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Kofa Mts (S.H. Mts), Yuma Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 19' 48'' North , 113° 57' 10'' West
Latitude & Longitude (decimal): 33.33000,-113.95278
GeoHash:G#: 9myvwgw17
Other regions containing this locality:Sonoran Desert, North America
Locality type:Mountain Range
Köppen climate type:BWh : Hot deserts climate

A mountain range located 20 miles SE of Quartzsite and NE of the Castle Dome Moutnains. The alternate name of S.H. Mountains which allegedly stands for 'Stone House.'

This is an isolated mountainous area in the central part of Yuma County. They cover an area of approximately 200 square miles are are surrounded by broad, gently-aggraded plains that separate them from other detached mountains. The higher summits rise probably 2,000 feet above the surrounding plains.

These mountains are composed of extrusive igneous rocks which rest on an eroded surface of much older rocks. These older rocks are exposed in low foothills in the northern and southern parts of the mountainous area. The volcanic rocks are probably of tertiary and Quaternary age. The older rocks consist of metamorphosed sediments with associated pegmatites, thought to be of Precambrian age, intruded by granite and dike rocks of probable Mesozoic age. These rocks are intricated dissected into flat-topped mesas of small extent or into jagged spires and other fantastic erosional forms.

Mineralization is Au-Cu-Pb deposits that occur in certain fault zones. The bulk of these mountains consists of a gently Northward dipping block of Tertiary rhyolites, andesites and tuffs, capped by basalts, that rises to more than 4,000 feet above sea level, or 2,500 feet above the adjacent plains. Minor areas of schist, granite, and shales are exposed at the base of the volcanics. The granite is of interest since it contains copper deposits. Extensive faulting and fracturing have affected all of the rocks, particularly those of the pre-lava age.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

27 valid minerals.

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 151-164.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 106-109.
Walker, L.W. (1957), The geodes of Kofa, Nature: 50: 266-267.
Dale, V.B. (1959), Tungsten deposits of Yuma, Maricopa, Pinal, and Graham Counties, Arizona, U.S. Bureau of Mines Report of Investigation 5516.
Dahm, J.B., and Hankins, D.D. (1982) Preliminary geology of a portion of the southern Kofa Mountains, Yuma County, Arizona, in Frost, E.G., and Martin, D.L., eds., Mesozoic-Cenozoic tectonic evolution of the Colorado River region, California, Arizona, and Nevada - Anderson-Hamilton Volume: San Diego, Cordilleran Publishers, p. 459-469.
Hankins, D.D. (1984) Geologic map of a portion of the southern Kofa Mountains, Arizona: Arizona Bureau of Geology and Mineral Technology Miscellaneous Map MM-84-A, 1 sheet, scale 1:12,000.
Hankins, D.D. (1984) Geologic setting of precious metals mineralization, King of Arizona district, Kofa Mountains, Yuma County, Arizona: San Diego, San Diego State University, M.S. thesis, 135 p., 1 sheet, scale 1:12,000.
Charlton, D.W., Copeland, D.J., Reaugh, L.W., and Westall, N.D. (1985) Gold mineralization in low angle faults, Verdstone property, Kofa Mountains, Arizona [abs.]: Geological Society of America Abstracts with Programs: 17(6): 348.
Blair, Gerry (1992), The Rockhound's Guide to Arizona: Helena, MT, Falcon Press: 157.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 236, 349, 364.
Ferguson, C.A., and Skotnicki, S.J. (1996) Geology of the northern Kofa Mountains (Owl Head and northern third of the Kofa Butte 7.5' quadrangles), Yuma and La Paz Counties, Arizona: Arizona Geological Survey Open-File Report 96-03, 22 p., 2 sheets, scale 1:24,000.
Skotnicki, S.J., and Ferguson, C.A. (1996) Geology of the Cholla Tank and northern third of the Hoodoo Well quadrangles), northern Kofa Mountains, Yuma and La Paz Counties, Arizona: Arizona Geological Survey Open-File Report 96-24, 11 p., 1 sheets, scale 1:24,000.

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