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5. Inventories (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Inventories $ 708,074 $ 755,261
Antimony Oxide    
Inventories 147,304 255,782
Antimony Metal    
Inventories 37,346 8,127
Sodium Antimonate    
Inventories 28,568 0
Antimony Concentrates    
Inventories 0 2,214
Antimony Ore    
Inventories 198,492 257,067
Antimony    
Inventories 411,710 523,190
Zeolite    
Inventories $ 296,364 $ 232,071