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Double Standard Mine (Dudley-Standard Mine), Washington Camp-Duquesne District, Patagonia District, Patagonia Mts, Santa Cruz Co., Arizona, USA

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A former small surface and underground Zn-Cu-Pb-Ag-Au mine located in the North of center (NE¼) sec. 3, T24S, R16E, W of Washington Gulch, Duquesne, on National Forest land. Produced 1900-1951. Owned at times, or in part, by the Duquesne Mining & Reduction Co.; Byrd; and, Nash Mines.

Mineralization is partly oxidized sulfides, disseminated, and in bunches, in two parallel zones in pyrometasomatized Permian Naco Group limestone along strong fault zones and close to Laramide granodiorite.

Workings include shaft, tunnel, and open cut operations. Mined intermittently from the early 1900's through 1951. Produced some 300-400 tons of ore averaging about 6% Zn, 3% Cu, 2% Pb, 3 oz. Ag/T and minor Au.

Mineral List

4 entries listed. 4 valid minerals.

The above list 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.


Warren, C.H. (1903), Native Arsenic from Arizona, American Journal of Science: 16: 337-340.

Struthers (1904).

Crosby, W.O. (1906) The limestone-granite contact deposits of Washington Camp, Arizona: American Institute of Mining Engineers, Transactions, v. 36, p. 626-646.

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

Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 329.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 12.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 77 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 119, 263.

Arizona Department of Mineral Resources Duquesne file.

Arizona Bureau of Mines card file Santa Cruz County.

MRDS database Dep. ID file #10026784, MRDS ID #M000230; and, Dep. ID #10256424, MAS ID #0040230168.

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