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MAJOR SOURCES OF REVENUE (Details) - Sales Revenue - Customer Concentration Risk - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Centerra |  |  |
Major sources of revenue |  |  |
Revenue | $ 136,737 | $ 125,438 | $ 94,104
Percentage of total revenue | 31.00% | 34.90% | 33.80%
Barrick |  |  |
Major sources of revenue |  |  |
Revenue | $ 104,009 | $ 49,683 | $ 24,849
Percentage of total revenue | 23.60% | 13.80% | 8.90%
Teck |  |  |
Major sources of revenue |  |  |
Revenue | $ 60,251 | $ 49,243 | $ 38,033
Percentage of total revenue | 13.70% | 13.70% | 13.70%

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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