5. Inventories

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Inventories

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

	September 30, 2020		December 31, 2019
Antimony Oxide	$	47,981	$	204,550
Antimony Metal		28,807		5,654
Antimony Ore		151,841		151,841
Total antimony		228,629		362,045
Zeolite		336,421		264,199
	$	565,050	$	626,244

Antimony oxide inventory consisted of finished product oxide held at the Company's plants in Montana and Mexico. 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 September 30, 2020 and December 31, 2019, the antimony inventory in Mexico was valued at estimated net realizable value resulting in write-downs of $7,502 and $16,396, respectively.