6. Properties, Plants and Equipment (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Plant and equipment	$ 14,490,665	$ 13,693,105
Buildings	1,560,697	1,539,507
Mineral rights and interests	820,450	3,797,166
Land & other	5,819,176	5,819,176
Total	22,690,988	24,848,954
Accumulated depreciation	(10,504,140)	(9,621,782)
Properties, plants and equipment, net	12,186,848	15,227,172
USAC
Plant and equipment	783,290	743,767
Buildings	247,210	247,210
Mineral rights and interests	0	0
Land & other	3,274,572	3,274,572
Total	4,305,072	4,265,549
Accumulated depreciation	(2,673,972)	(2,630,234)
Properties, plants and equipment, net	1,631,100	1,635,315
USAMSA
Plant and equipment	9,164,600	8,466,461
Buildings	902,707	900,992
Mineral rights and interests	816,786	3,793,502
Land & other	2,529,294	2,529,294
Total	13,413,387	15,690,249
Accumulated depreciation	(4,612,567)	(4,029,480)
Properties, plants and equipment, net	8,800,820	11,660,769
BRZ
Plant and equipment	3,729,061	3,690,249
Buildings	410,780	391,305
Mineral rights and interests	3,664	3,664
Land & other	15,310	15,310
Total	4,158,815	4,100,528
Accumulated depreciation	(2,971,625)	(2,785,159)
Properties, plants and equipment, net	1,187,190	1,315,369
Precious Metals
Plant and equipment	813,714	792,628
Buildings	0	0
Mineral rights and interests	0	0
Land & other	0	0
Total	813,714	792,628
Accumulated depreciation	(245,976)	(176,909)
Properties, plants and equipment, net	$ 567,738	$ 615,719