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17. INCOME TAXES (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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)