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INCOME TAXES (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Plant, equipment and mining properties $ 35,658 $ 38,743  
Exploration and evaluation assets 9,827 46,781 $ 43,338
Reclamation provision and other 1,524 10,799  
Unrecognized deductible temporary differences [Member]      
Disclosure of other provisions [line items]      
Tax losses carried forward 24,229 13,790  
Share issue costs 1,352 1,263  
Plant, equipment and mining properties 170 6,096  
Exploration and evaluation assets 1,237 1,207  
Investments (1,273) 44  
Reclamation provision and other 9,489  
Unrecognized deductible temporary differences $ 25,721 $ 31,889