6. Properties, Plants and Equipment (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Plant and equipment	$ 14,583,260	$ 14,490,665
Buildings	1,271,439	1,560,697
Mineral rights and interests	832,187	820,450
Land & other	5,767,926	5,819,176
Total	22,454,812	22,690,988
Accumulated depreciation	(11,229,218)	(10,504,140)
Properties, plants and equipment, net	11,225,594	12,186,848
USAC
Plant and equipment	815,737	783,290
Buildings	247,210	247,210
Mineral rights and interests	0	0
Land & other	3,274,572	3,274,572
Total	4,337,519	4,305,072
Accumulated depreciation	(2,699,781)	(2,673,972)
Properties, plants and equipment, net	1,637,738	1,631,100
USAMSA
Plant and equipment	8,757,775	9,164,600
Buildings	613,449	902,707
Mineral rights and interests	828,523	816,786
Land & other	2,478,044	2,529,294
Total	12,677,791	13,413,387
Accumulated depreciation	(5,042,381)	(4,612,567)
Properties, plants and equipment, net	7,635,410	8,800,820
BRZ
Plant and equipment	3,743,051	3,729,061
Buildings	410,780	410,780
Mineral rights and interests	3,664	3,664
Land & other	15,310	15,310
Total	4,172,805	4,158,815
Accumulated depreciation	(3,154,244)	(2,971,625)
Properties, plants and equipment, net	1,018,561	1,187,190
Precious Metals
Plant and equipment	1,266,697	813,714
Buildings	0	0
Mineral rights and interests	0	0
Land & other	0	0
Total	1,266,697	813,714
Accumulated depreciation	(332,812)	(245,976)
Properties, plants and equipment, net	933,885	567,738
United States
Properties, plants and equipment, net	2,787,181	2,961,895
Mexico
Properties, plants and equipment, net	$ 8,438,413	$ 9,224,953

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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