5. Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories at March 31, 2018 and December 31, 2017 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, 2018 and December 31, 2017, is as follows:

	March 31,		December 31,
	2018		2017
Antimony Metal	$	3,580	$	-
Antimony Oxide		215,778		408,217
Antimony Concentrates		11,545		35,554
Antimony Ore		151,841		187,133
Total antimony		382,744		630,904
Zeolite		258,350		283,805
	$	641,094	$	914,709