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5. Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | The major components of the Company's inventories at December 31, 2017 and 2016 were as follows:
|  | 2017 |  |  | 2016 |
Antimony Metal |  | $ | - |  |  | $ | 112,300 |
Antimony Oxide |  |  | 408,217 |  |  |  | 326,126 |
Antimony Concentrates |  |  | 35,554 |  |  |  | 30,815 |
Antimony Ore |  |  | 187,133 |  |  |  | 181,815 |
Total antimony |  |  | 630,904 |  |  |  | 651,056 |
Zeolite |  |  | 283,805 |  |  |  | 204,581 |
|  | $ | 914,709 |  |  | $ | 855,637 |
At December 31, 2017 and 2016, antimony metal consisted principally of recast metal from antimony-based compounds, and metal purchased from foreign suppliers. Antimony oxide inventory consisted of finished product oxide held at the Company's plant. Antimony concentrates and ore were held primarily at sites in Mexico and are essentially raw material, carried at cost. At December 31, 2017 and 2016, the antimony inventory in Mexico was valued at net realizable value. The Company's zeolite inventory consists of salable zeolite material held at BRZ's Idaho mining and production facility, and is carried at cost.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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