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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory Tables Abstract  
Schedule of Inventory

   

December 31,

2019

    

December 31,

2018

  
Process material stockpiles   $ 1,079     $ 4,486  
Concentrate inventory     3,055       3,095  
Materials and supplies     1,458       1,650  
    $ 5,592     $ 9,231