‡Ref.: Ransome, F.L. (1922) Ore deposits of the Sierrita Mountains, Pima County, Arizona, in Contributions to Economic Geology (Short Papers and Preliminary Reports), 1921 - Part I.--Metals and Nonmetals except Fuels: U.S. Geological Survey Bulletin 725: 415-416.
Wilson, E.D., Moore, R.T., and O'Haire, R.T. (1960) Geologic map of Pima and Santa Cruz Counties, Arizona: Arizona Bureau of Mines, 1 sheet, scale 1:375,000 [now available as Arizona Geological Survey Map M-3-8].
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 132 (Table 4).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 126, 146, 278.
USGS Palo Alto Ranch Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039559, MRDS ID #M050281; and, Dep. ID #10283634, MAS ID #0040190113.
A former small underground Pb-Ag-Zn-Au-Cu-Mn mine group located in the SE ¼ sec. 2, T.18S., R.10E., about 38 miles SW of Tucson. Discovered 1890. Owned at times, or in part, by the Francis Hagerman Mining Co.; and the Banner-Sierrita Mining Co.
Mineralization is oxidized, narrow, stranded, and lenticular quartz-calcite veins with disseminated argentiferous galena and spotty pyrite. Other sulfides and sulfosalts occur in sheared and metamorphosed Paleozoic limestone. An associated rock unit is a granite. Alteration included silicification, quartz-sericite-pyrite.
Workings include tunnel and shaft workings. 'Chloriders' produced high-grade silver ore in the late 1800's and early 1900's. Total sporadic production would be some 700 tons averaging about 60 oz. Ag/T, 40-50% Pb, 2% Cu, and minor Au.
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