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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.

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