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Swisshelm Mts, Cochise Co., Arizona, USA

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‡Ref.: Loring, W.B. (1947) Geology and ore deposits of the Mountain Queen area, northern Swisshelm Mountains, Arizona: Tucson, University of Arizona, M.S. thesis, 65 p.

Galbraith, F.W., and Loring, W.B. (1951) Swisshelm district, Chap. III, in Arizona zinc and lead deposits, Part II: Arizona Bureau of Mines Bulletin no. 158, p. 30-36.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureauof Mines Bull. 158: 30-31.

Dunne, J.A. (1957) Tungsten mineralization at the Swisshelm Mountains, Cochise County, Arizona: New York, Columbia University, M.S. thesis.

Rogers, Thornwell H. (1957) Stratigraphy and structure of the southern Swisshelm Mountains, Cochise County, Arizona: University of California.

Dale, V.B. (1959), Tungsten deposits of Yuma, Maricopa, Pinal, and Graham Counties, Arizona, U.S. Bureau of Mines Report of Investigation 5516.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 93.

Diery, H.D. (1964) Petrography and petrogenetic history of a quartz monzonite intrusive, Swisshelm Mountains, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 100 p.

Thayer, D.W. (1973) Pennsylvanian lepospondyl amphibians from the Swisshelm Mountains, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 66 p.

Druke, P.A., (1979) Geomorphology of fault scarps on the northwest side of the Swisshelm Mountains, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 86 p.

Gillette, R.S. (1983) Geology and mineralization of the east-central and southeastern Swisshelm Mountains, Cochise County, Arizona: Tucson, University of Arizona, M.S. thesis, 94 p.

Drewes, H.D. (1991) Geologic map of the Swisshelm Mountains, and a description of the development of the Swisshelm and Pedregosa Mountains, Cochise County, Arizona [Leslie Canyon, and Swisshelm Mtn. 7.5 min.]: U.S. Geological Survey Miscellaneous Investigations Series Map I-2177, 1 sheet, scale 1:24,000.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 144, 228, 234, 362.

Yale Peabody GNIS database.

The Swisshelm Mountains form a range about 15 miles long which extends NNW from the Chiracahua Mountains, on the east side of Sulphur Springs valley. A small valley, about 5,500 feet above sea level or some 1,000 feet lower than the nearby peaks, trends through the mining area.

These mountains are comprised of rock series from Cambrain to Tertiary. The Cretaceous and older rocks are intruded by granite which crops out over much of the western portion of the range. Its age is tentatively considered as Laramide (late Cretaceous - early Tertiary). Numerous small dikes of diorite cut the granite. A relatively thin, tabular mass of diorite porphyry crops out in the central part of the district.

The post-Cretaceous structural history of the Swisshelm Mountains includes intense folding, thrust faulting, and normal faulting.

The ore deposits of the Swisshelm district occur as replacements in Naco limestone.

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