5. Inventories

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories at March 31, 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. Inventory at March 31, 2020 and December 31, 2019, is as follows:

	March 31, 2020		December 31, 2019
Antimony Oxide	$	200,780	$	204,550
Antimony Concentrates		-		5,654
Antimony Ore		151,841		151,841
Total antimony		352,621		362,045
Zeolite		290,272		264,199
	$	642,893	$	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 March 31, 2020 and December 31, 2019, the antimony inventory in Mexico was valued at estimated net realizable value resulting in write-downs of $22,475 and $16,396, respectively.