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3. Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
    March 31,     December 31,  
    2017     2016  
Antimony Metal   $ 235,741     $ 112,300  
Antimony Oxide     252,553       326,126  
Antimony Concentrates     28,317       30,815  
Antimony Ore     172,347       181,815  
     Total antimony     688,958       651,056  
Zeolite     222,065       204,581  
    $ 911,023     $ 855,637