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Property, plant and equipment (Schedule of Property plant and equipment table) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | $ 3,576,599 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 4,156 | $ 6,270
Additions | 7,853 | 477
Disposals | (11) |
Depreciation charge | (2,117) | (1,870)
Transfers | (429) | (721)
Right-of-use assets - end of year | 9,452 | 4,156
Property, plant and equipment - End of year | 3,473,490 | 3,576,599
Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 9,209,575 | 9,267,622
Acquisitions | 97,930 |
Additions | 143,448 | 98,784
Transfers | 429 | 721
Change in reclamation provision | (93,451) | (62,427)
Disposals | (15,004) | (36,130)
Effect of movements in exchange rates | 73,424 | (58,995)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 9,416,351 | 9,209,575
Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (5,637,132) | (5,502,335)
Depreciation charge | 241,323 | 201,557
Change in reclamation provision | (22,944) | 8,407
Disposals | 13,701 | 26,967
Effect of movements in exchange rates | (64,615) | (31,386)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (5,952,313) | (5,637,132)
Land and buildgings [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 2,051,400 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 931 | 1,806
Additions | 5,917 | 0
Disposals | 0 |
Depreciation charge | (870) | (875)
Transfers | (19) | 0
Right-of-use assets - end of year | 5,959 | 931
Property, plant and equipment - End of year | 1,902,228 | 2,051,400
Land and buildgings [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 5,152,209 | 5,224,333
Acquisitions | 67,998 |
Additions | 4,385 | 1,520
Transfers | 25,023 | 17,145
Change in reclamation provision | (93,451) | (62,427)
Disposals | (4,885) | (23,075)
Effect of movements in exchange rates | 45,859 | (5,287)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 5,197,138 | 5,152,209
Land and buildgings [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (3,101,740) | (3,031,292)
Depreciation charge | 137,543 | 104,641
Change in reclamation provision | (22,944) | 8,407
Disposals | 4,851 | 20,999
Effect of movements in exchange rates | (43,493) | (4,787)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (3,300,869) | (3,101,740)
Plant and equipment [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 771,917 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 1,584 | 2,322
Additions | 1,330 | 477
Disposals | (11) |
Depreciation charge | (560) | (494)
Transfers | (778) | (721)
Right-of-use assets - end of year | 1,565 | 1,584
Property, plant and equipment - End of year | 745,875 | 771,917
Plant and equipment [member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 2,732,561 | 2,699,844
Acquisitions | 27,646 |
Additions | 8,927 | 8,807
Transfers | 39,091 | 31,243
Change in reclamation provision | 0 | 0
Disposals | (8,423) | (6,019)
Effect of movements in exchange rates | 12,507 | (1,314)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 2,812,309 | 2,732,561
Plant and equipment [member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (1,962,228) | (1,876,336)
Depreciation charge | 101,923 | 92,670
Change in reclamation provision | 0 | 0
Disposals | 8,201 | 5,623
Effect of movements in exchange rates | (12,049) | (1,155)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (2,067,999) | (1,962,228)
Furniture and fixtures [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 7,888 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 1,641 | 2,142
Additions | 606 | 0
Disposals | 0 |
Depreciation charge | (687) | (501)
Transfers | 368 | 0
Right-of-use assets - end of year | 1,928 | 1,641
Property, plant and equipment - End of year | 6,432 | 7,888
Furniture and fixtures [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 84,366 | 78,911
Acquisitions | 70 |
Additions | 209 | 700
Transfers | (167) | 5,130
Change in reclamation provision | 0 | 0
Disposals | (650) | (345)
Effect of movements in exchange rates | 252 | (30)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 84,080 | 84,366
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (78,119) | (74,246)
Depreciation charge | 1,857 | 4,246
Change in reclamation provision | 0 | 0
Disposals | 649 | 345
Effect of movements in exchange rates | (249) | (28)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (79,576) | (78,119)
Under constructions [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 130,402 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 0 | 0
Additions | 0 | 0
Disposals | 0 |
Depreciation charge | 0 | 0
Transfers | 0 | 0
Right-of-use assets - end of year | 0 | 0
Property, plant and equipment - End of year | 197,792 | 130,402
Under constructions [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 167,200 | 139,051
Acquisitions | 2,216 |
Additions | 129,734 | 87,637
Transfers | (63,518) | (52,797)
Change in reclamation provision | 0 | 0
Disposals | (1,046) | (6,691)
Effect of movements in exchange rates | 4 | 0
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 234,590 | 167,200
Under constructions [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (36,798) | (36,798)
Depreciation charge | 0 | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | 0 | 0
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (36,798) | (36,798)
Exploration and evaluation [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 614,992 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 0 | 0
Additions | 0 | 0
Disposals | 0 |
Depreciation charge | 0 | 0
Transfers | 0 | 0
Right-of-use assets - end of year | 0 | 0
Property, plant and equipment - End of year | 621,163 | 614,992
Exploration and evaluation [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 1,073,239 | 1,125,483
Acquisitions | 0 |
Additions | 193 | 120
Transfers | 0 | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | 14,802 | (52,364)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 1,088,234 | 1,073,239
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (458,247) | (483,663)
Depreciation charge | 0 | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | (8,824) | (25,416)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | $ (467,071) | $ (458,247)

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