Latitude: 31°29'25"N
Longitude: 110°44'17"W
‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 258.
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.
Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.
USGS Harshaw 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 #10048343, MRDS ID M899930.
A Cu-Fe prospect with underground workings located in the NW¼SW¼ sec. 29, T22S, R16E, 4 miles S of Patagonia, about 1 mile SE of the Blue Eagle prospect and ¾ mile north of the World's Fair Mine, at the end of the wagon road ascending Alum Gulch, on an eastern tributary that lies in the SW base of Red Mountain, at an elevation of about 4,600 feet, on National Forest land.
The mineralization involves a fault fissure in the red porphyritic rhyolite, and an area of sharply upfaulted diorite 800 feet wide lies only 20 feet distant on the south, the formational contact being parallel with the fissure. Sheeting common to both the rhyolite and the diorite dips 45ºE.
The fissure dips steeply to the south and ranges from 9 inches (22.5 cm) to 3 feet (90 cm) wide and dips steeply to the S. It contains mostly crushed, altered, and in part soft rhyolite and rhyolite gouge with some quartz, and in places a 3 to 4 inch (7.5 to 10 cm) quartz vein or stringer, all more or less impregnated with pyrite, and a little chalcopyrite, chalcocite, and some carbonates of iron and copper. Ore concentration was secondary enrichment in irregular concentrations along the shear zone. The area of diorite intrusion is 800 feet wide.
Tectonic elements include the Alum Gulch Fault Block.
Workings include a 60 foot long crosscut tunnel, 100 feet of drifts, and two shallow winzes. No production recorded.
Mineral List
5 entries listed. 4 valid minerals.
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