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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax [Absract] |
Schedule of Deferred tax assets and liabilities |
|  | Recognized in earnings |  |  | As at December 31
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017
Assets |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ | 119,132 |  | $ | (4,325) |  | $ | 245,206 |  | $ | 115,193
Provision for reclamation |  | (36,622) |  |  | (16,760) |  |  | 191,189 |  |  | 227,785
Inventories |  | 1,137 |  |  | 1,027 |  |  | 2,163 |  |  | 1,027
Foreign exploration and development |  | (14) |  |  | 16 |  |  | 5,281 |  |  | 5,295
Income tax losses |  | 39,289 |  |  | 57,203 |  |  | 499,180 |  |  | 459,885
Defined benefit plan actuarial losses |  | - |  |  | - |  |  | 5,646 |  |  | 7,845
Long-term investments and other |  | 24,169 |  |  | (27,166) |  |  | 57,347 |  |  | 31,674
Deferred tax assets |  | 147,091 |  |  | 9,995 |  |  | 1,006,012 |  |  | 848,704
Liabilities |  |  |  |  |  |  |  |  |  |  |
Inventories |  | - |  |  | (12,430) |  |  | - |  |  | -
Deferred tax liabilities |  | - |  |  | (12,430) |  |  | - |  |  | -
Net deferred tax asset | $ | 147,091 |  | $ | 22,425 |  | $ | 1,006,012 |  | $ | 848,704
Deferred tax allocated as |  |  |  |  |  |  |  | 2018 |  |  | 2017
Deferred tax assets |  |  |  |  |  |  | $ | 1,006,012 |  | $ | 861,171
Deferred tax liabilities |  |  |  |  |  |  |  | - |  |  | (12,467)
Net deferred tax asset |  |  |  |  |  |  | $ | 1,006,012 |  | $ | 848,704
|  | 2018 |  |  | 2017
Net deferred tax asset at beginning of year | $ | 848,704 |  | $ | 820,048
Recovery for the year in net earnings |  | 147,091 |  |  | 22,425
Recovery (expense) for the year in other comprehensive income |  | (851) |  |  | 1,490
Change to equity accounting - JV Inkai |  | 10,849 |  |  | -
Effect of movements in exchange rates |  | 219 |  |  | 4,741
End of year | $ | 1,006,012 |  | $ | 848,704
|  | 2018 |  |  | 2017
Income tax losses | $ | 270,154 |  | $ | 259,770
Property, plant and equipment |  | 2,344 |  |  | 2,076
Provision for reclamation |  | 88,036 |  |  | 71,463
Long-term investments and other |  | 72,500 |  |  | 68,544
Total | $ | 433,034 |  | $ | 401,853
Schedule of Tax rate reconciliation |
|  |  |  | 2018 |  |  | 2017
Earnings (loss) before income taxes and non-controlling interest | $ | 39,929 |  | $ | (207,237)
Combined federal and provincial tax rate |  | 26.9% |  |  | 26.7%
Computed income tax expense (recovery) |  | 10,741 |  |  | (55,332)
Increase (decrease) in taxes resulting from: |  |  |  |  |
| Difference between Canadian rates and rates |  |  |  |  |
|  | applicable to subsidiaries in other countries |  | (78,138) |  |  | (51,526)
| Change in unrecognized deferred tax assets |  | 18,027 |  |  | 70,353
| Share-based compensation plans |  | 1,292 |  |  | 1,349
| Change in tax provision related to transfer pricing |  | (61,000) |  |  | 3,000
| Non-deductible (non-taxable) capital amounts |  | (13,249) |  |  | 3,034
| Change in legislation |  | - |  |  | (12,199)
| Non-deductible goodwill impairment |  | - |  |  | 35,520
| Change in uncertain tax positions |  | (3,517) |  |  | -
| Other permanent differences |  | (462) |  |  | 3,282
Income tax recovery | $ | (126,306) |  | $ | (2,519)
Schedule of Earnings and income taxes by jurisdiction |
|  |  | 2018 |  |  | 2017
Earnings (loss) before income taxes |  |  |  |  |
| Canada | $ | (257,291) |  | $ | (53,521)
| Foreign |  | 297,220 |  |  | (153,716)
|  | $ | 39,929 |  | $ | (207,237)
Current income taxes |  |  |  |  |
| Canada | $ | 5,913 |  | $ | 5,221
| Foreign |  | 14,872 |  |  | 14,685
|  | $ | 20,785 |  | $ | 19,906
Deferred income taxes (recovery) |  |  |  |  |
| Canada | $ | (149,284) |  | $ | (18,272)
| Foreign |  | 2,193 |  |  | (4,153)
|  | $ | (147,091) |  | $ | (22,425)
Income tax recovery | $ | (126,306) |  | $ | (2,519)
Schedule of Income tax losses |
Date of expiry |  | Canada |  | US |  | Other |  | Total
2030 | $ | 47 | $ | - | $ | - | $ | 47
2031 |  | - |  | 21,909 |  | - |  | 21,909
2032 |  | 236,484 |  | 23,596 |  | - |  | 260,080
2033 |  | 299,692 |  | 40,224 |  | - |  | 339,916
2034 |  | 322,021 |  | 22,189 |  | - |  | 344,210
2035 |  | 363,569 |  | 15,439 |  | - |  | 379,008
2036 |  | 209,178 |  | 46,923 |  | - |  | 256,101
2037 |  | 143 |  | 35,147 |  | - |  | 35,290
2038 |  | 5,731 |  | 66,115 |  | - |  | 71,846
2039 |  | - |  | - |  | - |  | -
2040 |  | - |  | - |  | - |  | -
No expiry |  | - |  | - |  | 1,101,519 |  | 1,101,519
| $ | 1,436,865 | $ | 271,542 | $ | 1,101,519 | $ | 2,809,926

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