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Buckhorn Mine (Wisconsin Mine), Greaterville, Greaterville 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: 153, 157.

Wilson, E.D. (1927), Arizona Gold Placers and Placering, 2nd. ed. revised, University of Arizona Bull. 124: 36.

Drewes, Harald (1970) Structural control of geochemical anomalies in the Greaterville mining district, southeast of Tucson: U.S. Geological Survey Bulletin 1312-A, p. A1-A49, 1 sheet, scale 1:24,000.

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: 120 (Table 4).

USGS Sahuarita Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039502, MRDS ID #M050176; and, Dep. ID #10210929, MAS ID #0040190139.

A former small underground Ag-Cu-Pb-Au mine located in East-central sec. 14, T.19S., R.15E., 1.2 miles NW of Greaterville, and 37 miles SE of Tucson. Produced 1880-1937. Owned by Pallanes. Operated by J.B. Daugherty.

Mineralization is a tabular ore body with partially oxidized sulfides with free gold in an oxidized zone in an iron-stained quartz vein cutting Precambrian granodiorite near overlying siliceous shale and dolomitic beds on the east. The vein is 0.3 meters wide, strikes NW-SE and dips 45ºSW. An associated rock unit is Precambrian granodiorite at 1450 ± 10 MY.

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

Workings include several shallow shafts, an incline and a tunnel. Worked in the late 1880's and 1936-1937, producing a small tonnage of Au, Ag, Pb & Cu ore.

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4 entries listed. 4 valid minerals.

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