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16. Business Segments (Details 1) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Capital expenditures | $ 243,091 | $ 792,925
United States Antimony |  |
Capital expenditures | 32,448 | 8,429
Mexico Antimony |  |
Capital expenditures | 38,456 | 705,123
Subtotal Antimony |  |
Capital expenditures | 70,904 | 713,552
United States Precious metals |  |
Capital expenditures | 10,219 | 21,086
Mexico Precious metals |  |
Capital expenditures | 147,978 | 0
Precious Metals |  |
Capital expenditures | 158,197 | 21,086
Zeolite |  |
Capital expenditures | $ 13,990 | $ 58,287

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