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5. Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
   

March 31,

2021

   

December 31,

2020

 
Antimony Metal   $ 25,238     $ 268,100  
Antimony Oxide     360,566       67,377  
Antimony Ore     167,945       95,880  
     Total antimony     553,749       431,357  
Zeolite     164,001       218,856  
    $ 717,750     $ 650,213