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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)

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