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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

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