Latitude: 32°44'57"N
Longitude: 110°29'44"W
A former Cu-Mo-Pb-Zn underground mine located in sec. 11, T8S, R18E, on W slope of North-central Galiuro Mountains on the Copper Creek - Sombrero Butte Road, several hundred feet SW of Copper Creek about ½ mile SE of the Childs-Aldwinkle Mine, and about 1¾ downstream (WSW) of Copper Creek ghost town, on federal land.
Mineralization is in a breccia pipe hosted in dacite. The ore zone is 762 meters long, 457.2 meters wide, 15.24 meters thick, striking N60E and dipping 70N. Concentration process was replacement during an early stage of brecciation. Ore control was fractures, blowout or chimney. At the blowout a replacement vein 6-18 feet wide lies against fresh diorite, thus an atypical chimney deposit. Further, the chimney is mainly cracked sericitized diorite with ore at joint intersections rather than a breccia. Alteration is sericite with breccia pipes and dacite porphyry; potassic and argillic, lesser propylitization, silicification, and tourmalinization. Host rock is the Copper Creek granodiorite. Related structure is block faulting trending NNW; strong zone of faulting striking E-W and cut by cross-faults striking N60°E and N20°E.
Assay data: 3% by weight total sulfides. In some areas of the mine near the 200 level, the richest ore averages 14% Cu. Where the vein is 50 feet wide (300 LEVEL), only 6 feet is ore grade. The rock is not leached. Where the vein is 30-49 feet wide (200 LEVEL), 18 feet is ore grade near the top, 6-18 foot wide vein is all ore.
Workings include stopes, which are caved, the adit is flooded. Production: The size of the underground workings still open indicates that an appreciable amount of ore was extracted.
References
Weed, W.H. (1913) Mining and Engineering World: 38: 375-378.
Kuhn, T.H. (1941) Pipe deposits of the Copper Creek area. Economic Geology: 36(5): 512-522.
Simons, F.S. (1964), Geology of the Klondyke quadrangle, Graham and Pinal Cos., AZ: USGS PP 461.
Guthrie, J.O., and Moore, D.G. (1978) The geology of the Copper Creek area, Bunker Hill mining district, Galiuro Mountains, Arizona, in Jenney, J.P., and Hauck, H.R., eds., Proceedings of the Porphyry Copper Symposium, Tucson, Arizona, March 18-20, 1976: Arizona Geological Society Digest: 11: 25-31.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 401.
MRDS database Dep. ID #10039464; MRDS ID #M050121.
Mineral List
8 entries listed. 7 valid minerals.
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