5. Inventories

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories at September 30, 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 September 30, 2018 and December 31, 2017 is as follows:

	September 30,		December 31,
	2018		2017
Antimony oxide	$	304,165	$	408,217
Antimony with precious metal content		-		35,554
Antimony ore		156,997		187,133
Total antimony		461,162		630,904
Zeolite		255,734		283,805
	$	716,896	$	914,709