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VALUE ADDED TAX RECEIVABLE (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Trade and other receivables [abstract]    
Current (note 5) $ 7,004,000 $ 13,462,000
Non-current (note 8) 6,751,000 6,531,000
Value added tax receivable 13,755,000 19,993,000
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Amount provided for VAT receivables   0
VAT receivable | Argentina    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Amount provided for VAT receivables $ 3,603,000 $ 3,365,000