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SEGMENT INFORMATION - Narrative (Details)	Jun. 30, 2018 minesite_grouping investment company minesite
Disclosure of operating segments [line items]
Number of minesites	11
Number of minesite groupings | minesite_grouping	1
Number of publicly traded companies | company	1
Number of investments | investment	1
Operating segments
Disclosure of operating segments [line items]
Number of minesites	4

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Number of Minesite Groupings

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