Ref.: Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 117.
Fair, C.L. (1965) Geology of the Fresnal Canyon area, Baboquivari Mountains, Pima County, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 89 p.
Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 108 (Table 4).
Nowlan, G.A., Haxel, G.B., Hanna, W.F., Pitkin, J.A., Diveley-White, D.V., McDonnell, J.R., Jr., and Lundby, W. (1989) Mineral resources of the Baboquivari Peak and Coyote Mountains Wilderness Study Areas, Pima County, Arizona, Chapter E, in Mineral resources of Wilderness Study Areas: Southwestern and south-central Arizona: U.S. Geological Survey Bulletin 1702-E, p. E1-E30.
MRDS database Dep. ID file #10103748, MRDS ID #M050260; and, Dep. ID #10258931, MAS ID #0040190125.
A former small surface and underground Mn mine located in the SE ¼ sec. 15 & the NE ¼ sec. 22, T.18S., R.7E., 3.7 miles NE of Alison Camp. Discovered and owned by Mr. William H. Coplen in 1952. Operated 1953-1955. Operated at times, or in part, by William H. Coplen; Talcott; the Black Dragon Mining Co.; and the Arizona Materials & Service Co. of Bisbee (1952-1956).
Mineralization is discontinuous small lenses, coatings, and narrow fracture-fillings of soft manganese oxides and spotty pyrolusite in a sheared and brecciated zone in Tertiary (?) rhyolite. The ore zone is 609.6 meters long and 91.44 meetrs wide. Ore control was a N-S-trending fracture zone. The host rock units include the Mulberry Wash Formation - upper volcanics; and the Pitoikam Formation - lower shale, sandstone, conglomerate, etc. Fair (1965) says that the manganese is in a breccia zone along an unconformity.
Local structures include block faulting. Regional trends include NW faults, NE fracture zone.
Workings include open cuts and pits with an overall length of 36.58 meters and 3.05 meters wide. Some 165 long tons of sorted manganese ore and 19 tons of manganese concentrates were produced in the early 1950's.
All equipment was removed from the property prior to May 1956. The open cut followed more intensely mineralized fractures; other workings are pits and a 30-foot deep shaft.
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Map Reference: 31°51'11"N , 111°36'33"W
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Mineral List:1 entry listed. 1 valid mineral.
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