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5. Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | The major components of the Company's inventories at December 31, 2020 and 2019 were as follows:
|  | 2020 |  |  | 2019 |
Antimony Oxide |  | $ | 67,377 |  |  | $ | 204,550 |
Antimony Metal |  |  | 268,100 |  |  |  | 5,654 |
Antimony Ore |  |  | 95,880 |  |  |  | 151,841 |
Total antimony |  |  | 431,357 |  |  |  | 362,045 |
Zeolite |  |  | 218,856 |  |  |  | 264,199 |
|  | $ | 650,213 |  |  | $ | 626,244 |
At December 31, 2020 and 2019, antimony metal consisted principally of recast metal from antimony-based compounds, and metal purchased from foreign suppliers. Antimony oxide inventory consisted of finished product oxide held at the Company's plant. Antimony concentrates and ore were held primarily at sites in Mexico and are essentially raw material. At December 31, 2020 and 2019, the antimony oxide and concentrates inventory in Mexico were valued at estimated net realizable value resulting in write-downs of $13,137 and $16,396, respectively. The Company's zeolite inventory consists of salable zeolite material.

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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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