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4. Revenue Recognition (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 1,253,287	$ 1,742,991
Antimony
Revenues	657,107	1,121,425
Zeolite
Revenues	519,947	559,360
Precious Metals
Revenues	$ 76,233	$ 62,206

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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+ Details

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