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INVENTORIES (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
June 30, 2017
 
December 31, 2016
 Concentrates and work-in-progress
$
10,563

 
$
13,788

 Raw materials and consumables
2,783

 
2,973

 
$
13,346

 
$
16,761