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DERIVATIVE INSTRUMENTS (Details 1) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Effective portion of change in fair value of hedging instruments [Abstract] |  |  |
Foreign exchange gain on cash and cash equivalents designated as hedging instruments |  | $ 0.0 | $ 4.9
Reclassification of realized foreign exchange gain on cash and cash equivalents designated as hedging instrument |  | 0.0 | 3.2
Unrealized (loss) gain on diesel swap contracts | [1] | (0.4) | 1.2
Realized loss on settlement of diesel swap contracts | [1] | 0.3 | 2.5
Deferred income tax related to hedging instruments | [2] | 0.0 | (1.5)
Total hedging gains (losses) in other comprehensive income |  | $ (0.1) | $ 10.3
[1] | Diesel swap contracts In 2015, the Company entered into diesel swap contracts to hedge diesel cost at Mesquite. Realized gains and losses are reclassified from other comprehensive income to operating expenses as diesel is consumed at the mine site.
[2] | (i) Diesel swap contracts In 2015, the Company entered into diesel swap contracts to hedge diesel cost at Mesquite. Realized gains and losses are reclassified from other comprehensive income to operating expenses as diesel is consumed at the mine site. The Company realized a loss of $0.3 million on settlement of 1.0 million gallons for the year ended December 31, 2017 (2016 – loss of $2.5 million on 5.5 million gallons). The hedge was fully settled as at June 30, 2017.

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_a_i&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_92&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised. + References No definition available. + Details
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