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Property, plant and equipment (Schedule of Property plant and equipment table) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | $ 3,368,772 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 10,799 | $ 9,452
Additions | 1,101 | 4,368
Disposals |  | (214)
Depreciation charge | (2,514) | (2,478)
Transfers | (54) | (329)
Right-of-use assets - end of year | 9,332 | 10,799
Property, plant and equipment - End of year | 3,286,515 | 3,368,772
Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 9,507,370 | 9,416,351
Additions | 211,635 | 153,631
Transfers | 54 | 329
Change in reclamation provision | (54,991) | (5,343)
Disposals | (4,769) | (19,406)
Effect of movements in exchange rates | 72,048 | (38,192)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 9,731,347 | 9,507,370
Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (6,149,397) | (5,952,313)
Depreciation charge | 274,593 | 249,535
Transfers |  | 0
Change in reclamation provision | 37,683 | 7,509
Disposals | 3,352 | 17,129
Effect of movements in exchange rates | (71,209) | 27,813
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (6,454,164) | (6,149,397)
Land and buildings [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 1,808,660 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 8,326 | 5,959
Additions | 696 | 3,398
Disposals |  | 0
Depreciation charge | (1,291) | (1,003)
Transfers | (26) | (28)
Right-of-use assets - end of year | 7,705 | 8,326
Property, plant and equipment - End of year | 1,700,319 | 1,808,660
Land and buildings [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 5,213,324 | 5,197,138
Additions | 206 | 9,062
Transfers | 72,014 | 40,011
Change in reclamation provision | (54,991) | (5,343)
Disposals | (210) | (13,604)
Effect of movements in exchange rates | 54,888 | (13,940)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 5,285,231 | 5,213,324
Land and buildings [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (3,412,990) | (3,300,869)
Depreciation charge | 164,525 | 146,574
Transfers |  | 0
Change in reclamation provision | 37,683 | 7,509
Disposals | 14 | 13,604
Effect of movements in exchange rates | (52,799) | 13,340
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (3,592,617) | (3,412,990)
Plant and equipment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 738,985 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 401 | 1,565
Additions | 385 | 126
Disposals |  | (214)
Depreciation charge | (251) | (399)
Transfers | (28) | (677)
Right-of-use assets - end of year | 507 | 401
Property, plant and equipment - End of year | 738,741 | 738,985
Plant and equipment [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 2,897,605 | 2,812,309
Additions | 734 | 29,498
Transfers | 105,291 | 63,819
Change in reclamation provision | 0 | 0
Disposals | (3,004) | (3,744)
Effect of movements in exchange rates | 15,514 | (4,277)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 3,016,140 | 2,897,605
Plant and equipment [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (2,159,021) | (2,067,999)
Depreciation charge | 105,545 | 98,694
Transfers |  | 11
Change in reclamation provision | 0 | 0
Disposals | 2,064 | 3,456
Effect of movements in exchange rates | (15,404) | 4,227
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (2,277,906) | (2,159,021)
Furniture and fixtures [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 9,115 |
Disclosure of quantitative information about right of use assets [Abstract] |  |
Right-of-use assets - beginning of year | 2,072 | 1,928
Additions | 20 | 844
Disposals |  | 0
Depreciation charge | (972) | (1,076)
Transfers | 0 | 376
Right-of-use assets - end of year | 1,120 | 2,072
Property, plant and equipment - End of year | 7,984 | 9,115
Furniture and fixtures [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 90,719 | 84,080
Additions | 61 | 3,461
Transfers | 4,299 | 3,334
Change in reclamation provision | 0 | 0
Disposals | (1,300) | (69)
Effect of movements in exchange rates | 296 | (87)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 94,075 | 90,719
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (83,676) | (79,576)
Depreciation charge | 4,523 | 4,267
Transfers |  | (11)
Change in reclamation provision | 0 | 0
Disposals | 1,274 | 69
Effect of movements in exchange rates | (286) | 87
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | (87,211) | (83,676)
Under constructions [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 200,482 |
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 | 228,867 | 200,482
Under constructions [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 237,280 | 234,590
Additions | 210,172 | 111,518
Transfers | (181,550) | (106,835)
Change in reclamation provision | 0 | 0
Disposals | (255) | (1,989)
Effect of movements in exchange rates | 18 | (4)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 265,665 | 237,280
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 | 611,530 |
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 | 610,604 | 611,530
Exploration and evaluation [Member] | Cost [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | 1,068,442 | 1,088,234
Additions | 462 | 92
Transfers | 0 | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | 1,332 | (19,884)
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | 1,070,236 | 1,068,442
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property, plant and equipment - Beginning of year | (456,912) | (467,071)
Depreciation charge | 0 | 0
Transfers |  | 0
Change in reclamation provision | 0 | 0
Disposals | 0 | 0
Effect of movements in exchange rates | (2,720) | 10,159
Disclosure of quantitative information about right of use assets [Abstract] |  |
Property, plant and equipment - End of year | $ (459,632) | $ (456,912)

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