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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
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 June 30, 2022 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | ​ | fair value |
Receivables from provisional concentrate sales | ​ | $ | — | ​ | $ | 7.4 | ​ | $ | — | ​ | ​ | $ | 7.4 | ​
Equity investments | ​ |  | 169.2 | ​ |  | — | ​ |  | 41.4 | ​ | ​ |  | 210.6 | ​
Warrants | ​ |  | — | ​ |  | 2.6 | ​ |  | — | ​ | ​ |  | 2.6 | ​
​ | ​ | $ | 169.2 | ​ | $ | 10.0 | ​ | $ | 41.4 | ​ | ​ | $ | 220.6 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Quoted prices in |  | Significant other |  | Significant |  |  | ​ |
​ | ​ | active markets for | ​ | observable | ​ | unobservable | ​ | ​ | ​ |
​ | ​ | identical assets | ​ | inputs | ​ | inputs | ​ | ​ | Aggregate |
As at December 31, 2021 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | ​ | fair value |
Receivables from provisional concentrate sales | ​ | $ | — | ​ | $ | 4.8 | ​ | $ | — | ​ | ​ | $ | 4.8 | ​
Equity investments | ​ |  | 231.0 | ​ |  | — | ​ |  | 4.1 | ​ | ​ |  | 235.1 | ​
Warrants | ​ |  | — | ​ |  | 0.8 | ​ |  | — | ​ | ​ |  | 0.8 | ​
​ | ​ | $ | 231.0 | ​ | $ | 5.6 | ​ | $ | 4.1 | ​ | ​ | $ | 240.7 | ​

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- Definition The disclosure of the fair value of financial instruments. [Refer: Financial instruments, class [member]; At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_10_e&doctype=Standard -URIDate 2021-03-24 + Details
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