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ACQUISITIONS - Other (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 03, 2018 | Jun. 29, 2018 | Jun. 28, 2018
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Mara Rosa |  |  |
Acquisitions |  |  |
Net smelter return (NSR) (as a percent) |  | 1.75% | 1.00%
Consideration paid |  | $ 10.8 | $ 10.8
CORE |  |  |
Acquisitions |  |  |
Shares acquired | 127,188 |  | 682,556
Share price | $ 26 |  | $ 26

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