4. Revenue Recognition (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 1,742,991	$ 2,456,365
Antimony
Revenues	1,121,425	1,705,823
Zeolite
Revenues	559,360	726,015
Precious Metals
Revenues	62,206	24,527
United States
Revenues	1,566,237	2,244,400
Canada
Revenues	$ 176,754	$ 211,965

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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+ Details