14. Business Segments (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Properties, plants and equipment, net	$ 12,056,838	$ 12,186,848
United States Antimony
Properties, plants and equipment, net	1,646,827	1,631,100
Mexico Antimony
Properties, plants and equipment, net	8,386,700	8,800,820
Subtotal Antimony
Properties, plants and equipment, net	10,033,527	10,431,920
Precious Metals
Properties, plants and equipment, net	877,446	567,738
Zeolite
Properties, plants and equipment, net	$ 1,145,865	$ 1,187,190

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
-Paragraph 1
-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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