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Income taxes - Disclosure of components of deferred income tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:      
Stream interests $ 26,753 $ 30,100 $ 34,278
Non-capital losses 14,375 7,663 8,195
Deferred and restricted share units 3,644 3,401 4,008
Share and debt issue expenses 2,720 2,935 4,562
Deferred tax assets 47,492 44,099  
Deferred tax liabilities:      
Royalty interests and exploration and evaluation assets (133,120) (102,782) (93,266)
Investments (706) (8,077) (9,437)
Convertible debentures 0 (1,173) (2,315)
Other (238) (474) (454)
Deferred tax liabilities (134,064) (112,506)  
Deferred tax liability, net $ (86,572) $ (68,407) $ (54,429)