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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)