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Andrada Marble Quarry, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 56' 52'' North , 110° 43' 5'' West
Latitude & Longitude (decimal): 31.94778,-110.71806
Other regions containing this locality:Sonoran Desert, North America

Ref.: USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871), 638 pp.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 123 (Table 4).

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

Arizona Department of Mines & Mineral Resources (1988), Directory of Active Mines in Arizona, incorporating sand and gravel operations, Arizona Department of Mines & Mineral Resources Directory, 13 p.

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

Phillips, K.A., Beard, R.R., Niemuth, N.J., and Bain, D.R. (1991) Active Mines in Arizona – 1992: Arizona Department of Mines and Mineral Resources Directory 39, 20 pp.

Eyde, T.H. and Eyde, D.T. (1992) Present and Past Producers of White Calcium Carbonate Products in Arizona. In: Houser, B.B., editor, Industrial Minerals of the Tucson Area and San Pedro Valley, Southeastern Arizona: Tucson, Arizona, Arizona Geological Society Field Trip, April 4-5, 1992, Guidebook: 37-47.

Houser, B.B. (1992) (editor) Industrial Minerals of the Tucson Area and San Pedro Valley, Southeastern Arizona: Tucson, Arizona. Arizona Geological Society Field Trip, April 4-5, 1992, Guidebook, 55 pp.: 37-47.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10060227, MRDS ID #TC10194; and, Dep. ID #10186174, MAS ID #0040190098.

A crushed marble/dimension stone quarry located in the NW ¼ sec. 21, T.17S., R.16E., 17 miles SE of Tucson, NW of the Whitlock Hills, on the N and NE flanks of Dry Mountain (Phillips gives legal description as sec. 30, T17S, R 17E). The location is for the northern-most quarry in section 21. First produced 1959. Operated by the Georgia Marble Co., Inc. (1991). Previously operated by the Andrada Marble Company, Inc.

Mineralization is faulted and metamorphosed Paleozoic limestone.

Marblized Escabrosa Limestone at least 300 feet thick with extensions along strike and down dip. Locally fractures and faults have led to stained and off-colour marble. Below the weathered zone, the marble is a uniform white colour, although there are some zones of gray limestone.

Impure diatomite beds are interbedded with volcanic ask and zeolites. Individual diatomaceous units change character laterally.

The marble product from this quarry is used for calcium feed additive, plastering material, decorative stone, and roofing material. Past production of limestone. Marble is hauled 19 miles from the quarry to a crushing and screening plant on Drexel Road in Tucson using a 20-ton semitrailer. This quarry is the largest producer of screen grades of calcium carbonate products in Arizona. Georgia Marble (1992) is constructing a new processing plant at the quarry site. The mill capacity was 3000 tons/month.

Workings include an open quarry operation but there are shallow prospect pits and trenches. An indefinate amount of stone was taken for roofing granules and decorative purposes. The quarry was about 1000 feet (304.8 meters) long , 800 feet (243.84 meters) wide, and 200 feet (60.75 meters) deep in 1992. In 1992, reserves were considered adequate to sustain current production for at least 20 years. There are also extensive undeveloped reserves on the adjoining Arizona state mineral leases.

Mineral List

1 valid mineral.

Rock Types Recorded

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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
Early Tertiary to Late Cretaceous granitic rocks

Age: Phanerozoic (47.8 - 83.6 Ma)

Description: Porphyritic to equigranular granite to diorite emplaced during the Laramide orogeny. Larger plutons are characteristically medium-grained, biotite +/- hornblende granodiorite to granite. Smaller, shallow-level intrusions are typically porphyritic. Most of the large copper deposits in Arizona are associated with porphyritic granitic rocks of this unit, and are thus named 'porphyry copper deposits'. (50-82 Ma)

Comments: Laramide metaluminous; associated with porphyry Cu deposits

Lithology: Major:{granite,granodiorite,diorite}

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

This page 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.
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