Latitude: 31°55'32"N
Longitude: 111°16'21"W
‡Ref.: Wright, R.J. (1950) Reconnaissance of Certain Uranium Deposits in Arizona, U.S. Atomic Energy Commission RMO-679.
US Atomic Energy Commission Preliminary Reconnaissance Report Pima County (1951): 622, 634.
Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in Arizona, USGS Bull. 1147A: A30.
U.S. Atomic Energy Commission RME-159 (1970) Preliminary Reconnaissance for Uranium in Pima and Pinal Counties, Arizona, 1950 to 1957: 13, 59.
MRDS database Dep. ID file #10039557, MRDS ID #M050277; and, Dep. ID #10259545, MAS ID #0040190231.
A group of surface U claims/occurrence/prospect located in the NW ¼, sec. 30, T.17S., R.11E., on the NW flank of the Sierrita Mountains and about 28 miles SSW of Tucson & about 1 mile SSE of the Black Dike deposit. The property covers 4,500 hectares. Leased to Albert Ybarra & Glen Allen of Tucson (1951).
Mineralization is a lenticular ore body 60.96 meters long, 1.83 meters wide and 30.48 meters thick. Radioactive material occurs in and along a breccia zone that strikes N.20ºW. & dips about 80ºSW. The breccia zone contains a silicified core about 6 feet wide from which highly fractured rocks entends several feet on either side. Ore control was the hanging wall of the breccia zone contact with the granite. Radioactive zone is a few feet wide and marked by red, brown, and white stains, and pyrite. Ore concentration was actually deconcentration caused by leaching an weathering. There is much alteration of seritization (?) and silicification. The host rock is granite.
A 4-foot channel sample contained 0.015% U, radioactivity equivalent to 0.035% U. came from a rock sample south lot opencut - 0.027% U, radioactivity = 0.080% U.
Workings include an open cut about 15 feet long by 5 feet wide and 6 feet deep at greatest depth.
Lack of equilibrium in samples indicates that rock in the outcrop has been considerably leached and weathered & uranium is probably more abundant in fresh rock below.
Mineral List
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