13. Business Segments (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Properties, plants and equipment, net	$ 15,254,204	$ 15,227,172
Total assets	17,119,227	17,557,123
United States Antimony
Properties, plants and equipment, net	1,616,273	1,635,315
Total assets	2,171,811	2,199,694
Mexico Antimony
Properties, plants and equipment, net	11,779,305	11,660,769
Total assets	12,453,537	12,824,292
Subtotal Antimony
Properties, plants and equipment, net	13,395,577	13,296,084
Total assets	14,625,348	15,023,986
Precious Metals
Properties, plants and equipment, net	594,850	615,719
Total assets	594,850	615,719
Zeolite
Properties, plants and equipment, net	1,263,777	1,315,369
Total assets	$ 1,899,029	$ 1,917,418