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Bunker Hill District (Copper Creek District), Galiuro Mts, Pinal Co., Arizona, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 32° North , 110° West (est.)
Margin of Error:~2km
Other regions containing this locality:Sonoran Desert, North America

This district lies in eastern Pinal County and includes an area approximately 10 miles long by 4 miles wide in the northwestern portion of the Galiuro Mountains. Mining for silver occurred here as early as 1863 and the district was recorded in 1883.

The oldest rocks exposed in the Copper Creek area consist of limestone, quartzite, conglomerate, shale, and sandstone, interbedded with a complex series of andesite, rhyolite, and dacite tuffs and flows, and intruded by sills and dikes of andesite and dacite. All of these rocks are probably of Cretaceous age. They are overlain by an extensive series of basalt flows, presumably of late Cretaceous or early Tertiary age, which cap much of the Galiuro Mountains. A medium-grained rock, predominantly granodiorite, intrudes the Cretaceous (?) series. Gila conglomerate, Pliocene in age, is faulted against the Cretaceous (?) rocks near the mountain front.

Four general directions of faulting have been determined. In addition, one fault marked by considerable breccic strikes N.55º to 60º W.

Faults in an east-west system, striking from N.85ºW. to S.85ºW., and dipping from 75ºS. to 75ºN., are especially prominent in the southern and western portions of the area. Associated with them are the Childs-Adwinkle, American Eagle, Copper Prince, Copper Giant, Old Reliable, Globe, and numerous other breccia pipes. The faults of this system, characterized by considerable gouge, are believed to have resulted from shearing stresses. Most of the E-W faults cannot be traced for more than a few hundred feet, although one has been followed vertically for 850 feet in the Childs-Adwinkle Mine and mapped on the surface for a length of half a mile, and anothert extends westward for more than a mile from the American Eagle Mine.

A second system trend N.55º to 60ºE., range in dip between 75ºSE and 75ºNW, but most are almost vertical. This system is strongest in the northeastern portion of the intrusive area in vicinity of numerous breccia pipes. Outcrops resemble those of the last system but contain ore minerals more abundantly. The southwesterlt-trending Blue Bird fissure has been followed on the 525 level for 1,800 feet, and has been mapped on the surface intermittently for almost a mile.

A third system strikes N.65º to 75ºW. and dip almost vertically.

The fourth system is comprised of tight vertical faults striking N.10ºW. and occur sparingly throughout the district and are present near most of the breccia pipes. Outcrops of some of the breccia pipes are aligned in this direction.

The breccia pipes are breccia bodies rudely circular to elliptical in plan and having great vertical extent. From 100 to 125 such bodies have been noted in the Copper Creek area, only a few of which are ore-bearing. They occur in string fracture zones or at intersections of fractures.

Redhawk Resources is the current owner of many of the mining claims in the Copper Creek District. In speaking to the mine geologist in Feb 2016, Redhawk Resources may consider requests to collect in the area if given advanced notice and information about those who will be collecting. Collecting without permission may be considered as trespassing.

Mineral List

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

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


Mineralization age: Paleocene : 61 Ma to 60.4 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
ⓘ Molybdenite (youngest age)60.4 MaChilds-Adwinkle Mine (Childs and Altwilkle Mine; Childs-Aldwinkle Mine), Copper Creek, Copper Creek (Copper Creek Canyon), Bunker Hill District (Copper Creek District), Galiuro Mts, Pinal Co., Arizona, USA
ⓘ Molybdenite (oldest age)61 MaChilds-Adwinkle Mine (Childs and Altwilkle Mine; Childs-Aldwinkle Mine), Copper Creek, Copper Creek (Copper Creek Canyon), Bunker Hill District (Copper Creek District), Galiuro Mts, Pinal Co., Arizona, USA

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.


Pickard, B.O. (1912) Bunker Hill mining district of Pinal County, Arizona: Mining Science: 66: 281-282.

Kuhn, T.H. (1951) Bunker Hill district, Chap. VII, in Wilson, E.D., et al (1951), Arizona zinc and lead deposits, Part II: Arizona Bureau of Mines Bulletin no. 158: 56-65.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 60, 63, 84, 102, 103.

Simons, F.S. (1964), Geology of the Klondyke quadrangle, Graham and Pinal Counties, Arizona, 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, Ariz., March 18-20, 1976: Arizona Geological Society Digest: 11: 25-31.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 242, 262, 365.

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