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EXPLORATION EXPENDITURES (Tables)
6 Months Ended
Dec. 31, 2019
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Schedule of exploration expenditures

 

   For the Three Months Ended
December 31,
   For the Six Months Ended
December 31,
 
   2019   2018   2019   2018 
Technical studies and engineering  $6   $1,041   $23   $1,650 
Field management and other   405    144    570    273 
Metallurgical development   43    43    84    82 
Total  $454   $1,228   $677   $2,005