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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ISSUED AND RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2017
USD ($)
$ / oz
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Oct. 20, 2016
$ / oz
Available-for-sale securities $ 3,700 $ 0    
Realized gain on available-for-sale security   $ 2,340 $ (183)  
Minimum | Gold forward contracts        
Term of the contract 10 days      
Maximum | Gold forward contracts        
Term of the contract 3 months      
Mount Milligan        
Cash payment for each ounce of gold (in dollars per ounce) | $ / oz 435     435