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Old Mission Mine (Old Bat Mine), Amole District, Tucson Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 32° 10' 3'' North , 111° 1' 19'' West
Latitude & Longitude (decimal): 32.16750,-111.02194
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSh : Hot semi-arid (steppe) climate

‡Ref.: Jenkins, O.P., and Wilson, E.D. (1920) A geological reconnaissance of the Tucson and Amole Mountains, with Notes on the southern section of the Amole mining district, by M.A. Allen: Arizona Bureau of Mines Bulletin no. 106, 29 p.: 6, Plate I.

Kinnison, J.E. (1958) Geology and ore deposits of the southern section of the Amole mining district, Tucson Mountains, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 126 p.: 101, 112-113.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 102 (Table 4).

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

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

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039674, MRDS ID #M050630; and, Dep. ID #10234467, MAS ID #0040190341.

A former small surface and underground Cu-Ag-Pb-Au-Mn-Baryte mine located in East-central sec. 33, T.14S., R.13E. (Cat Mountain 7.5 minute topo map). Owned by Pelligren.

Mineralization is copper oxides, cerussite, acanthite, chlorargyrite, barite, hematite, and jasper in a narrow fissure vein of massive manganiferous siderite in Cretaceous Cat Mountain Rhyolite. Ore control was bedding (Cutaxitic structure). Alteraton was argillitic and silicification. The ore body is 110 meters long, 1.22 meters wide and 2 meters thick and has a strike of approximate NE and dip of a few degrees to the NW.

The vein is subparallel to the cutaxitic structurem in welded tuff host rock but in detail contacts are cross-cutting. Wallrock weakly silicified to weakly argillized. The vein is sheeted, locally containing stringers of purplish-red to dark brown (heavily limonitic), weakly silicified wall rock. Locally, vein material cements wall rock breccia. 30 meters SE of the central part of the vein is a shallow prospect shaft with minor black calcite on the dump. The vein in this pit is probably another vein about 10 meters below the main vein.

Workings include 7 tunnels, one tunnel plus perpendicular cut, and 2 prospect pits. The maximum exposed length of the vein is approximately 100-110 meters, but prospect pits continue both to the E and W of the vein, along the hillside, for 200 meters. Sporadic production occurred in 1920-1921, 1923, and 1937-1938. Total production has been some 150 tons of ore averaging about 1% Cu, 0.3% Pb, 10 oz. Ag/T, and 0.1 oz. Au/T.

Mineral List

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

ID: 2745161
Early Tertiary to Late Cretaceous volcanic rocks

Age: Phanerozoic (47.8 - 83.6 Ma)

Stratigraphic Name: Williamson Canyon Volcanics

Description: Rhyolite to andesite and closely associated sedimentary and near-surface intrusive rocks; commonly dark gray to dark greenish gray or greenish brown. In the ranges west of Tucson, this unit includes thick welded ash-flow tuffs. Volcanic rocks of this unit are inferred to be derived from vents and volcanoes above magma chambers that solidified to form the granitic rocks of map unit TKg. These rocks are restricted to southeastern Arizona except for a small outcrop near Bagdad. (50-82 Ma)

Comments: Related, broadly, to unit TKg

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

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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