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5. Inventories | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | The major components of the Company's inventories at December 31, 2018 and 2017 were as follows:
|  | 2018 |  |  | 2017 |
Antimony Metal |  | $ | 8,127 |  |  | $ | - |
Antimony Oxide |  |  | 255,782 |  |  |  | 408,217 |
Antimony Concentrates |  |  | 2,214 |  |  |  | 35,554 |
Antimony Ore |  |  | 257,067 |  |  |  | 187,133 |
Total antimony |  |  | 523,190 |  |  |  | 630,904 |
Zeolite |  |  | 232,071 |  |  |  | 283,805 |
|  | $ | 755,261 |  |  | $ | 914,709 |
At December 31, 2018 and 2017, 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. At December 31, 2018 and 2017, the antimony oxide and concentrates inventory in Mexico was valued at estimated net realizable value. The Company's zeolite inventory consists of salable zeolite material held in a Canadian warehouse and 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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