Geneva Mine (Geneva claim), Miami, Miami-Inspiration District, Globe-Miami District, Gila Co., Arizona, USA
A former surface and underground Cu-Mn mine located in the center W½W½ sec. 19, T1N, R15E, adjoining the property of the Warrior Copper Co. on the east, about 1¼ miles N of Miami, about 1¾ miles WNW of Claypool, on patented/mixed land. It is about 2,000 feet east of the Black Warrior Mine, near the intersection of the Warrior fault zone with the Miami fault. Owned by the Old Dominion Copper Mining and Smelting Co. and worked by lessees about 1900.
Mineralization is an orebody formed through the replacement of dacite tuff. The deposit is along a complex system of faults, generally referred to as the Warrior fault zone. It is in a narrow graben of interbedded tuff and conglomerate in the Warrior fault zone. The tuffaceous conglomarate is about 50 feet thick (Ransome, 1903: 158-159). The orebody is nearly horizontal, 4 feet in maximum thickness, and 15 feet wide, lying near the base of the tuff. It rarely possessed definite boundaries but graded into low-grade ore, and this into argillized tuff faintly tinged green by copper. The ore was like that of the Black Copper and Black Warrior deposits.
ReferencesRansome, F.L. (1903) Geology of the Globe Copper District, Arizona, USGS PP 12: 158.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 29.
Wells, R.C. (1937) Analyses of rocks and minerals from the laboratory of the United States Geological Survey, 1914-36: U.S. Geological Survey Bulletin 878, 134 p.
Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami District, Arizona, USGS PP 342: 80, 135, 137.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 172.
U.S. Bureau of Land Management Mining District Sheet 155.
MRDS database Dep. ID #10161246, MAS ID #0040070333.
1 entry listed. 1 valid mineral.
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Locality Updated: Água Retorta, Povoação, San Miguel Island, Azores District, PortugalFrom Rui Nunes, 7th Dec 2013 11:29:40