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INVENTORIES
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
 March 31, 2021December 31, 2020
 Concentrates and work-in-progress(1)
$25,947 $25,768 
 Inventory of ore in stockpiles241 241 
 Raw materials and consumables3,134 2,912 
 $29,322 $28,921 
Inventories - by duration
   Current$27,976 $27,575 
   Long term - raw materials and consumables1,346 1,346 
$29,322 $28,921 
(1) For the three months ended March 31, 2021, the Company recorded an impairment loss of nil in the statement of operations related to concentrates and work in progress inventories (March 31, 2020 - $1.08 million).