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Property, plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year $ 3,720,672  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 8,149 $ 0
Additions 2,221 10,136
Disposals (787) (9)
Depreciation charge (1,774) (1,978)
Transfers (1,539)  
Right-of-use assets - end of year 6,270 8,149
Property, plant and equipment - End of year 3,771,557 3,720,672
Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 9,013,446 9,009,461
Additions 77,462 75,211
Transfers 1,539 0
Change in reclamation provision 151,558 24,883
Disposals (10,953) (5,751)
Effect of movements in exchange rates 34,570 (90,358)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 9,267,622 9,013,446
Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (5,300,923) (5,127,535)
Depreciation charge (176,821) (236,336)
Change in reclamation provision [1] (23,921) (2,732)
Disposals 9,350 3,197
Effect of movements in exchange rates (10,020) 62,483
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year (5,502,335) (5,300,923)
Land and buildgings [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,116,673  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 2,646 0
Additions 75 3,517
Disposals (40) 0
Depreciation charge (875) (871)
Transfers 0  
Right-of-use assets - end of year 1,806 2,646
Property, plant and equipment - End of year 2,194,847 2,116,673
Land and buildgings [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 5,050,115 5,039,313
Additions 2,030 2,327
Transfers 37,971 17,157
Change in reclamation provision 151,558 24,883
Disposals (1,678) (923)
Effect of movements in exchange rates (15,663) (32,642)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 5,224,333 5,050,115
Land and buildgings [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (2,936,088) (2,835,037)
Depreciation charge (84,261) (128,579)
Change in reclamation provision [1] (23,921) (2,732)
Disposals 903 225
Effect of movements in exchange rates 12,075 30,035
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year (3,031,292) (2,936,088)
Plant and equipment [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 890,200  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 5,084 0
Additions 22 5,768
Disposals (747) (9)
Depreciation charge (498) (675)
Transfers (1,539)  
Right-of-use assets - end of year 2,322 5,084
Property, plant and equipment - End of year 825,830 890,200
Plant and equipment [member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,678,165 2,654,944
Additions 7,097 7,179
Transfers 21,405 28,453
Change in reclamation provision 0 0
Disposals (3,385) (3,486)
Effect of movements in exchange rates (3,438) (8,925)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 2,699,844 2,678,165
Plant and equipment [member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (1,793,049) (1,697,178)
Depreciation charge (89,550) (105,700)
Change in reclamation provision 0 0
Disposals 2,997 2,194
Effect of movements in exchange rates 3,266 7,635
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year (1,876,336) (1,793,049)
Furniture and fixtures [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 4,687  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 419 0
Additions 2,124 851
Disposals 0 0
Depreciation charge (401) (432)
Transfers 0  
Right-of-use assets - end of year 2,142 419
Property, plant and equipment - End of year 6,807 4,687
Furniture and fixtures [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 80,869 80,083
Additions 855 158
Transfers 2,554 951
Change in reclamation provision 0 0
Disposals (5,299) (142)
Effect of movements in exchange rates (68) (181)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 78,911 80,869
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (76,601) (74,860)
Depreciation charge (3,010) (2,057)
Change in reclamation provision 0 0
Disposals 5,299 139
Effect of movements in exchange rates 66 177
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year (74,246) (76,601)
Under constructions [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 95,658  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0 0
Right-of-use assets - end of year 0 0
Property, plant and equipment - End of year 102,253 95,658
Under constructions [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 132,457 114,060
Additions 67,477 65,482
Transfers (60,391) (46,561)
Change in reclamation provision 0 0
Disposals (492) (507)
Effect of movements in exchange rates 0 (17)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 139,051 132,457
Under constructions [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (36,799) (36,799)
Depreciation charge 0 0
Change in reclamation provision 0 0
Disposals 1 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) (36,799)
Exploration and evaluation [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 613,454  
Disclosure of quantitative information about right of use assets [Abstract]    
Right-of-use assets - beginning of year 0 0
Right-of-use assets - end of year 0 0
Property, plant and equipment - End of year 641,820 613,454
Exploration and evaluation [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,071,840 1,121,061
Additions 3 65
Transfers 0 0
Change in reclamation provision 0 0
Disposals (99) (693)
Effect of movements in exchange rates 53,739 (48,593)
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year 1,125,483 1,071,840
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year (458,386) (483,661)
Depreciation charge 0 0
Change in reclamation provision 0 0
Disposals 150 639
Effect of movements in exchange rates (25,427) 24,636
Disclosure of quantitative information about right of use assets [Abstract]    
Property, plant and equipment - End of year $ (483,663) $ (458,386)
[1]

Asset retirement obligation assets are adjusted when the Company updates its reclamatio n provisions due to new cash flow estimates or changes in discount and inflation rates. When the assets of an operation have been written off due to an impairment, as is the case with our Rabbit Lake operation and some of our operations in the United States , the adjustment is recorded directly to the statement of earnings as other operating expense or income .