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3. Revenue Recognition | 12 Months Ended
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Dec. 31, 2020
Revenue Recognition [Abstract] |
Revenue Recognition | Sales of products for the years ended December 31, 2020 and 2019, were as follows:
|  | Year Ended |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Antimony |  | $ | 2,942,628 |  |  | $ | 5,450,649 |
Zeolite |  |  | 2,118,823 |  |  |  | 2,623,117 |
Precious metals |  |  | 174,079 |  |  |  | 194,239 |
|  | $ | 5,235,530 |  |  | $ | 8,268,005 |
The following is sales information by geographic area based on the location of customers for the years ended December 31, 2020, and 2019.
|  | Year Ended |
|  | December 31, |
|  | 2020 |  |  | 2019 |
United States |  | $ | 4,662,841 |  |  | $ | 7,454,163 |
Canada |  |  | 572,689 |  |  |  | 813,842 |
Mexico |  |  | - |  |  |  | - |
|  | $ | 5,235,530 |  |  | $ | 8,268,005 |
Sales of products to significant customers were as follows for the years ended December 31, 2020, and 2019:
|  | For the Year Ended |
Sales to Three |  | December 31, |  |  | December 31, |
Largest Customers |  | 2020 |  |  | 2019 |
Mexichem Specialty Compounds Inc. |  | $ | 633,846 |  |  | $ | 1,823,194 |
GE Chaplin, Inc. |  |  | 589,384 |  |  |  | - |
Nyacol Nanotechnologies |  |  | 417,501 |  |  |  | 1,099,504 |
Kohler |  |  | 345,899 |  |  |  | 1,132,674 |
|  | $ | 1,986,630 |  |  | $ | 4,055,372 |
% of Total Revenues |  |  | 38 | % |  |  | 49 | %
Accounts receivable from the Company’s largest customers were as follows for December 31, 2020, and 2019:
|  | December 31, |  |  | December 31, |
Largest Accounts Receivable |  | 2020 |  |  | 2019 |
Nutreco Canada Inc. |  | $ | 21,619 |  |  | $ | 21,219 |
Earth Innovations Inc. |  |  | 68,055 |  |  |  | 15,184 |
Ralco Mix |  |  | 16,600 |  |  |  | 12,800 |
Premier Tech |  |  | 12,255 |  |  |  | - |
Lake Shore |  |  | - |  |  |  | 27,854 |
Total |  | $ | 118,529 |  |  | $ | 77,057 |
% of Total Receivables |  |  | 50 | % |  |  | 27 | %
The Company’s trade accounts receivable balance related to contracts with customers was $238,634 at December 31, 2020 and $284,453 at December 31, 2019.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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