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Fair value of financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of fair value measurement of assets [abstract] |
Disclosure of significant observable inputs used in fair value measurement [Table Text Block] |
|  |  |  |  |  |  |  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Recurring measurements |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss(i) |  |  |  |  |  |  |  |  |  |  |  |
Warrants on equity securities and convertible debentures and notes |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
Precious metals |  | - |  |  | - |  |  | 24,327 |  |  | 24,327 |
Other minerals |  | 13,048 |  |  | - |  |  | 10,607 |  |  | 23,655 |
Financial assets at fair value through other comprehensive (loss) income(i) |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
Precious metals |  | 46,668 |  |  | - |  |  | - |  |  | 46,668 |
Other minerals |  | 47,563 |  |  | - |  |  | - |  |  | 47,563 |
|  | 107,279 |  |  | - |  |  | 34,934 |  |  | 142,213 |
|  |  |  |  |  |  |  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Recurring measurements |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss(i) |  |  |  |  |  |  |  |  |  |  |  |
Warrants on equity securities and convertible debentures and notes |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
Precious metals |  | - |  |  | - |  |  | 23,904 |  |  | 23,904 |
Other minerals |  | - |  |  | - |  |  | 1,159 |  |  | 1,159 |
Financial assets at fair value through other comprehensive (loss) income (i) |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
Precious metals |  | 95,796 |  |  | - |  |  | - |  |  | 95,796 |
Other minerals |  | 19,794 |  |  | - |  |  | - |  |  | 19,794 |
|  | 115,590 |  |  | - |  |  | 25,063 |  |  | 140,653 |
(i) On the basis of its analysis of the nature, characteristics and risks of equity securities, the Company has determined that presenting them by industry and type of investment is appropriate.
Disclosure of detailed information about changes in fair value of level 3 investments [Table Text Block] |
|  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |
Balance - January 1 |  | 25,063 |  |  | 1,700 |
Acquisitions |  | 12,754 |  |  | 4,782 |
Amendment of a note receivable (Note 13) |  | - |  |  | 16,541 |
Warrants exercised |  | (1,122 | ) |  | (347 | )
Change in fair value - warrants exercised(i) |  | 300 |  |  | 102 |
Change in fair value - warrants expired(i) |  | (15 | ) |  | (48 | )
Change in fair value - investments held at the end of the period(i) |  | (2,046 | ) |  | 2,333 |
Balance - December 31 |  | 34,934 |  |  | 25,063 |
(i) Recognized in the consolidated statements of income (loss) under other gains (losses), net.
Disclosure of detailed information about fair value of long-term debt [Table Text Block] |
|  |  |  |  | December 31, 2021 |  |  |  |  |  | December 31, 2020 |
|  | Fair |  |  | Carrying |  |  | Fair |  |  | Carrying |
|  | value |  |  | amount |  |  | value |  |  | amount |
|  | $ |  |  | $ |  |  |  |  |  |  |
Long-term debt - Level 1 |  | 303,000 |  |  | 293,281 |  |  | 318,000 |  |  | 286,903 |
Long-term debt - Level 2 |  | - |  |  | - |  |  | 49,928 |  |  | 49,866 |
Balance |  | 303,000 |  |  | 293,281 |  |  | 367,928 |  |  | 336,769 |

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