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16. Business Segments (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Total Assets | $ 17,131,254 | $ 17,765,998
United States Antimony [Member] |  |
Total Assets | 2,510,323 | 2,514,306
Mexico Antimony [Member] |  |
Total Assets | 12,073,219 | 12,682,908
Subtotal Antimony [Member] |  |
Total Assets | 14,583,542 | 15,197,214
Precious Metals [Member] |  |
Total Assets | 642,774 | 524,352
Zeolite (Member) |  |
Total Assets | $ 1,904,938 | $ 2,044,432

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