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Income taxes - Disclosure of components of deferred income tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:      
Stream interests $ 30,100 $ 34,278 $ 28,826
Non-capital losses 7,663 8,195 170
Deferred and restricted share units 3,401 4,008 2,865
Share and debt issue expenses 2,935 4,562 (113)
Deferred tax assets 44,099 51,043  
Deferred tax liabilities:      
Royalty interests and exploration and evaluation assets (102,782) (93,266) (77,641)
Investments (8,077) (9,437) 1,911
Convertible debentures (1,173) (2,315) (3,632)
Other (474) (454) 149
Deferred tax liabilities (112,506) (105,472)  
Deferred tax liability, net $ (68,407) $ (54,429) $ (47,465)