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Inventories, net | 9 Months Ended
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Sep. 30, 2021
Inventories, net |
Inventories, net | ​ 6. Inventories, net ​ At September 30, 2021 and December 31, 2020, inventories, net, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | (Unaudited) | ​ | ​ | ​
​ | ​ | (in thousands)
Stockpiles - underground mine | ​ | $ | 796 | ​ | $ | 648
Stockpiles - open pit mine | ​ | ​ | - | ​ | ​ | 41
Concentrates | ​ | ​ | 1,745 | ​ | ​ | 1,919
Doré, net (1) | ​ | ​ | 602 | ​ | ​ | 459
Subtotal - product inventories | ​ | ​ | 3,143 | ​ | ​ | 3,067
Materials and supplies (2) | ​ | ​ | 7,733 | ​ | ​ | 6,928
Total | ​ | $ | 10,876 | ​ | $ | 9,995
(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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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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