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3. Inventories
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories

Inventories at September 30, 2016 and December 31, 2015, consisted primarily of finished antimony products, antimony metal, antimony ore, and finished zeolite products that are stated at the lower of first-in, first-out cost or estimated net realizable value. Finished antimony products, antimony metal and finished zeolite products costs include raw materials, direct labor and processing facility overhead costs and freight. Inventory at September 30, 2016 and December 31, 2015, is as follows:

 

   

September 30,

2016

    

December 31,

2015

  
Antimony Metal   $ 60,491     $ 102,207  
Antimony Oxide     253,110       332,068  
Antimony Concentrates     48,785       133,954  
Antimony Ore     151,841       319,631  
     Total antimony     514,227       887,860  
Zeolite     223,891       206,378  
    $ 738,118     $ 1,094,238  
                 

 

During the first quarter of 2015 the Company discovered it had been overcharged for raw material purchases from a vendor.  The Company brought the matter to the vendor’s attention and received a $914,967 credit to accounts payable due the vendor that was recorded as a gain on liability adjustment during the nine months ended September 30, 2015.