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Inventories, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Stockpiles - underground mine $ 796 $ 648
Stockpiles - open pit mine   41
Concentrates 1,745 1,919
Dore, net [1] 602 459
Subtotal - product inventories 3,143 3,067
Materials and supplies [2] 7,733 6,928
Total 10,876 9,995
Dore    
Inventory reserve 0 368
Materials and supplies    
Inventory reserve $ 209 $ 209
[1] Net of reserve of nil and $368 at September 30, 2021 and December 31, 2020, respectively.
[2] Net of reserve for obsolescence of $209 both as of September 30, 2021 and December 31, 2020.