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Fair value of financial instruments (Details) - CAD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets at fair value $ 19,393 $ 33,819
Financial assets at fair value through profit or loss | Warrants on equity securities publicly traded mining exploration and development companies, precious metals    
Disclosure of financial assets [line items]    
Financial assets at fair value 4 18
Financial assets at fair value through other comprehensive loss | Equity securities publicly traded mining exploration and development companies, precious metals    
Disclosure of financial assets [line items]    
Financial assets at fair value 5,739 9,537
Financial assets at fair value through other comprehensive loss | Equity securities publicly traded mining exploration and development companies, other minerals    
Disclosure of financial assets [line items]    
Financial assets at fair value 13,650 24,264
Level 1    
Disclosure of financial assets [line items]    
Financial assets at fair value 19,389 33,801
Level 1 | Financial assets at fair value through other comprehensive loss | Equity securities publicly traded mining exploration and development companies, precious metals    
Disclosure of financial assets [line items]    
Financial assets at fair value 5,739 9,537
Level 1 | Financial assets at fair value through other comprehensive loss | Equity securities publicly traded mining exploration and development companies, other minerals    
Disclosure of financial assets [line items]    
Financial assets at fair value 13,650 24,264
Level 3    
Disclosure of financial assets [line items]    
Financial assets at fair value 4 18
Level 3 | Financial assets at fair value through profit or loss | Warrants on equity securities publicly traded mining exploration and development companies, precious metals    
Disclosure of financial assets [line items]    
Financial assets at fair value $ 4 $ 18