Elgin Mine, Elgin Mine group, Peach-Elgin copper deposit, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92.

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: 125.

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.

MRDS database Dep. ID file #10103733, MRDS ID #M050039.

A former small surface and underground Cu-Zn-Ag-Pb-Au-Mo mine. Operated 1901-1960.

Mineralization is a skarn deposit with ore in irregular lenses hosted in the Concha Limestone and the Horquilla Limestone. Ore control was faults, fractures, and favorable silicated limestone. Ore concentration was permeable fracture zones. Alteration includes silicification.

Local structures include thrust and noraml faulting - fracture zones; homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.

Mineral List

Bornite Chalcocite Chalcopyrite

Chrysocolla Cuprite Diopside

'Garnet' Magnetite Malachite

Molybdenite Pyrite

11 entries listed. 10 valid minerals.