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OPERATIONS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details)
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9 Months Ended |
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Mar. 31, 2015
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| OPERATIONS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS | |
| Minimum number of metals produced from a mine of which right to purchase all or a portion available in exchange for upfront deposit | 1 |