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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2022
Inventories |
Summary of Inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
​ | ​ | (in thousands)
Stockpiles - underground mine | ​ | $ | 597 | ​ | $ | -
Concentrates | ​ | ​ | 3,271 | ​ | ​ | 2,048
Doré, net | ​ | ​ | 653 | ​ | ​ | 452
Subtotal - product inventories | ​ | ​ | 4,521 | ​ | ​ | 2,500
Materials and supplies (1) | ​ | ​ | 8,979 | ​ | ​ | 7,861
Total | ​ | $ | 13,500 | ​ | $ | 10,361
| (1) | Net of reserve for obsolescence of $0.1 million and $0.4 million as of December 31, 2022 and 2021, respectively.

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