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5. Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
    March 31,     December 31,  
    2018     2017  
Antimony Metal   $ 3,580     $ -  
Antimony Oxide     215,778       408,217  
Antimony Concentrates     11,545       35,554  
Antimony Ore     151,841       187,133  
     Total antimony     382,744       630,904  
Zeolite     258,350       283,805  
    $ 641,094     $ 914,709