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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 12 Months Ended
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Jun. 30, 2017 USD ($)
Ilovica |
Commitments and Contingencies |
Scheduled payment amount | $ 163,750
Voisey's Bay | Voisey's Bay Holding Corporation |
Commitments and Contingencies |
Ownership percentage held | 90.00%
Voisey's Bay | Altius |
Commitments and Contingencies |
Ownership percentage held | 10.00%

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