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KEY SOURCES OF ESTIMATION UNCERTAINTY AND CRITICAL ACCOUNTING JUDGMENTS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
KEY SOURCES OF ESTIMATION UNCERTAINTY AND CRITICAL ACCOUNTING JUDGMENTS [Abstract] |  |
Mineral, royalty and other interests | $ 365,477 | $ 402,785
Mineral, royalty and other interests impairments | $ 9,104 | $ 2,507

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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_99&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Key Source Of Estimation Uncertainity And Critical Accounting Judgements [Abstract]. + References No definition available. + Details
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- Definition Mineral streams, royalties and other mining interests accounted for under IFRS 6: Exploration and evaluation assets and IAS 16: Property, plant and equipment. + References No definition available. + Details
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