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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)