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16. Business Segments (Details 1) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Capital Expenditures | $ 405,819 | $ 665,370
United States Antimony [Member] |  |
Capital Expenditures | 32,961 | 1,331
Mexico Antimony [Member] |  |
Capital Expenditures | 87,396 | 226,331
Subtotal Antimony [Member] |  |
Capital Expenditures | 120,357 | 227,662
Precious Metals [Member] |  |
Capital Expenditures | 185,668 | 304,412
Zeolite (Member) |  |
Capital Expenditures | $ 99,794 | $ 133,296

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- Details
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