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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, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]    
Total financial assets $ 142,213 $ 140,653
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 24,327 23,904
Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 23,655 1,159
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 46,668 95,796
Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 47,563 19,794
Level 1 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 107,279 115,590
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, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 13,048 0
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 46,668 95,796
Level 1 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 47,563 19,794
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, oil and gas [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, oil and gas [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 34,934 25,063
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 24,327 23,904
Level 3 [Member] | Warrants on equity securities and convertible debentures and notes [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 10,607 1,159
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 0 0
Level 3 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income $ 0 $ 0