‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 153, 154-155.
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: 121 (Table 4).
USGS Sahuarita Quadrangle topo map.
MRDS database Dep. ID file #10103744, MRDS ID #M050173; and, Dep. IF #10235060, MAS ID #0040190245.
A former small underground Pb-Zn-Ag-Cu-Au mine located in East-central sec. 14, T.19S., R.15E., 2 miles west of Greaterville, 1 mile east of the Mountain King Mine, and 37 miles SE of Tucson. Discovered and owned by W.M. Robinson in 1885.
Mineralization is an irregular, 3 foot wide quartz vein in granite that dips to the west and contains spotty, partially oxidized base metal sulfides and rich, near-surface, cerussite and chlorargyrite. The vein cuts Precambrian granodiorite. Ore concentration process was permeable fracture zones. Willow Canyon Formation (siltstone, conglomerate) is the host rock unit.
Local structures include Homoclinal; regional trends: tilting and broad open folds in the south and extensive faulting in the north. Thrust and normal faulting - fracture zones.
Workings include a 100 foot (30.48 meters) deep shaft. Worked in the late 1800's. Produced a small tonnage of high-grade Pb-Ag ore.
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Map Reference: 31°46'53"N , 110°46'27"W
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