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Income taxes - Disclosure of components of deferred income tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Stream interests $ 28,826 $ 7,133 $ 7,793
Deferred and restricted share units 2,865 2,032 2,032
Share and debt issue expenses (113) 989 2,286
Other assets 149 120 223
Non-capital losses 170 0 1,015
Deferred tax assets 31,897 10,274  
Deferred tax liabilities:      
Royalty interests and exploration and evaluation assets (77,641) (88,787) (123,772)
Convertible debentures (3,632) (4,866) (6,047)
Investments 1,911 (3,898) (10,054)
Net deferred tax liabilities (79,362) (97,551)  
Deferred tax liability, net $ (47,465) $ (87,277) $ (126,762)