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22. SUPPLEMENTAL FINANCIAL INFORMATION (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense $ (3,357) $ (2,812)
Mining, other development expense    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense (5) (13)
Milling, conversion expense    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense (2,989) (2,411)
Cost of services    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense (234) (268)
Exploration and evaluation    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense (95) (60)
General and administrative    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense (34) (34)
Discontinued operations    
DisclosureOfDepreciationExpenseLineItems [Line Items]    
Depreciation expense $ 0 $ (26)