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6. Properties, Plants and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Properties, Plants and Equipment | The major components of the Company's properties, plants and equipment by segment at December 31, 2020 and 2019 are shown below:
|  | Antimony Segment |  |  | Zeolite Segment |  |  | Precious Metals |  |  |  |
2020 |  | USAC |  |  | USAMSA |  |  | BRZ |  |  | Segment |  |  | TOTAL |
Plant and equipment |  | $ | 815,737 |  |  | $ | 8,757,775 |  |  | $ | 3,743,051 |  |  | $ | 1,266,697 |  |  | $ | 14,583,260 |
Buildings |  |  | 247,210 |  |  |  | 613,449 |  |  |  | 410,780 |  |  |  | - |  |  |  | 1,271,439 |
Mineral rights and interests |  |  | - |  |  |  | 828,523 |  |  |  | 3,664 |  |  |  | - |  |  |  | 832,187 |
Land and other |  |  | 3,274,572 |  |  |  | 2,478,044 |  |  |  | 15,310 |  |  |  | - |  |  |  | 5,767,926 |
|  |  | 4,337,519 |  |  |  | 12,677,791 |  |  |  | 4,172,805 |  |  |  | 1,266,697 |  |  |  | 22,454,812 |
Accumulated depreciation |  |  | (2,699,781 | ) |  |  | (5,042,381 | ) |  |  | (3,154,244 | ) |  |  | (332,812 | ) |  |  | (11,229,218 | )
|  | $ | 1,637,738 |  |  | $ | 7,635,410 |  |  | $ | 1,018,561 |  |  | $ | 933,885 |  |  | $ | 11,225,594 |
|  | Antimony Segment |  |  | Zeolite Segment |  |  | Precious Metals |  |  |  |
2019 |  | USAC |  |  | USAMSA |  |  | BRZ |  |  | Segment |  |  | TOTAL |
Plant and equipment |  | $ | 783,290 |  |  | $ | 9,164,600 |  |  | $ | 3,729,061 |  |  | $ | 813,714 |  |  | $ | 14,490,665 |
Buildings |  |  | 247,210 |  |  |  | 902,707 |  |  |  | 410,780 |  |  |  | - |  |  |  | 1,560,697 |
Mineral rights and interests |  |  | - |  |  |  | 816,786 |  |  |  | 3,664 |  |  |  | - |  |  |  | 820,450 |
Land and other |  |  | 3,274,572 |  |  |  | 2,529,294 |  |  |  | 15,310 |  |  |  | - |  |  |  | 5,819,176 |
|  |  | 4,305,072 |  |  |  | 13,413,387 |  |  |  | 4,158,815 |  |  |  | 813,714 |  |  |  | 22,690,988 |
Accumulated depreciation |  |  | (2,673,972 | ) |  |  | (4,612,567 | ) |  |  | (2,971,625 | ) |  |  | (245,976 | ) |  |  | (10,504,140 | )
|  | $ | 1,631,100 |  |  | $ | 8,800,820 |  |  | $ | 1,187,190 |  |  | $ | 567,738 |  |  | $ | 12,186,848 |
United States and Mexico components of properties, plants and equipment:
|  | 2020 |  |  | 2019 |
United States |  | $ | 2,787,181 |  |  | $ | 2,961,895 |
Mexico |  |  | 8,438,413 |  |  |  | 9,224,953 |
Total |  | $ | 11,225,594 |  |  | $ | 12,186,848 |
The Company’s precious metals segment includes properties, plants and equipment in both the United States and Mexico. In the third quarter of 2020, the Company decided not to renew the lease at the Wadley Mining district in Mexico due to continuing low market price for antimony and to reduce Mexican antimony production while seeking other lower cost sources of antimony ore and concentrates. The net carrying value of the mineral lease of $318,502 was recognized as a loss on mineral properties during the year ended December 31, 2020. In the fourth quarter of 2019, the Company abandoned the Soyatal and Guadalupe mineral properties in Mexico. The net carrying value of the mineral properties of $2,937,259 less the outstanding related notes payable balances, resulted in a loss on mineral properties of $1,410,736 which was recognized during the year ended December 31, 2019. At December 31, 2020 and 2019, the Company had $755,978 and $1,306,579, respectively, of assets that were not yet placed in service and have not yet been depreciated.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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