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5. Inventories (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Inventories $ 565,050 $ 626,244
Antimony Oxide    
Inventories 47,981 204,550
Antimony Metal    
Inventories 28,807 5,654
Antimony Ore    
Inventories 151,841 151,841
Antimony    
Inventories 228,629 362,045
Zeolite    
Inventories $ 336,421 $ 264,199