| Summary of Inventories |
| | | | | | | | | As of | | As of | | | December 31, | | December 31, | | | 2021 | | 2020 | | | | (in thousands) | Stockpiles - underground mine | | $ | - | | $ | 648 | Stockpiles - open pit mine | | | - | | | 41 | Concentrates | | | 2,048 | | | 1,919 | Doré, net (1) | | | 452 | | | 459 | Subtotal - product inventories | | | 2,500 | | | 3,067 | Materials and supplies (2) | | | 7,861 | | | 6,928 | Total | | $ | 10,361 | | $ | 9,995 |
| (1) | Net of reserve of nil and $368 as of December 31, 2021 and 2020, respectively. |
| (2) | Net of reserve for obsolescence of $384 and $209 as of December 31, 2021 and 2020, respectively. |
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