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5. Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
    September 30,     December 31,  
    2018     2017  
Antimony oxide   $ 304,165     $ 408,217  
Antimony with precious metal content     -       35,554  
Antimony ore     156,997       187,133  
     Total antimony     461,162       630,904  
Zeolite     255,734       283,805  
    $ 716,896     $ 914,709