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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

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