4. Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

	Three Months Ended
	March 31,
	2021		2020
Antimony	$	657,107	$	1,121,425
Zeolite		519,947		559,360
Precious metals		76,233		62,206
	$	1,253,287	$	1,742,991

Revenue by geographic area

	Three Months Ended
	March 31,
	2021		2020
United States	$	1,165,513	$	1,566,237
Canada		87,774		176,754
	$	1,253,287	$	1,742,991

Sales of products to significant customers

Sales to Three	For the Period Ended
Largest Customers	March 31, 2021			March 31, 2020
Zeo Inc.	$	152,317		$	-
GE Chaplin, Inc.		298,150			114,291
Nyacol Technologies		-			106,161
Mexichem Speciality Compounds		327,670			413,993
	$	778,137		$	634,445
% of Total Revenues		62.09	%		36.40	%

Accounts receivable from largest customers

Largest
Accounts Receivable	March 31, 2021			December 31, 2020
Mexichem Speciality Compounds	$	185,804		$	-
GE Chaplin, Inc.		102,408			-
Earth Innovations Inc.		-			68,055
	$	288,212		$	68,055
% of Total Receivables		53.61	%		28.52	%