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EXPLORATION EXPENDITURES
9 Months Ended
Mar. 31, 2018
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
EXPLORATION EXPENDITURES
  9. Exploration Expenditures

 

    For the Three Months Ended March 31,     For the Nine Months Ended March 31,  
    2018     2017     2018     2017  
Technical studies and engineering   $ 266     $ 1,994     $ 720     $ 3,982  
Field management and other     141       371       483       1,004  
Metallurgical development     51       366       223       2,057  
Geologists and field staff     24       30       72       85  
 Total   $ 482     $ 2,761     $ 1,498     $ 7,128