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5. Inventories (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories $ 626,244 $ 755,261  
Antimony Metal      
Inventories 0 8,127  
Antimony Oxide      
Inventories 204,550 255,782  
Antimony Concentrates      
Inventories 5,654   $ 2,214
Antimony Ore      
Inventories 151,841 257,067  
Antimony      
Inventories 362,045 523,190  
Zeolite      
Inventories $ 264,199 $ 232,071