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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
September 30, 2018
 
December 31, 2017
 Concentrates and work-in-progress
$
12,088

 
$
14,118

 Raw materials and consumables
3,150

 
2,432

 
$
15,238

 
$
16,550