5. Inventories (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Inventories	$ 642,893	$ 626,244
Antimony Oxide
Inventories	200,780	204,550
Antimony Concentrates
Inventories	0	5,654
Antimony Ore
Inventories	151,841	151,841
Antimony
Inventories	352,621	362,045
Zeolite
Inventories	$ 290,272	$ 264,199