5. Inventories (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventories	$ 914,709	$ 855,637
Antimony Metal [Member]
Inventories	0	112,300
Antimony Oxide [Member]
Inventories	408,217	326,126
Antimony Concentrates
Inventories	35,554		$ 30,815
Antimony Ore [Member]
Inventories	187,133	181,815
Antimony [Member]
Inventories	630,904	651,056
Zeolite (Member)
Inventories	$ 283,805	$ 204,581