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Fair value of financial instruments - Disclosure of significant observable inputs used in fair value measurement (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value measurement of assets [line items]    
Total financial assets $ 42,554 $ 142,212
Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 18,026 24,327
Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 6,191 23,655
Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 9,818 46,668
Equity securities [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 8,519 47,562
Level 1 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 15,651 107,278
Level 1 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 0 0
Level 1 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 844 13,048
Level 1 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 6,288 46,668
Level 1 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 8,519 47,562
Level 2 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 0 0
Level 2 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 0 0
Level 2 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 0 0
Level 2 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 0 0
Level 2 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 0 0
Level 3 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 26,903 34,934
Level 3 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 18,026 24,327
Level 3 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 5,347 10,607
Level 3 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 3,530 0
Level 3 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income $ 0 $ 0