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5. Inventories (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Inventories | $ 755,261 | $ 914,709 |
Antimony Metal [Member] |  |  |
Inventories | 8,127 | 0 |
Antimony Oxide [Member] |  |  |
Inventories | 255,782 | 408,217 |
Antimony Concentrates |  |  |
Inventories | 2,214 |  | $ 35,554
Antimony Ore [Member] |  |  |
Inventories | 257,067 | 187,133 |
Antimony [Member] |  |  |
Inventories | 523,190 | 630,904 |
Zeolite (Member) |  |  |
Inventories | $ 232,071 | $ 283,805 |

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