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5. Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
    March 31,     December 31,  
    2019     2018  
Antimony Metal   $ 158,532     $ 8,127  
Antimony Oxide     252,704       255,782  
Antimony Concentrates     -       2,214  
Antimony Ore     269,627       257,067  
     Total antimony     680,863       523,190  
Zeolite     206,785       232,071  
    $ 887,648     $ 755,261