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5. Inventories

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories at June 30, 2020 and December 31, 2019 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. Inventories at June 30, 2020 and December 31, 2019, are as follows:

		June 30, 2020				December 31, 2019
Antimony Oxide		$	122,783			$	204,550
Antimony Metal			25,776				5,654
Antimony Ore			151,841				151,841
Total antimony			300,400				362,045
Zeolite			285,954				264,199
		$	586,354			$	626,244

Antimony oxide inventory consisted of finished product oxide held at the Company's plant in Montana. Antimony concentrates and ore were held primarily at sites in Mexico and are essentially raw material. The Company's zeolite inventory consists of salable zeolite material.

At June 30, 2020 and December 31, 2019, the antimony inventory in Mexico was valued at estimated net realizable value resulting in write-downs of $16,380 and $16,396, respectively.