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FINANCIAL RISK MANAGEMENT - Market Currency Risk (Details) - Currency risk - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Canadian dollar |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | $ (14,847) | $ (11,269)
Canadian dollar | Cash |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 7,982 | 5,342
Canadian dollar | Value added tax receivable |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 145 | 206
Canadian dollar | Other financial assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure |  | 200
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 | (22,974) | (17,017)
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 | (10,321) | (21,959)
Argentine peso | Cash |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 1,604 | 17,223
Argentine peso | Value added tax receivable |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | 17,039 | 12,242
Argentine peso | Other financial assets |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure |  | 884
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 | (9,908) | (5,021)
Argentine peso | Provisions |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure | $ (19,056) | $ (47,287)

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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 2018-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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