​ | ​ | 5.7 | ​ | ​ | — | ​ | ​ | ​ | 5.7 | ​
​ | ​ | $ | 241.8 | ​ | $ | 13.8 | ​ | $ | 29.4 | ​ | ​ | $ | 285.0 | ​

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- Definition The disclosure of the fair value of financial instruments. [Refer: Classes of financial instruments [domain]; At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_10_e&doctype=Standard -URIDate 2024-03-27 + Details
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