‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92, 125.
Heyman, Arthur M. (1958) Geology of the Peach-Elgin copper deposit, Helvetia district, Arizona: Tucson, University of Arizona, M.S. thesis, 66 p.
Pay Dirt (1970): August 24, 1970 (history).
Arizona Bureau of Mines Field notes (1971): 1(2).
Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1:48,000.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 128 (Table 4).
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12-13 (Table 1).
Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.
Anzalone, S.A. and Brown (1992) Geology of the Helvetia Copper Deposit, SME pre-print 92-61.
Anzalone, S.A. (1995) The Helvetia area porphyry systems, Pima County, Arizona, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Arizona Geological Society Digest 20, p. 436-441.
USGS Sahuarita Quadrangle topo map.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10088601, MRDS ID #M050164; and, Dep. ID #10137491, MAS ID #0040190357; and, Dep. ID #10186454, MRDS ID #D000804, MAS ID #0040190086.
A former small surface and underground Cu-Zn-Ag-Pb-Au-Mo mine located on a patented claim in the SE ¼ (NE¼ ?)sec. 15, T.18S., R.15E. (Sahuarita 15 minute topo map), south of the Noonday. Discovered 1870. Produced 1890-1952. Owned at times, or in part, by the Rosemont Copper Co.
Mineralization is copper carbonates, oxides, silicates, and sulfides with some spotty lead and zinc minerals in selective, pyrometasomatic replacement deposits guided by faults and favorable beds in thrust-faulted Paleozoic limestone in a thrust fault klippe and containing considerble blue, green and black copper carbonates, some chalcopyrite and chrysocolla, and much brown iron stain. Some disseminated copper mineralization occurs in shattered early Paleozoic quartzite. Ore control was faults and favorable beds. Alteration includes silication. The host rock units are the Martin Formation and the Abrigo Formation.
Workings include a 60 foot deep shaft, some drifts and open cut workings. Worked from 1882 to 1952 with intermittent production of some 13,000 tons of ore averaging about 5% Cu, 2% Zn, 0.8 oz. Ag/T and minor Pb & Au.
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Map Reference: 31°52'0"N , 110°47'42"W
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