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INCOME TAXES (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]      
Reclamation provision $ 10,799 $ 11,638 $ 6,963
Inventory 9,231 9,102 5,804
Exploration and evaluation assets 46,781 43,338 30,792
Plant, equipment and mining properties 38,743 32,158 28,076
Net deferred income tax liabilities (3,903) (4,548) (4,688)
Deferred income tax assets and liabilities [Member]      
Disclosure of other provisions [line items]      
Reclamation provision 491 594 503
Non-capital losses 3,104 3,197
Other deductible temporary differences 1,059 1,097 2,328
Inventory (94) (230) (101)
Exploration and evaluation assets (6,378) (6,464) (4,265)
Plant, equipment and mining properties (2,085) (2,742) (3,153)
Net deferred income tax liabilities $ (3,903) $ (4,548) $ (4,688)