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Walker Mine, Big Casa Blanca Canyon, Wrightson District, Santa Rita Mts, Santa Cruz Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 40' 3'' North , 110° 49' 14'' West
Latitude & Longitude (decimal): 31.6675, -110.820555556
Other regions containing this locality:Sonoran Desert, North America

A Ag-Cu occurrence/mine with underground workings located in the NE¼NW¼ sec. 28, T.20S., R.15E. (Mount Wrightson 15 minute topo map), 10 miles NNW of Patagonia and 2½ miles north of the Anaconda camp, near the head of the south fork of Casa Blanca (formerly Josephine) Canyon, at an elevation of 5,750 feet, on National Forest land. First worked in 1894. Owned by H.C. Hale, of Patagonia (circa 1910). Mr. J.F. Walker had unspecified involvement here (1918).

The deposits are contained in a 5 foot wide siliceous iron-stained vein which dips 80ºNW, in crudely bedded andesitic agglomerate and tuff which dip 40ºSE. The vein consists mainly of crushed tuffaceous andesite cemented by quartz, and the ore contains principally this gangue coated with azurite, malachite, and seemingly bromargyrite. Ore assays as high as 1,000 oz. Ag/T.

Mineral List

3 valid minerals.

Regional Geology

This 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 data will improve over time as more accurate maps and data sets are added.

Cretaceous66 - 145 MaCretaceous plutonic rocks

Plutonic rocks

Deep-seated to high-level intrusions are included. Many charnockites, anorthosites, and large ophiolites, classified as plutons, are distinguished in the database using the SIGNIF item. Ophiolites were classified as plutons, even where remnants may be extrusive and/or sedimentary.

Cretaceous - Jurassic66 - 201.3 MaJurassic-Cretaceous volcanic: interlayered sedimentary and volcanic rocks

Volcanic: interlayered sedimentary and volcanic rocks

Middle Jurassic - Early Jurassic163.5 - 201.3 MaJurassic volcanic rocks

Major:: {rhyolite},Minor:: {felsic metavolcanic rock},Incidental:: {metarhyolite, conglomerate, dacite, felsic metavolcanic rock, quartz-feldspar schist, sandstone, arenite, arkose, granite, porphyry, meta-conglomerate, orthoquartzite, quartzite}

Massive quartz-feldspar porphyry, generally interpreted as thick, welded rhyolitic tuffs, with locally abundant lava, and sandstone and conglomerate derived from volcanic rocks. Rare eolian quartzite units are interbedded in southern Arizona. Includes Ali Molina Formation, Mount Wrightson Formation, part of the Canelo Hills Volcanics, Cobre Ridge tuff, Black Rock volcanics, Planet Volcanics, and equivalent rocks. (160-200 Ma)

The Jurassic quartz porphyry, Ali Molina, Mt Wrightson, Cobre Ridge, Black Rock volcanics, Planet Volcanics, .

References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

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.


Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 237.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 16 (Table 1).

USGS Mt Wrightson Quadrangle 7.5 minute topo map.

U.S. Bureau of Mines field notes, AG15.

Arizona Bureau of Mines card file Santa Cruz County.

MRDS database Dep. ID file #10283665, MAS ID #0040230400.

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