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FINANCIAL RISK MANAGEMENT - Market Currency Risk (Details) - Currency risk - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Canadian dollar |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | $ (11,269) | $ (1,361)
Canadian dollar | Cash |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 5,342 | 15,325
Canadian dollar | Value added tax receivable |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 206 | 398
Canadian dollar | Other financial assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 200 | 0
Canadian dollar | Trade and other payables (excluding VAT and income taxes) |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | (17,017) | (17,084)
Canadian dollar | Provisions |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 0 | 0
Argentine peso |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | (21,959) | 7,065
Argentine peso | Cash |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 17,223 | 11,858
Argentine peso | Value added tax receivable |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 12,242 | 17,826
Argentine peso | Other financial assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 884 | 1,184
Argentine peso | Trade and other payables (excluding VAT and income taxes) |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | (5,021) | (16,474)
Argentine peso | Provisions |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | $ (47,287) | $ (7,329)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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