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Inventory
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Inventory
7.
INVENTORY
 
               December 31,
2019 		   
December 31, 
2018 
 
 Heap leach ore (current and
non-current)
    $                158,598    $                127,077  
 Less:
Non-current
portion of heap leach ore
        (141,578)    (100,543) 
 Current portion of heap leach ore
     17,020     26,534  
 Stockpiles
     9,776     -  
 Work-in-process
     6,366     5,475  
 Supplies
     12,329     10,005  
 Finished goods
        771     931  
 Current inventory
       $46,262    $42,945  
Non-current
inventory relates to heap leach ore at Mesquite not expected to be recovered in the next year.