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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax [Absract] |
Schedule of Deferred tax assets and liabilities |
|  | Recognized in earnings |  |  | As at December 31
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ | (38,389) |  | $ | 74,039 |  | $ | 280,798 |  | $ | 319,185
Provision for reclamation |  | 28,628 |  |  | 2,325 |  |  | 222,142 |  |  | 193,514
Inventories |  | 4,071 |  |  | (2,163) |  |  | 4,071 |  |  | -
Foreign exploration and development |  | 2 |  |  | (14) |  |  | 5,269 |  |  | 5,267
Income tax losses (gains) |  | (7,629) |  |  | (108,839) |  |  | 382,712 |  |  | 390,341
Defined benefit plan actuarial losses |  | - |  |  | - |  |  | 9,410 |  |  | 7,947
Long-term investments and other |  | (5,678) |  |  | (17,377) |  |  | 32,276 |  |  | 40,423
Deferred tax assets |  | (18,995) |  |  | (52,029) |  |  | 936,678 |  |  | 956,677
Liabilities |  |  |  |  |  |  |  |  |  |  |
Inventories |  | (301) |  |  | 301 |  |  | - |  |  | 301
Deferred tax liabilities |  | (301) |  |  | 301 |  |  | - |  |  | 301
Net deferred tax asset (liability) | $ | (18,694) |  | $ | (52,330) |  | $ | 936,678 |  | $ | 956,376
Deferred tax allocated as |  |  |  |  |  |  |  | 2020 |  |  | 2019
Deferred tax assets |  |  |  |  |  |  | $ | 936,678 |  | $ | 956,376
Deferred tax liabilities |  |  |  |  |  |  |  | - |  |  | -
Net deferred tax asset |  |  |  |  |  |  | $ | 936,678 |  | $ | 956,376
|  | 2020 |  |  | 2019
Deferred tax asset at beginning of year | $ | 956,376 |  | $ | 1,006,012
Expense for the year in net earnings |  | (18,694) |  |  | (52,330)
Recovery (expense) for the year in other comprehensive income |  | (1,006) |  |  | 2,754
Effect of movements in exchange rates |  | 2 |  |  | (60)
End of year | $ | 936,678 |  | $ | 956,376
|  | 2020 |  |  | 2019
Income tax losses | $ | 271,163 |  | $ | 280,330
Property, plant and equipment |  | 2,204 |  |  | 2,321
Provision for reclamation |  | 75,219 |  |  | 75,082
Long-term investments and other |  | 60,223 |  |  | 70,380
Total | $ | 408,809 |  | $ | 428,113
Schedule of Tax rate reconciliation |
|  |  |  | 2020 |  |  | 2019
Earnings (loss) before income taxes and non-controlling interest | $ | (39,531) |  | $ | 135,018
Combined federal and provincial tax rate |  | 26.9% |  |  | 26.9%
Computed income tax expense (recovery) |  | (10,634) |  |  | 36,320
Increase (decrease) in taxes resulting from: |  |  |  |  |
| Difference between Canadian rates and rates |  |  |  |  |
|  | applicable to subsidiaries in other countries |  | 42,028 |  |  | 5,558
| Change in unrecognized deferred tax assets |  | (7,766) |  |  | 19,646
| Share-based compensation plans |  | 398 |  |  | 1,146
| Change in legislation |  | (1,978) |  |  | -
| Income in equity-accounted investee |  | (12,155) |  |  | (12,074)
| Change in uncertain tax positions |  | 2,455 |  |  | 2,572
| Other permanent differences |  | 1,318 |  |  | 7,909
Income tax expense | $ | 13,666 |  | $ | 61,077
Schedule of Earnings and income taxes by jurisdiction |
|  |  | 2020 |  |  | 2019
Earnings (loss) before income taxes |  |  |  |  |
| Canada | $ | 72,809 |  | $ | 229,429
| Foreign |  | (112,340) |  |  | (94,411)
|  | $ | (39,531) |  | $ | 135,018
Current income taxes (recovery) |  |  |  |  |
| Canada | $ | (394) |  | $ | 7,969
| Foreign |  | (4,634) |  |  | 778
|  | $ | (5,028) |  | $ | 8,747
Deferred income taxes (recovery) |  |  |  |  |
| Canada | $ | 9,122 |  | $ | 60,010
| Foreign |  | 9,572 |  |  | (7,680)
|  | $ | 18,694 |  | $ | 52,330
Income tax expense | $ | 13,666 |  | $ | 61,077
Schedule of Income tax losses |
Date of expiry |  | Canada |  | US |  | Other |  | Total
2026 | $ | - | $ | - | $ | 13,819 | $ | 13,819
2027 |  | - |  | - |  | 2,841 |  | 2,841
2030 |  | 47 |  | - |  | - |  | 47
2031 |  | - |  | 20,436 |  | - |  | 20,436
2032 |  | 272 |  | 22,010 |  | - |  | 22,282
2033 |  | 7,037 |  | 37,520 |  | - |  | 44,557
2034 |  | 365,039 |  | 20,697 |  | 4,850 |  | 390,586
2035 |  | 372,376 |  | 14,401 |  | 7,752 |  | 394,529
2036 |  | 211,299 |  | 43,769 |  | 6,106 |  | 261,174
2037 |  | 143 |  | 32,785 |  | 298 |  | 33,226
2038 |  | 5,581 |  | 35,357 |  | - |  | 40,938
2039 |  | 6,424 |  | 27,348 |  | - |  | 33,772
2040 |  | 3,669 |  | 21,798 |  | - |  | 25,467
No expiry |  | - |  | - |  | 1,115,973 |  | 1,115,973
| $ | 971,887 | $ | 276,121 | $ | 1,151,639 | $ | 2,399,647

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