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9. INVESTMENTS (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning $ 3,760 $ 7,778
Fair value changes through profit and loss 1,891 1,473
Fair value changes through OCI 4 3
Foreign exchange 2,425 410
Investments, ending 36,002 3,760
Equity instruments    
DisclosureOfInvestmentsLineItems [Line Items]    
Purchases, equity 149 215
Sales, equity 0 (760)
Debt instruments    
DisclosureOfInvestmentsLineItems [Line Items]    
Purchases, debt 29,740 0
Sales, debt (1,967) (7,763)
Option agreement    
DisclosureOfInvestmentsLineItems [Line Items]    
Acquisition, divestitures 0 1,242
African Mining Division divestiture    
DisclosureOfInvestmentsLineItems [Line Items]    
Acquisition, divestitures $ 0 $ 1,162