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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
September 30, 2017
 
December 31, 2016
 Concentrates and work-in-progress
$
12,354

 
$
13,788

 Raw materials and consumables
2,539

 
2,973

 
$
14,893

 
$
16,761