Latitude: 31°51'45"N
Longitude: 111°6'20"W
Ref.: Cooper, J.R. (1960) Some geologic features of the Pima mining district, Pima County, Arizona: U.S. Geological Survey Bulletin 1112-C, p. 63-103, 1 sheet, scale 1:31,680.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 134 (Table 4).
Copper Handbook (1908, 1912-1913, 1920).
USGS Twin Buttes Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10026759, MRDS ID #M000103; and, Dep. ID #10113154, MAS ID #0040190186.
A former small surface and underground Pb-Cu-Ag-Zn-Au-Mo mine group located in South-central sec. 16, North central sec. 21, and West-central sec. 15, 16, & 21, T.18S., R.12E, 4 miles SW of Twin Buttes on private land. Owned at times, or in part, by the Chesterfield Copper Co.; Blanche Rose Mining Co.; and the Magnate Copper Co. Originally prospected in Spanish colonial times.
Mineralization is spotty base metal sulfides, partly oxidized, in irregular quartz veins along faults and fractures in Cretaceous sedimentary-volcanic formations intruded by Laramide quartz monzonite porphyry and andesite dikes and plugs. Alteration included partly oxidized, locally kaolinized and sericitized, slightly silicified areas. The Cretaceous rocks are Arkose, quartzite, conglomerate, shale, rhyolite, and graywacke.
Workings include numerous small shafts and pits. Worked intermittently from the early 1900's to about 1917. Produced some 360 tons of ore averaging about 7% Pb, 4% Cu, 13 oz. Ag/T and minor Au.
Mineral List
7 entries listed. 6 valid minerals.
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