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5. Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
    June 30,     December 31,  
    2018     2017  
Sodium antimonate   $ 56,091     $ -  
Antimony oxide     225,099       408,217  
Antimony with precious metal content     23,474       35,554  
Antimony ore     165,280       187,133  
     Total antimony     469,944       630,904  
Zeolite     242,752       283,805  
    $ 712,696     $ 914,709