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Segment disclosure - Disclosure of detailed information about exploration, evaluation and development of mining projects (Detail) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets      
Inventories $ 18,596 $ 10,025  
Mining interests, plant and equipment 635,655 489,512 $ 343,693
Exploration and evaluation assets 3,635 42,519 $ 42,949
Total assets 2,370,622 2,397,104  
Mining exploration, evaluation and development [Member]      
Assets      
Inventories 18,596 27,304  
Mining interests, plant and equipment 559,332 407,000  
Exploration and evaluation assets 3,635 41,869  
Total assets 703,110 802,144  
Canada [Member] | Mining exploration, evaluation and development [Member]      
Assets      
Inventories 13,933 1,599  
Mining interests, plant and equipment 455,849 344,903  
Exploration and evaluation assets 3,635 40,680  
Total assets 627,937 704,998  
Mexico [Member] | Mining exploration, evaluation and development [Member]      
Assets      
Inventories 4,663 25,705  
Mining interests, plant and equipment 103,483 62,097  
Exploration and evaluation assets 0 1,189  
Total assets $ 75,173 $ 97,146