‡Ref.: Ransome, F.L. (1922), Ore deposits of the Sierrita Mountains, Pima County, Arizona, USGS Bull. 725-J: 407-428.
Higdon, C.E. (1933) Geology and ore deposits of the Sunshine area, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 25 p.
Elsing, M.J. and Heineman, E.S. (1936) Arizona Metal Production, Arizona Bureau of Mines Bulletin 140.
Wilson, E.D., Moore, R.T., and O'Haire, R.T. (1960) Geologic map of Pima and Santa Cruz Counties, Arizona: Arizona Bureau of Mines, 1 sheet, scale 1:375,000 [now available as Arizona Geological Survey Map M-3-8].
Arizona Department of Mineral Resources (1967) file data.
Krieger, M.H. (1973) Field Examination.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 169.
USGS Palo Alto Ranch Quadrangle topo map.
MRDS database Dep. ID file #10039560, MRDS ID #M050282; and, Dep. D #10234471, MAS ID #0040190421; and, Dep. ID #10234947, MAS ID #0040190669.
A former small surface and underground Pb-Cu-Ag-Au-Zn-Baryte mine located in the SE¼ sec. 12, T18s, R10E. Produced 1880-1959. Operators included Arizona Lead Mines Co., Dry Concentrates, Ramsdell Mines Co., and the Shafer Mining and Milling Co.
Mineralization is a tabular ore body in a permiable shear zone with fractured limestone that facilitated or controlled replacement. Ore occurs on both walls of the fault where limestone is highly fractured. Limestone is veined with quartz-pyrite-galena-sphalerite, a little Cu staining, and a yellow Pb mineral. The ore body is 15.24 meters thick, strikes N20W and dips 24W.An associated rock unit is a granite. Alteration included quartz-sericite-pyrite; pyrite-gossan.
Workings included the main shaft with short drifts & crosscuts; open cut with a stope. Workings are 42.67 meters deep.
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