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5. Inventories (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventories | $ 650,213 | $ 626,244
Antimony Oxide |  |
Inventories | 67,377 | 204,550
Antimony Metal |  |
Inventories | 268,100 | 5,654
Antimony Ore |  |
Inventories | 95,880 | 151,841
Antimony |  |
Inventories | 431,357 | 362,045
Zeolite |  |
Inventories | $ 218,856 | $ 264,199

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