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22. SUPPLEMENTAL FINANCIAL INFORMATION (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfOtherIncomeExpenseLineItems [Line Items]    
Other Gains Losses $ 2,210 $ 906
Gains (losses) on: Disposal of property, plant and equipment    
DisclosureOfOtherIncomeExpenseLineItems [Line Items]    
Other Gains Losses 21 (162)
Gains (losses) on: Investment fair value through profit (loss)    
DisclosureOfOtherIncomeExpenseLineItems [Line Items]    
Other Gains Losses 1,891 1,473
Gains (losses) on: Extinguishment of toll milling contract liability    
DisclosureOfOtherIncomeExpenseLineItems [Line Items]    
Other Gains Losses 679 0
Gains (losses) on: Other    
DisclosureOfOtherIncomeExpenseLineItems [Line Items]    
Other Gains Losses $ (381) $ (405)