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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
June 30, 2019
 
December 31, 2018
 Concentrates and work-in-progress
$
16,725

 
$
14,746

 Inventory of ore in stockpiles
749

 
883

 Raw materials and consumables
2,872

 
2,693

 
$
20,346

 
$
18,322

Inventories - by duration


 


   Current
$
18,574

 
$
16,550

   Long term - raw materials and consumables
1,772

 
1,772


$
20,346

 
$
18,322