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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax [Absract] |
Schedule of Deferred tax assets and liabilities |
|  | Recognized in earnings |  |  | As at December 31
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ | 74,039 |  | $ | 119,132 |  | $ | 319,185 |  | $ | 245,206
Provision for reclamation |  | 2,325 |  |  | (36,622) |  |  | 193,514 |  |  | 191,189
Inventories |  | (2,163) |  |  | 1,137 |  |  | - |  |  | 2,163
Foreign exploration and development |  | (14) |  |  | (14) |  |  | 5,267 |  |  | 5,281
Income tax losses (gains) |  | (108,839) |  |  | 39,289 |  |  | 390,341 |  |  | 499,180
Defined benefit plan actuarial losses |  | - |  |  | - |  |  | 7,947 |  |  | 5,646
Long-term investments and other |  | (17,377) |  |  | 24,169 |  |  | 40,423 |  |  | 57,347
Deferred tax assets |  | (52,029) |  |  | 147,091 |  |  | 956,677 |  |  | 1,006,012
Liabilities |  |  |  |  |  |  |  |  |  |  |
Inventories |  | 301 |  |  | - |  |  | 301 |  |  | -
Deferred tax liabilities |  | 301 |  |  | - |  |  | 301 |  |  | -
Net deferred tax asset (liability | $ | (52,330) |  | $ | 147,091 |  | $ | 956,376 |  | $ | 1,006,012
Deferred tax allocated as |  |  |  |  |  |  |  | 2019 |  |  | 2018
Deferred tax assets |  |  |  |  |  |  | $ | 956,376 |  | $ | 1,006,012
Deferred tax liabilities |  |  |  |  |  |  |  | - |  |  | -
Net deferred tax asset |  |  |  |  |  |  | $ | 956,376 |  | $ | 1,006,012
|  | 2019 |  |  | 2018
Deferred tax asset at beginning of year | $ | 1,006,012 |  | $ | 848,704
Recovery (expense) for the year in net earnings |  | (52,330) |  |  | 147,091
Recovery (expense) for the year in other comprehensive income |  | 2,754 |  |  | (851)
Change to equity accounting - JV Inkai |  | - |  |  | 10,849
Effect of movements in exchange rates |  | (60) |  |  | 219
End of year | $ | 956,376 |  | $ | 1,006,012
|  | 2019 |  |  | 2018
Income tax losses | $ | 280,330 |  | $ | 270,154
Property, plant and equipment |  | 2,321 |  |  | 2,344
Provision for reclamation |  | 75,082 |  |  | 88,036
Long-term investments and other |  | 70,380 |  |  | 72,500
Total | $ | 428,113 |  | $ | 433,034
Schedule of Tax rate reconciliation |
|  |  |  | 2019 |  |  | 2018
Earnings before income taxes and non-controlling interest | $ | 135,018 |  | $ | 39,929
Combined federal and provincial tax rate |  | 26.9% |  |  | 26.9%
Computed income tax expense |  | 36,320 |  |  | 10,741
Increase (decrease) in taxes resulting from: |  |  |  |  |
| Difference between Canadian rates and rates |  |  |  |  |
|  | applicable to subsidiaries in other countries |  | 5,558 |  |  | (78,138)
| Change in unrecognized deferred tax assets |  | 19,646 |  |  | 18,027
| Share-based compensation plans |  | 1,146 |  |  | 1,292
| Change in tax provision related to transfer pricing |  | - |  |  | (61,000)
| Non-deductible (non-taxable) capital amounts |  | - |  |  | (13,249)
| Income in equity-accounted investee |  | (12,074) |  |  | -
| Change in uncertain tax positions |  | 2,572 |  |  | (3,517)
| Other permanent differences |  | 7,909 |  |  | (462)
Income tax expense (recovery) | $ | 61,077 |  | $ | (126,306)
Schedule of Earnings and income taxes by jurisdiction |
|  |  | 2019 |  |  | 2018
Earnings (loss) before income taxes |  |  |  |  |
| Canada | $ | 229,429 |  | $ | (257,291)
| Foreign |  | (94,411) |  |  | 297,220
|  | $ | 135,018 |  | $ | 39,929
Current income taxes |  |  |  |  |
| Canada | $ | 7,969 |  | $ | 5,913
| Foreign |  | 778 |  |  | 14,872
|  | $ | 8,747 |  | $ | 20,785
Deferred income taxes (recovery) |  |  |  |  |
| Canada | $ | 60,010 |  | $ | (149,284)
| Foreign |  | (7,680) |  |  | 2,193
|  | $ | 52,330 |  | $ | (147,091)
Income tax expense (recovery) | $ | 61,077 |  | $ | (126,306)
Schedule of Income tax losses |
Date of expiry |  | Canada |  | US |  | Other |  | Total
2026 | $ | - | $ | - | $ | 80,000 | $ | 80,000
2030 |  | 47 |  | - |  | - |  | 47
2031 |  | - |  | 20,859 |  | - |  | 20,859
2032 |  | 272 |  | 22,464 |  | - |  | 22,736
2033 |  | 173,691 |  | 38,296 |  | - |  | 211,987
2034 |  | 322,359 |  | 21,125 |  | - |  | 343,484
2035 |  | 372,558 |  | 14,699 |  | - |  | 387,257
2036 |  | 209,265 |  | 44,674 |  | - |  | 253,939
2037 |  | 143 |  | 33,462 |  | - |  | 33,605
2038 |  | 5,581 |  | 51,896 |  | - |  | 57,477
2039 |  | 6,524 |  | 40,559 |  | - |  | 47,083
No expiry |  | - |  | - |  | 1,051,195 |  | 1,051,195
| $ | 1,090,440 | $ | 288,034 | $ | 1,131,195 | $ | 2,509,669

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