Latitude: 31°31'16"N
Longitude: 110°43'22"W
‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 264-265.
Moores, R.C., III (1972) The geology and ore deposits of a portion of the Harshaw district, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 98 p.
Simons, F.S. (1972) Mesozoic stratigraphy of the Patagonia Mountains and adjoining areas, Santa Cruz County, Arizona, in Mesozoic stratigraphy in southeastern Arizona: U.S. Geological Survey Professional Paper 658-E, p. E22.
USGS Mt. Hughes Quadrangle topo map.
U.S. Bureau of Mines field notes.
U.S. Bureau of Mines Coronado National Forest Study Report.
Arizona Bureau of Mines card file Santa Cruz County.
MRDS database Dep. ID file #10048347, MRDS ID #M899934; Dep ID #10234929, MAS ID #0040230177.
A group of Cu-Pb-Ag claims with underground workings located 2½ miles SE of Patagonia in the northeast slope of Red Mountain, at an elevation of about 5,000 feet. It was located in 1890 by Mr. Weatherwax and relocated in 1892 or 1893 by Jacob Johnson, Pete Hansen, and F.R. McAlstin, owners circa 1915.
Mineralization is ore concentrated along a shear zone in andesite and rhyolite porphyry. Country rock is the rhyolite of Red Mountain, locally capped and seemingly intruded by andesite. The deposits contain principally Cu & Pb minerals. In the lower workings, they are associated with an east-west vertical fault or shear zone which lies 450 feet in from the portal. The zone contains dense, chert-like quartz or very siliceous rhyolite, and a 5 foot band of breccia and gouge which carries sulphides. Between this fault and the relatively unaltered andesite near the mouth of the tunnel is 50 feet of gray-white, soft, altered andesite containing disseminated sulphides. Alteration includes surface oxidation to unknown depths. The wall rocks are highly altered.
Beyond the fault, toward the face, the formation is very much broken up and altered rhyolite porphyry comes in. This rock contains widely disseminated pyrite and chalcopyrite, which are concentrated along some of the fissures and are locally coated with chalcocite.
The upper workings open a silicified breccia fault zone 25 feet or more wide in which disseminated sulphides occur, and which is said to average 2% Cu for its entire width. On the south wall there is about 13 inches of quartz containing pyrite, chalcopyrite, and galena, and contains 30 oz. Ag/T. This zone lies in the altered rhyolite porphyry.
Local structures include E-W- and N-S-trending faults in Tertiary volcanics. Thick-bedded, very fine-grained volcanics associated with Red Mountain.
Tectonic elements include the Red Mountain Fault Block, with downthrow to the north.
Workings include a 600 foot crosscut tunnel at 4,775 feet of elevation and drifts and crosscuts at 4,975. The upper workings include an old 50 foot deep shaft, 100 feet of drifts and 220 feet of crosscuts.
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