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Income taxes - Disclosure of unrecognized deferred tax assets (Details) - CAD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 79,515	$ 57,336
Non-capital losses carried forward [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	64,650	43,379
Mineral stream interests - Mexico [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	7,446	5,796
Unrealized losses on investments [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	3,598	6,529
Capital losses [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	2,127	0
Other [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 1,694	$ 1,632