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INCOME TAXES (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]      
Plant, equipment and mining properties $ 38,743 $ 32,158 $ 28,076
Exploration and evaluation assets 46,781 43,338 30,792
Reclamation provision and other 10,799 11,638 6,963
Unrecognized deductible temporary differences [Member]      
Disclosure of other provisions [line items]      
Tax losses carried forward 13,790 13,973 17,350
Share issue costs 1,263 1,100 1,466
Plant, equipment and mining properties 6,096 6,198 3,873
Exploration and evaluation assets 1,207 1,330 1,257
Investments 44 198 189
Reclamation provision and other 9,489 10,054 5,603
Unrecognized deductible temporary differences $ 31,889 $ 32,853 $ 29,739