Rich Hill Mine group, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA
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Wilson, E.D., et al (1950), Arizona zinc & lead deposits, Part I, Arizona Bureau of Mines Bull. 156: 48-49.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 137 (Table 4).
USGS Twin Buttes Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10161767, MAS ID #0040190372.
A former underground Cu-Ag-Pb-Zn-Au mine located in the center of sec. 10, T.17S., R.12E., on land of unknown status. Owned at times, or in part, by the Swastika Mines Co.; Swastika Copper & Silver Mining Co.; and the Rich Hill Mining Co.
Mineralization is sulfides and sulfosalts, partly oxidized, in irregular, lensing, vein-like, quartz orebodies along fissure zones and at fissure intersections in altered and locally brecciated Cretaceous sediments and volcanics within the San Xavier thrust-fault block.
Workings include shallow shaft operations. Some 4,000 tons of ore, averaging about 4% Cu, 6 oz. Ag/T, 2.5% Pb and minor Au, were produced intermittently from the early 1900's to 1925.
5 entries listed. 4 valid minerals.
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