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5. Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
   

June 30,

2020

   

December 31,

2019

 
Antimony Oxide   $ 122,783     $ 204,550  
Antimony Metal     25,776       5,654  
Antimony Ore     151,841       151,841  
     Total antimony     300,400       362,045  
Zeolite     285,954       264,199  
    $ 586,354     $ 626,244