13. Business Segments (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Properties, plants and equipment, net	$ 11,026,428	$ 11,225,594
United States Antimony
Properties, plants and equipment, net	1,629,846	1,637,738
Mexico Antimony
Properties, plants and equipment, net	7,495,331	7,635,410
Subtotal Antimony
Properties, plants and equipment, net	9,125,177	9,273,148
Precious Metals
Properties, plants and equipment, net	924,707	933,885
Zeolite
Properties, plants and equipment, net	$ 976,544	$ 1,018,561

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(8))
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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