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INVENTORIES
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories INVENTORIES
 September 30, 2021December 31, 2020
 Concentrates and work-in-progress(1)
$27,095 $25,768 
 Inventory of ore in stockpiles241 241 
 Raw materials and consumables3,258 2,912 
 $30,594 $28,921 
Inventories
   Current$29,248 $27,575 
   Long term - raw materials and consumables1,346 1,346 
$30,594 $28,921 
(1) For the three and nine months ended September 30, 2021, the Company recorded no impairment loss in the Consolidated Statement of Operations related to concentrates and work in progress inventories (September 30, 2020 - $0.14 million and $1.64 million, respectively).