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Bomboy Mine (Bumboy Mine; Bombay Mine; King Copper group), Roblas Butte area, Wood Camp Canyon District, Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 19' 9'' North , 111° 12' 48'' West
Latitude & Longitude (decimal): 33.31917,-111.21333
Köppen climate type:BSh : Hot semi-arid (steppe) climate
Other regions containing this locality:Sonoran Desert, North America

A former underground Cu-Ag-Au-V-Pb mine located in the SW¼NW¼NW¼ sec. 26 T1S, R11E (Picketpost Mountain 7.5 minute topo map), about 1¾ miles SSE of Roblas Butte (old Wood Camp Canyon District). It is 2½ miles westerly from Hewitt Station. Superior is 8 miles east by air, 13 miles by road, on National Forest land. Produced 1916-1971. Owned by Mr. Tom Gray (1958); Ethel Gray had unspecified involvement here. Operators included: Ethel Gray, West and Russell, Guzmann and Schwartz, M., Gray and Davy, C. Bomboy, T.D. Teakell, Dan Kinnard, T.D. Trochell, The King Copper Mine, Anton Johnson (1956), and Tom C. Gray (1955).

Mineralization is a vein deposit comprised of 2 veins, one 3 to 5 feet wide, 70 feet long, and one 4 to 5 feet wide, and 50 feet long. The ore zone overall is 21.34 meters long, 1.52 meters wide, strikes N25E and dips 45E. Quartzite occurs on the hanging wall, diabase dike below. Host rock units are diabase and quartzite. Ore control was along a dike with a N25E trend. This deposit is probably in Precambrian epiclastic rocks. The age of mineralization is unknown. There is no detailed geologic map of the area. Quartzite was reported as Cambrian in 1943. The ADMR advised that it may be Bolsa, or it may be Precambrian Troy Quartzite.

Workings are 213.36 meters total length, 121.92 meters long, 30.48 meters wide, and 60.96 meters deep. Further development of workings may have occurred.

Mineral List

2 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

Cryogenian - Ectasian
635 - 1400 Ma

ID: 2927976
Middle Proterozoic sedimentary rocks

Age: Proterozoic (635 - 1400 Ma)

Stratigraphic Name: Grand Canyon Supergroup; Chuar Group; Unkar Group; Apache Group; Troy Quartzite

Description: Red-brown shale and sandstone, buff to orange quartzite, limestone, basalt, black shale, and sparse conglomerate. This unit includes the Grand Canyon Supergroup, Apache Group, and Troy Quartzite. These rocks were deposited in shallow marine, coastal nonmarine, and fluvial settings. (700-1300)

Lithology: Major:{shale,sandstone,quartzite}, Minor:{limestone,basalt,black shale}, Incidental:{conglomerate}

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.


Flagg, A.L., Vanadium Reports, Book IV.

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

U.S. Bureau of Mines file cluster #402.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.

USGS Picketpost Mountain Quadrangle topo map.

Arizona Department of Mineral Resources Bomboy Mine file.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID #10109779, MRDS ID #M241190; and, Dep. ID #10210569, MAS ID #0040210186.

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