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5. Inventories (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Inventories | $ 855,637 | $ 1,094,238 |
Antimony Metal [Member] |  |  |
Inventories | 112,300 | 102,207 |
Antimony Oxide [Member] |  |  |
Inventories | 326,126 | 332,068 |
Antimony Concentrates |  |  |
Inventories | 30,815 |  | $ 133,954
Antimony Ore [Member] |  |  |
Inventories | 181,815 | 319,631 |
Antimony [Member] |  |  |
Inventories | 651,056 | 887,860 |
Zeolite (Member) |  |  |
Inventories | $ 204,581 | $ 206,378 |

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