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Picacho Mine (Cahuabi Mine; Cababi Mine), Sells, Cababi District (Comobabi District), Comobabi Mts, Tohono O'odom (Papago) Indian Reservation, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 32° 3' 27'' North , 111° 56' 47'' West
Latitude & Longitude (decimal): 32.05750,-111.94639
Other regions containing this locality:Sonoran Desert, North America

‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 47.

Copper Handbook (1910-1911).

The History of Arizona, 2nd. state legislature, Chap. X: 124.

Weed, W.H. (1922) The Mines Handbook, Vol. XV.

MacKallor, J.A. (1957) Geology of the western part of the Cobabi mining district, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 108 p.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 112 (Table 4).

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10109619, MRDS ID #M050620; and, Dep. ID #10283212, MAS ID #0040190360.

A former small surface and underground Ag-Cu-Au-Pb-Zn mine located in the SW¼ sec. 3 and the NW ¼ sec. 9, T.16S., R.4E. (protracted), 9½ miles W of Comobabi. Operated 1850-1965. Owned by Bustamonte; Ehrenberg; Don L.J.F. Jaeger of Yuma; Jaeger & Halstead; Francisco Padres; Choate; Cababi Mining Co.; the Picacho Mining Co.; Bartlett; and, Redhead. Operators included the Picacho Mines Inc.; J.D. Coffman; and, Elden Wilkerson.

Mineralization is faulted, crystalline quartz veins with minor milky quartz, calcite and siderite, with gouge along vein walls, in a major fault zone cutting Cretaceous (?) andesite flows and invaded by andesite and felsic dikes. The ore zone strikes N70E and dips 70NW. Irregular base metal and iron oxides and sulfides. Spotty rich silver values, particularly in the oxidized zone. The sulfides are associated with quartz not carbonates.

Local structures include a major fault zone.

Workings include shaft and pit operations with a length of 304.8 meters and a depth of 182.88 meters. Worked prior to the 1850's and sporadically up to the 1960's. 25 men employed as of 1949. Produced at least 500 tons of ore averaging about 250 oz. Ag/T, 0.3 oz. Au/T and minor Cu & Pb. Produced 240,000 oz. Ag. (before 1914).

Mineral List

10 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

Tithonian - Bajocian
145 - 170.3 Ma
Jurassic sedimentary and volcanic rocks

Age: Jurassic (145 - 170.3 Ma)

Stratigraphic Name: Gardner Canyon Formation; Rudolfo Redbeds; Recreation Red Beds; Topawa Group; Harquar Formation

Description: Sandstone and conglomerate derived from volcanic rocks with associated intermediate-composition lava flows, breccias, and tuffs. In southern Arizona this unit includes rocks of the Artesa sequence, Pitoikam Formation, Mulberry Wash volcanics, Rudolfo Red Beds, Recreation Red Beds, and Gardner Canyon Formation. In western Arizona it includes the Harquar Formation, rocks of Slumgullion, and related(?) unnamed units in the Kofa and Middle Mountains. This unit is characterized by maroon, brown, and purplish-gray volcanic-lithic sandstone and siltstone, with subordinate to abundant conglomerate, quartz-rich sandstone and sparse limestone. (150-170 Ma)

Lithology: Major:{sandstone,siltstone,conglomerate}, Minor:{felsic volcanic,limestone}

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

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