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KEY SOURCES OF ESTIMATION UNCERTAINTY AND CRITICAL ACCOUNTING JUDGMENTS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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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X

- Definition

Key Source Of Estimation Uncertainity And Critical Accounting Judgements [Abstract].

+ References

No definition available.

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X

- 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.

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