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17. INCOME TAXES (Details 2) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | $ 22,924 | $ 20,750 |
Set-off against deferred income tax liabilities | (22,924) | (20,750) |
Deferred income tax assets-per balance sheet | 0 | 0 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (37,106) | (35,771) |
Set-off of deferred income tax assets | 22,924 | 20,750 |
Deferred income tax liabilities-per balance sheet | (14,182) | (15,021) | $ (16,465)
Property, plant and equipment, net |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 779 | 662 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (35,106) | (33,949) |
Post-employment benefits |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 492 | 480 |
Reclamation Obligations |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 6,613 | 6,120 |
Other liabilities |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 0 | 177 |
Tax loss carry forwards |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 9,340 | 8,781 |
Other |  |  |
DisclosureOfDeferredIncomeTaxAssetsAndLiabilitiesLineItems [Line Items] |  |  |
Deferred income tax assets-gross | 5,700 | 4,530 |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (901) | (934) |
Inventory |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (591) | (554) |
Investments |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | (519) | (274) |
Investments in associates |  |  |
Deferred income tax liabilities: |  |  |
Deferred income tax liabilities-gross | $ 11 | $ (60) |

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