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Fair value of financial instruments - Disclosure of significant observable inputs used in fair value measurement of equity (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Total financial assets $ 59,109 $ 107,403
Warrants and call options on 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 profit or loss 1,067 3,322
Warrants and call options on 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 profit or loss 633 26
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 48,295 35,544
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 9,114 12,259
Equity securities [Member] | Private 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   56,252
Level 1 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 57,409 47,803
Level 1 [Member] | Warrants and call options on 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 profit or loss 0 0
Level 1 [Member] | Warrants and call options on 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 profit or loss 0 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 48,295 35,544
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 9,114 12,259
Level 1 [Member] | Equity securities [Member] | Private 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
Level 2 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 0 0
Level 2 [Member] | Warrants and call options on 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 profit or loss 0 0
Level 2 [Member] | Warrants and call options on 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 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 2 [Member] | Equity securities [Member] | Private 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
Level 3 [Member]    
Disclosure of fair value measurement of assets [line items]    
Total financial assets 1,700 59,600
Level 3 [Member] | Warrants and call options on 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 profit or loss 1,067 3,322
Level 3 [Member] | Warrants and call options on 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 profit or loss 633 26
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
Level 3 [Member] | Equity securities [Member] | Private 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   $ 56,252