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Mineral interests (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Statement [Line Items]      
Balance, beginning of the year $ 160,693,000 $ 160,772,000  
Sale of Homestake Resources (note 3) (16,460,000)    
Option payment received   (260,000)  
Purchase of Homestake Ridge royalty   400,000  
Disposition of mineral interests   50,000  
Change in estimate of provision for site reclamation and closure (723,000) (169,000)  
Balance, end of the year 143,510,000 160,693,000  
British Columbia      
Statement [Line Items]      
Balance, beginning of the year 16,460,000 16,060,000  
Sale of Homestake Resources (note 3) (16,460,000)    
Option payment received   0  
Purchase of Homestake Ridge royalty   400,000  
Disposition of mineral interests   0  
Change in estimate of provision for site reclamation and closure 0 0  
Balance, end of the year 0 16,460,000  
Nunavut      
Statement [Line Items]      
Balance, beginning of the year 19,139,000 19,358,000  
Sale of Homestake Resources (note 3) 0    
Option payment received   0  
Purchase of Homestake Ridge royalty   0  
Disposition of mineral interests   0  
Change in estimate of provision for site reclamation and closure (332,000) (219,000)  
Balance, end of the year 18,807,000 19,139,000  
Quebec      
Statement [Line Items]      
Balance, beginning of the year 125,094,000 125,354,000  
Sale of Homestake Resources (note 3) 0    
Option payment received   (260,000)  
Purchase of Homestake Ridge royalty     $ 0
Disposition of mineral interests   50,000  
Change in estimate of provision for site reclamation and closure (391,000) 50,000  
Balance, end of the year $ 124,703,000 $ 125,094,000