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INVENTORY (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Tables Abstract  
Schdule of Inventory

   

December 31,

2018

    

December 31,

2017

    

January 1,

2017

  
                   
Process material stockpiles   $ 4,486     $ 3,566     $ 2,605  
Concentrate inventory     3,095       3,437       1,896  
Materials and supplies     1,650       2,099       1,303  
    $ 9,231     $ 9,102     $ 5,804