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Old Yuma Mine (Yuma Mine), Saguaro National Monument, Amole District, Tucson Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 32° 18' 53'' North , 111° 7' 16'' West
Latitude & Longitude (decimal): 32.31472,-111.12111
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BSh : Hot semi-arid (steppe) climate

Ref.: Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.

Guild, F.N. (1911), Mineralogische Notizen, Zeit. Krystal. und Mineral.: 49: 321-331.

University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 59, 61.

Guild, F.N. (1917), A microscopic study of the silver ores and their associated minerals, Economic Geology: 12: 297-353.

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, 16-17, Plate I.

Newhouse, W.H. (1934), The source of vanadium, molybdenum, tungsten and chromium in oxidized lead deposits, American Mineralogist: 19: 209-220.

Frondel, C. (1935), Catalog of mineral pseudomorphs in the American Museum, Bull. American Museum of Natural History: 67.

Galbraith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 70, 73, 80.

Bideaux, R.A., et al (1960), Some new occurrences of minerals of Arizona, Arizona Geological Society Digest: 3: 53-56.

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).

Jones, D. (1983). "Famous mineral localities: the Old Yuma mine." Mineralogical Record: 14(2): 95-107, 326.

Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, Arizona Department of Mines & Mineral Resources Directory 29, 46 pp.

Rocks & Minerals (1988): 63: 310 & 328.

Rocks & Minerals (1989): 64: 58.

Rocks & Minerals (1990): 65: 23.

Sawyer, M.B., Gurmendi, A.C., Daley, M.R., and Howell, S.B. (1992) Principal Deposits of Strategic and Critical Minerals in Arizona, U.S. Bureau of Mines Special Publication, 334 pp.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 158, 201, 225, 229, 307, 331, 410, 420, 426.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10103758, MRDS ID #M050625; and, Dep. ID #10234968, MAS ID #0040190345.

A former small surface and underground Pb-Cu-Zn-Mo-Ag-Au (V) mine located in the center of sec. 9, T.13S., R.12E, 1 mile ENE of the Tucson Mountain Park. Owned/operated, in whole or in part, by Col. Randolph; the International Ore Separation Co.; Reilly Mines Co.; Consolidated Mining And Milling (1986); and the Tucson Ore Milling Co.

Mineralization is lens-shaped ore masses with partly oxidized base metal sulfides with spotty wulfenite and vanadinite, and quartz and calcite gangue, in a steeply-dipping, lensing, and faulted orebody along a fracture zone cutting Cretaceous andesite and associated with a Laramide porphyritic intrusive. The ore zone is 5 meters wide, strikes N60E and dips 40S. Ore concentration was supergene enrichment. Alteration includes argillitic.

Workings include a shaft and underground workings to at least the 300 foot (95 meter) level. A later open cut exposed underground stopes; numerous shafts, pits. The development of underground workings and heap leach facility occurred in 1984-1986. This mine produced sporadically from 1916 through 1947, with a total of some 5,700 tons of ore averaging about 4% Pb, 1% Cu, 0.6% Zn, 0.3% Mo, 1 oz. Ag/T and 0.1 oz. Au/T. ($3/t Au - period values). Average mine ore contained 2-3% wulfenite.

Mineral List

17 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

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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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