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Fair value of financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of fair value measurement of assets [abstract] |
Disclosure of significant observable inputs used in fair value measurement of equity [Table Text Block] |
|  |  |  |  |  |  |  |  | December 31, 2019 |
|  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  |  | $ |  |  | $ |  |  | $ |  |  | $ |
Recurring measurements |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss(i) |  |  |  |  |  |  |  |  |  |
Warrants on equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
| Precious metals |  | - |  |  | - |  |  | 1,067 |  |  | 1,067 |
| Other minerals |  | - |  |  | - |  |  | 633 |  |  | 633 |
Financial assets at fair value through other |  |  |  |  |  |  |  |  |  |  |  |
| comprehensive income (loss)(i) |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
| Precious metals |  | 48,295 |  |  | - |  |  | - |  |  | 48,295 |
| Other minerals |  | 9,114 |  |  | - |  |  | - |  |  | 9,114 |
|  |  | 57,409 |  |  | - |  |  | 1,700 |  |  | 59,109 |
|  |  |  |  |  |  |  |  | December 31, 2018 |
|  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  |  | $ |  |  | $ |  |  | $ |  |  | $ |
Recurring measurements |  |  |  |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss(i) |  |  |  |  |  |  |  |  |  |
Warrants on equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
| Precious metals |  | - |  |  | - |  |  | 3,322 |  |  | 3,322 |
| Other minerals |  | - |  |  | - |  |  | 26 |  |  | 26 |
Financial assets at fair value through other |  |  |  |  |  |  |  |  |  |  |  |
| comprehensive income (loss)(i) |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Private mining exploration and development companies - precious metals |  | - |  |  | - |  |  | 56,252 |  |  | 56,252 |
| Publicly traded mining exploration and development companies |  |  |  |  |  |  |  |  |  |  |  |
| Precious metals |  | 35,544 |  |  | - |  |  | - |  |  | 35,544 |
| Other minerals |  | 12,259 |  |  | - |  |  | - |  |  | 12,259 |
|  |  | 47,803 |  |  | - |  |  | 59,600 |  |  | 107,403 |
(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 investments [Table Text Block] |
|  |  | 2019 |  |  | 2018 |
|  |  | $ |  |  | $ |
Balance - January 1 |  | 59,600 |  |  | 8,092 |
| Acquisitions |  | 2,885 |  |  | 3,093 |
| Deemed acquisition (Note 13) |  | - |  |  | 46,625 |
| Disposal (Note 21) |  | (58,641 | ) |  | - |
| Warrants exercised |  | (1,055 | ) |  | - |
| Change in fair value - warrants exercised(i) |  | (250 | ) |  | - |
| Change in fair value - warrants expired(i) |  | (165 | ) |  | (1,180 | )
| Change in fair value - investments held at the end of the period(i) |  | (674 | ) |  | 2,970 |
Balance - December 31 |  | 1,700 |  |  | 59,600 |
(i) Recognized in the consolidated statements of loss under other losses, net for the warrants and in the consolidated statements of other comprehensive loss under changes in fair value of financial assets at fair value through comprehensive income (loss) for the investments in common shares in private companies.
Disclosure of detailed information about fair value of long-term debt [Table Text Block] |
|  | December 31, 2019 |
|  | Fair value |  |  | Carrying amount |
|  | $ |  |  | $ |
Long-term debt - Level 1 |  | 303,240 |  |  | 280,807 |
Long-term debt - Level 2 |  | 68,585 |  |  | 68,235 |
Balance - December 31 |  | 371,825 |  |  | 349,042 |

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- Definition The disclosure of significant inputs for which market data are not available and that are developed using the best information available about the assumptions that market participants would use when measuring the fair value of the entity's own equity instruments. [Refer: Entity's own equity instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_d&doctype=Standard -URIDate 2018-03-16 + Details
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