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Bunker Hill Mine (Bunker Hill group), Mulberry Wash, Sombrero Butte, Sombrero Butte peak area, Bunker Hill District (Copper Creek District), Galiuro Mts, Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 32° 44' 12'' North , 110° 28' 42'' West
Latitude & Longitude (decimal): 32.7366666667, -110.478333333
Other regions containing this locality:Sonoran Desert, North America

A former surface and underground Pb-Cu-Ag-Au-Mo mine located on 6 unpatented claims in (1964), in the W½ sec. 14, T8S, R18E (Rhodes Peak 7.5 minute topo map), in Mulberry Wash, near Sombrero Butte ghost town and about 1 mile N of Sombrero Butte (peak), south of the Copper Creek area, on BLM-administered land. Acquired in 1917 by Bunker Hill Copper Co. and worked for Pb-Cu ore during 1918. Owned and operated by Fred E. Lehman and Little Hill Mines of Oracle, AZ (1964). Other operators included Arizona Butte Operating; and South Pacific Ore. Intermittent production continued during 1923-1929, 1934 and 1936 and ended in 1964. The claims extend into secs. 10, 11, 12 and 15.

Mineralization is hosted in the Copper Creek Granodiorite. The ore zone strikes N70W and dips vertically. Fracture zone intersections near quartz diorite and porphyry dikes were ore control elements. Fissure filling is the prominent process, some evidence of replacement. Local structures include E-W-trending faults, ENE-trending faults in granodiorite, major NNW-trending fault west of the mine, small N10°W-N20°W faults near breccia, main fissure N20°W, and joint lanes E-W with a steep (80-85S) dip. Yonger andesite tuff overlies granodiorite.

Workings include at least 5 levels and at least 1600 feet of drifts, 1000 feet of crosscuts. The length of the workings is estimated. 2 shafts and one or more adits to a depth of 121.9 meters. Drilling and shaft repair were pursued in 1964.

Mineral List

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

7 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

Ypresian - Campanian
47.8 - 83.6 Ma
Early Tertiary to Late Cretaceous granitic rocks

Age: Phanerozoic (47.8 - 83.6 Ma)

Description: Porphyritic to equigranular granite to diorite emplaced during the Laramide orogeny. Larger plutons are characteristically medium-grained, biotite +/- hornblende granodiorite to granite. Smaller, shallow-level intrusions are typically porphyritic. Most of the large copper deposits in Arizona are associated with porphyritic granitic rocks of this unit, and are thus named 'porphyry copper deposits'. (50-82 Ma)

Comments: Laramide metaluminous; associated with porphyry Cu deposits

Lithology: Major:{granite,granodiorite,diorite}

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

Localities in this Region


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.


Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Cllection, University of Arizona Library & Arizona Bureau of Mines Library: 333.

Eising and Heineman (1936) Arizona Bureau of Mines Bulletin 140.

Kuhn, T.H. (1941) Pipe deposits of the Copper Creek area. Economic Geology: 36(5): 512.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 57.

US Atomic Energy Commission Preliminary Reconnaissance Report 172-488 (1953): 35.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 13 (Table 1).

USGS Rhodes Peak Quadrangle map.

USGS Oak Grove Canyon Quadrangle map.

U.S. Bureau of Land Management Mining District Sheet 741.

Arizona Department of Mineral Resources Bunker Hill file.

Arizona Department of Mineral Resources Magma Chief Mine file.

Arizona Department of Mineral Resources U file.

U.S. Bureau of Mines file data.

MRDS database Dep. ID #10048309, MRDS ID #M899873; and Dep. ID #10162162, MAS D #0040210205.

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