5. Inventories (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Inventories	$ 712,696	$ 914,709
Antimony Oxide - Finished
Inventories	225,099	408,217
Antimony Concentrates
Inventories	56,091	0
Antimony Metal [Member]
Inventories	23,474	35,554
Antimony Ore [Member]
Inventories	165,280	187,133
Antimony [Member]
Inventories	469,944	630,904
Zeolite [Member]
Inventories	$ 242,752	$ 283,805