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INCOME AND MINING TAXES (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income and mining taxes [Line Items] |  |
Applicable tax rate | 26.30% | 26.30%
Unused tax losses for which no deferred tax asset recognised | $ 783.9 | $ 196.6
Other temporary differences [member] |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 40.3 |
Mining Tax [Member] |  |
Income and mining taxes [Line Items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 634.6 | $ 0.0
Scenario, Plan [Member] |  |
Income and mining taxes [Line Items] |  |
Applicable tax rate | 21.00% | 35.00%
Canada [Member] | Unused Capital Losses [Member] |  |
Income and mining taxes [Line Items] |  |
Unused Capital Losses For Which No Deferred Tax Assets Recognized | $ 146.0 |
Canada [Member] | Bottom of range [member] | Unused tax losses [member] |  |
Income and mining taxes [Line Items] |  |
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits | 2018 |
Canada [Member] | Top of range [member] | Unused tax losses [member] |  |
Income and mining taxes [Line Items] |  |
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits | 2036 |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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