5. Inventories (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Inventories	$ 723,688	$ 755,261
Antimony Oxide - Finished
Inventories	252,128	255,782
Antimony Metal
Inventories	0	8,127
Antimony Concentrates
Inventories	0	2,214
Antimony Ore
Inventories	201,543	257,067
Antimony
Inventories	453,671	523,190
Zeolite
Inventories	$ 270,017	$ 232,071