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Tonopah-Belmont Mine (East Vulture Mine; Belmont-McNeil Mine; Economy Mining Co. Mine), Belmont Mountain, Tonopah, Osborn District, Big Horn Mts, Maricopa Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 38' 52'' North , 112° 55' 55'' West
Latitude & Longitude (decimal): 33.64778,-112.93222
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSh : Hot semi-arid (steppe) climate

A former underground Ag-Au-Pb-Cu mine located in the W½ sec. 36, T.4N., R.W. (Belmont Mountains 15 minute topo map), North of Tonopah and about 20 miles SW of Wickenburg in Belmont Mountain, a craggy, thin peak.

Mineralization involves veins cutting andesite in the Big Horn Mountains. These mountains are made up of a basement of Precambrian schist and gneiss, intruded, and partly covered by the Tertiary andesites.

Workings include a 500-foot deep shaft with levels at 100, 250, 400 & 500 feet.

Mineral List

69 valid minerals. 1 (TL) - type locality of valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Tortonian - Bartonian
7.246 - 41.3 Ma

ID: 2837858
Middle Miocene to Oligocene volcanic rocks

Age: Cenozoic (7.246 - 41.3 Ma)

Stratigraphic Name: Peach Springs Tuff; Apache Leap Tuff

Description: Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite. Thick felsic volcanic sequences form prominent cliffs and range fronts in the Black (Mohave County), Superstition, Kofa, Eagletail, Galiuro, and Chiricahua Mountains. This unit includes regionally extensive ash-flow tuffs, such as the Peach Springs tuff of northwestern Arizona and the Apache Leap tuff east of Phoenix. Most volcanic rocks are 20-30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona, but this unit includes some late Eocene rocks near the New Mexico border in east-central Arizona. (11-38 Ma)

Lithology: Major:{basalt,andesite,dacite}, Minor:{rhyolite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tenney, J.B. (1928) The mineral industries of Arizona. Arizona Bureau of Mines Bull. 125: 83-84.
Elsing, M.J. and R.E.S. Heineman (1936) Arizona metal production. Arizona Bureau of Mines Bull. 140: 94.
Mining Congress Journal, June 1945: 69.
Galbraith, F.W. and D.J. Brennan (1959) Minerals of Arizona: 28.
Moore, R.T. (1969) in Arizona Bureau of Mines Bull. 180 (USGS Bull. 871): 192.
Niemuth, N.J. (1987) Arizona Mineral Development 1984-1986. Arizona Department of Mines & Mineral Resources Directory 29.
Allen, G.B. and W. Hunt (1988) The Tonopah-Belmont Mine, Maricopa County, Arizona. Mineralogical Record: 19(3): 139-144.
Rocks & Minerals (1988) 63: 328.
Rocks & Minerals (1989) 64: 58.
Niemuth, N.J. and K.A. Phillips (1992) Copper Oxide Resources. Arizona Department of Mines & Mineral Resources Open File Rept. 92-10: 10 (Table 1).
Anthony, J.W. et al. (1995) Mineralogy of Arizona, 3rd. ed.: 112, 153, 164, 188, 192, 274, 278, 279, 290, 300, 303, 357, 413, 420, 429.
Giester, G. and B. Rieck (1996) Bechererite, (Zn,Cu)6Zn2(OH)13[(S,Si)(O,OH)4]2, a novel mineral species from the Tonopah-Belmont mine, Arizona. American Mineralogist: 81: 244-248.
Grant, Raymond W., Richard A. Bideaux and Sidney A. Williams (2006) Minerals Added to the Arizona List 1995 to 2005: 1, 7, 8.
USGS 15 minute Belmont Mountains topo. map.
Arizona Department of Mineral Resources (ADMR) Belmont-McNeil mine file.
USGS (2005) Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10062455 & 10113715.

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