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INCOME TAXES (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Reclamation provision $ 1,524 $ 10,799  
Inventory 5,592 9,231  
Exploration and evaluation assets 9,827 46,781 $ 43,338
Plant, equipment and mining properties 35,658 38,743  
Net deferred income tax liabilities (2,938) (3,903)  
Deferred income tax assets and liabilities [Member]      
Disclosure of other provisions [line items]      
Reclamation provision 571 491  
Non-capital losses 1,171 3,104  
Other deductible temporary differences 1,013 1,059  
Inventory (243) (94)  
Exploration and evaluation assets (3,340) (6,378)  
Plant, equipment and mining properties (2,110) (2,085)  
Net deferred income tax liabilities $ (2,938) $ (3,903)