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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | Fair Value |
Receivables from provisional concentrate sales |  | $ | — |  | $ | 16.4 |  | $ | — |  |  | $ | 16.4 |
Equity investments |  |  | 141.7 |  |  | — |  |  | 3.9 |  |  |  | 145.6 |
Warrants |  |  | — |  |  | 3.0 |  |  | — |  |  |  | 3.0 |
|  | $ | 141.7 |  | $ | 19.4 |  | $ | 3.9 |  |  | $ | 165.0 |
|  | Quoted Prices in |  | Significant Other |  | Significant |  |  |  |
|  | Active Markets for |  | Observable |  | Unobservable |  |  |  |
|  | Identical Assets |  | Inputs |  | Inputs |  |  | Aggregate |
As at December 31, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | Fair Value |
Receivables from provisional concentrate sales |  | $ | — |  | $ | 8.5 |  | $ | — |  |  | $ | 8.5 |
Equity investments |  |  | 132.8 |  |  | — |  |  | 3.9 |  |  |  | 136.7 |
Warrants |  |  | — |  |  | 0.7 |  |  | — |  |  |  | 0.7 |
|  | $ | 132.8 |  | $ | 9.2 |  | $ | 3.9 |  |  | $ | 145.9 |
Non recurring Basis |
Fair value measurements |
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis |
|  | Quoted Prices in |  |  |  | Significant |  |  |  |
|  | Active Markets for |  | Significant Other |  | Unobservable |  |  |  |
|  | Identical Assets |  | Observable Inputs |  | Inputs |  |  | Aggregate |
As at December 31, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | Fair Value |
Royalty, stream and working interests |  | $ | — |  | $ | — |  | $ | 14.6 |  |  | $ | 14.6 |
|  | $ | — |  | $ | — |  | $ | 14.6 |  |  | $ | 14.6 |

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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 2019-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_10_e&doctype=Standard -URIDate 2019-03-27 + Details
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