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INVENTORIES (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
 
December 31, 2018
 
December 31, 2017
 Concentrates and work-in-progress (a)
$
14,746

 
$
14,118

 Inventory of ore in stockpiles
883

 
—

 Raw materials and consumables
2,693

 
2,432

 
$
18,322

 
$
16,550

Inventories - by duration
 
 
 
   Current
$
16,550

 
$
16,550

   Long term - raw materials and consumables
$
1,772

 
$
—

 
$
18,322

 
$
16,550

(a)
For the year ended December 31, 2018, the Company recorded an impairment loss of $4.58 million in the statement of operations related to concentrates and work in progress inventories (December 31, 2017 - $3.31 million).