Latitude: 31°20'8"N
Longitude: 110°41'25"W
A former small underground Cu-Ag-Au-Mo-Fe-Li-V mine located on 11 unpatented claims in the SE¼ sec. 22, T24S, R16E, about 3/4 mile SW of the Benton Mine, just north of post 113 of the international boundary, S of Duquesne, on National Forest land. Former owners included Capt. O'Connor (1910); Mr. Don Hamerly; and, Mr. Haverly.
Country rock is the gray quartz monzonite which is intruded by a small stocklike mass of granite porphyry that trends north and is about 300 feet wide. From the mass of granite porphyry near the middle of the claim a 10 foot thick dike extends to the WNW and dips steeply to the north. Much white mica is developed in the quartz monzonite near the contact.
Mineralization is a deposit with an ore zone 1.83 meters wide. A 10 foot dike extends from a granite porphyry mass to the NW and dips steeply to the N. A sheet of specularite 3 feet wide follows the hanging wall side of the dike. Considerable amounts of white mica developed in quartz monzonite near the contact. The metallic minerals pyrite, chalcopyrite, and molybdenite, with a little bornite and films of chalcocite, are particularly abundant along the contact of the two rocks and are concentrated in joint planes and fissures, locally with a little associated quartz in small stringers and veins, and the adjoining quartz monzonite is partly impregnated with them. Along the hanging wall side of the dike occurs a sheet of specularite 3 feet wide. Ore control was the contact of a porphyry dike and quartz monzonite, joint planes and fissures. Ore concentration was precipitation from thermal solutions whose circulation accompanied or followed intrusions. Alteration is silicification and sericitization.
An orebody encountered in 1910 is a 6 foot wide vein carrying 11% to 24% Cu. The ore contains principally chalcopyrite, with 15% to 20% of bornite.
Workings include 3 shafts and 2 tunnels totalling 56.39 meters in length and 24.38 meters in depth. Two of the shafts, each 50 feet deep, being at the top of the hill and the third, 80 feet deep, at the north base of the hill. One tunnel is 65 feet long and follows the north or hanging wall side of the dike, the other tunnel is 120 feet long.
References
Schrader, F.C., and Hill, J.M. (1910,) Some occurrences of molybdenite in the Santa Rita and Patagonia Mountains, Arizona, in Contributions to economic geology (short papers and preliminary reports) 1909 - Part I--Metals and nonmetals except fuels: U.S. Geological Survey Bulletin 430, p. 154-163.
Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 347-348.
University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 24, 40.
Schrader, F.C. (1917), The geologic distribution and genesis of the metals in the Santa Rita-Patagonia Mountains, Arizona, Economic Geology: 12: 237-269.
Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 25.
Wilson, E.D. & G.H. Roseveare (1949), Arizona nonmetallics: a summary of past production and present operations (2nd. ed.), Arizona Bureau of Mines Bull. 155.
Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 39, 105.
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.
Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 284, 430.
USGS Lochiel Quadrangle topo map.
U.S. Bureau of Mines field notes.
U.S. Bureau of Mines Coronado National Forest Study Report.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.
Arizona Bureau of Mines card file Santa Cruz County.
Arizona Department of Mineral Resources Line Boy Mine file.
MRDS database Dep. ID file #10026975, MRDS ID #M001446; and, Dep. ID #10259249, MAS ID #0040230448.
Mineral List
10 entries listed. 6 valid minerals.
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