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Property, plant and equipment (Schedule of Property plant and equipment table) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | $ 3,473,490 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 9,452 | $ 4,156
Additions | 4,368 | 7,853
Disposals | (214) | (11)
Depreciation charge | (2,478) | (2,117)
Transfers | (329) | (429)
Right-of-use assets - end of year | 10,799 | 9,452
Property, plant and equipment - End of year | 3,368,772 | 3,473,490
Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 9,416,351 | 9,209,575
Acquisitions |  | 97,930
Additions | 153,631 | 143,448
Transfers | 329 | 429
Change in reclamation provision | (5,343) | (93,451)
Disposals | (19,406) | (15,004)
Effect of movements in exchange rates | (38,192) | 73,424
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 9,507,370 | 9,416,351
Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (5,952,313) | (5,637,132)
Depreciation charge | 249,535 | 241,323
Transfers | 0 |
Change in reclamation provision | 7,509 | (22,944)
Disposals | 17,129 | 13,701
Effect of movements in exchange rates | 27,813 | (64,615)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (6,149,397) | (5,952,313)
Land and buildings [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 1,902,228 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 5,959 | 931
Additions | 3,398 | 5,917
Disposals | 0 | 0
Depreciation charge | (1,003) | (870)
Transfers | (28) | (19)
Right-of-use assets - end of year | 8,326 | 5,959
Property, plant and equipment - End of year | 1,808,660 | 1,902,228
Land and buildings [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 5,197,138 | 5,152,209
Acquisitions |  | 67,998
Additions | 9,062 | 4,385
Transfers | 40,011 | 25,023
Change in reclamation provision | (5,343) | (93,451)
Disposals | (13,604) | (4,885)
Effect of movements in exchange rates | (13,940) | 45,859
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 5,213,324 | 5,197,138
Land and buildings [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (3,300,869) | (3,101,740)
Depreciation charge | 146,574 | 137,543
Transfers | 0 |
Change in reclamation provision | 7,509 | (22,944)
Disposals | 13,604 | 4,851
Effect of movements in exchange rates | 13,340 | (43,493)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (3,412,990) | (3,300,869)
Plant and equipment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 745,875 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 1,565 | 1,584
Additions | 126 | 1,330
Disposals | (214) | (11)
Depreciation charge | (399) | (560)
Transfers | (677) | (778)
Right-of-use assets - end of year | 401 | 1,565
Property, plant and equipment - End of year | 738,985 | 745,875
Plant and equipment [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 2,812,309 | 2,732,561
Acquisitions |  | 27,646
Additions | 29,498 | 8,927
Transfers | 63,819 | 39,091
Change in reclamation provision | 0 | 0
Disposals | (3,744) | (8,423)
Effect of movements in exchange rates | (4,277) | 12,507
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 2,897,605 | 2,812,309
Plant and equipment [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (2,067,999) | (1,962,228)
Depreciation charge | 98,694 | 101,923
Transfers | (11) |
Change in reclamation provision | 0 | 0
Disposals | 3,456 | 8,201
Effect of movements in exchange rates | 4,227 | (12,049)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (2,159,021) | (2,067,999)
Furniture and fixtures [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 6,432 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 1,928 | 1,641
Additions | 844 | 606
Disposals | 0 | 0
Depreciation charge | (1,076) | (687)
Transfers | 376 | 368
Right-of-use assets - end of year | 2,072 | 1,928
Property, plant and equipment - End of year | 9,115 | 6,432
Furniture and fixtures [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 84,080 | 84,366
Acquisitions |  | 70
Additions | 3,461 | 209
Transfers | 3,334 | (167)
Change in reclamation provision | 0 | 0
Disposals | (69) | (650)
Effect of movements in exchange rates | (87) | 252
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 90,719 | 84,080
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (79,576) | (78,119)
Depreciation charge | 4,267 | 1,857
Transfers | 11 |
Change in reclamation provision | 0 | 0
Disposals | 69 | 649
Effect of movements in exchange rates | 87 | (249)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (83,676) | (79,576)
Under constructions [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 197,792 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 0 | 0
Additions | 0 | 0
Disposals | 0 | 0
Depreciation charge | 0 | 0
Transfers | 0 | 0
Right-of-use assets - end of year | 0 | 0
Property, plant and equipment - End of year | 200,482 | 197,792
Under constructions [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 234,590 | 167,200
Acquisitions |  | 2,216
Additions | 111,518 | 129,734
Transfers | (106,835) | (63,518)
Change in reclamation provision | 0 | 0
Disposals | (1,989) | (1,046)
Effect of movements in exchange rates | (4) | 4
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 237,280 | 234,590
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
Transfers | 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 | 621,163 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 0 | 0
Additions | 0 | 0
Disposals | 0 | 0
Depreciation charge | 0 | 0
Transfers | 0 | 0
Right-of-use assets - end of year | 0 | 0
Property, plant and equipment - End of year | 611,530 | 621,163
Exploration and evaluation [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 1,088,234 | 1,073,239
Acquisitions |  | 0
Additions | 92 | 193
Transfers | 0 | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | (19,884) | 14,802
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 1,068,442 | 1,088,234
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (467,071) | (458,247)
Depreciation charge | 0 | 0
Transfers | 0 |
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | 10,159 | (8,824)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | $ (456,912) | $ (467,071)

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