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6. Properties, Plants and Equipment (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Equipment $ 11,717,968 $ 10,139,948
Buildings 1,498,148 1,427,463
Mineral Rights 3,743,352 1,117,636
Land & Other 5,819,176 6,642,280
Total 22,778,644 19,327,327
Accumulated Depreciation (6,748,311) (5,815,524)
Properties, plants and equipment, net 16,030,333 13,511,803
USAC    
Equipment 872,548 814,183
Buildings 247,210 243,248
Mineral Rights 0 0
Land & Other 3,274,572 3,274,572
Total 4,394,330 4,332,003
Accumulated Depreciation (2,456,928) (2,395,109)
Properties, plants and equipment, net 1,937,402 1,936,894
MEXICO    
Equipment 7,497,791 6,159,064
Buildings 900,992 834,269
Mineral Rights 3,743,352 1,117,636
Land & Other 2,529,294 3,367,708
Total 14,671,429 11,478,677
Accumulated Depreciation (2,131,624) (1,482,098)
Properties, plants and equipment, net 12,539,805 9,996,579
BRZ    
Equipment 3,347,629 3,166,701
Buildings 349,946 349,946
Mineral Rights 0 0
Land & Other 15,310 0
Total 3,712,885 3,516,647
Accumulated Depreciation (2,159,759) (1,938,317)
Properties, plants and equipment, net $ 1,553,126 $ 1,578,330