5. Inventories (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Inventories	$ 717,750	$ 650,213
Antimony Metal
Inventories	25,238	268,100
Antimony Oxide
Inventories	360,566	67,377
Antimony Ore
Inventories	167,945	95,880
Antimony
Inventories	553,749	431,357
Zeolite
Inventories	$ 164,001	$ 218,856