5. Inventories (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventories	$ 755,261	$ 914,709
Antimony Metal [Member]
Inventories	8,127	0
Antimony Oxide [Member]
Inventories	255,782	408,217
Antimony Concentrates
Inventories	2,214		$ 35,554
Antimony Ore [Member]
Inventories	257,067	187,133
Antimony [Member]
Inventories	523,190	630,904
Zeolite (Member)
Inventories	$ 232,071	$ 283,805