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Ray Mine, Scott Mountain area, Mineral Creek District (Ray District), Dripping Spring Mts, Pinal Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 10' 39'' North , 110° 56' 45'' West
Latitude & Longitude (decimal): 33.17750,-110.94583
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:Csa : Hot-summer Mediterranean climate

A Cu-Ag-Au-Mo-Pb-Zn mine located in all of sec. 10, T3S, R13E (Sonora 7.5 minute topo map), about 2¾ miles SSW of Scott Mountain, about 3¾ miles S of Hot Tamale Peak, and about 4 miles NNW of Kelvin. Discovered 1846. First produced 1911. NOTE: This mine, named after the mining town of Ray, subhumed that town (which no longer exists). Residents were moved to the new mining company built town of Kearny; however, Kelvin is the nearest municipality to the mine.

Mineralisation is a porphyry copper deposit hosted in Pinal Schist, Granite Mountain Porphyry, Pioneer Shale of the Apache group, and Dripping Spring Quartzite. Ore control was the intersection of NW and NE fault zones, permeability & type of host rock. Ore concentration was secondary enrichment. Alteration is sericitic, propylitic, biotite-clay, chloritisation, and epidote. Area structures include the Broken Hill fault, West End fault, North End fault and numerous others, mostly normal.

Mineral List

Mineral list contains entries from the region specified including sub-localities

54 valid minerals.

Rock Types Recorded

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Rock list contains entries from the region specified including sub-localities

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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

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]

Serpukhovian - Early Cambrian
323.2 - 541 Ma

ID: 2809121
Mississippian, Devonian, and Cambrian sedimentary rocks

Age: Paleozoic (323.2 - 541 Ma)

Stratigraphic Name: Tapeats Sandstone; Bright Angel Shale; Muav Limestone; Temple Butte Formation; Redwall Limestone; Bolsa Quartzite; Abrigo Formation; Martin Formation; Escabrosa Limestone

Description: Brown to dark gray sandstone grades upward into green and gray shale, overlain by light to medium gray or tan limestone and dolostone. This unit includes the Tapeats Sandstone, Bright Angel Shale, Muav Limestone, Temple Butte Formation and Redwall Limestone in northern Arizona, and the Bolsa Quartzite, Abrigo Formation, Martin Formation, and Escabrosa Limestone in southern Arizona. These rocks record intermittent sea-level rise and inundation in early Paleozoic time. (330-540 Ma)

Lithology: Major:{sandstone,shale,limestone}, Minor:{dolostone,quartzite}

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

Localities in this Region


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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University of Arizona Bulletin 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 28, 29, 46.
Ransome, F.L. (1919), The copper deposits of Ray and Miami, Arizona, USGS PP 115.
Parsons, A.B. (1933) Ray Consolidated Chief in the Porphyry Coppers. A.I.M.E., New York, 1st. edition: 184-203.
Schwartz, G.M. (1934), Paragenesis of the oxidized ores of copper, Economic Geology: 29: 55-75.
Schwartz, G.M. (1947), Hydrothermal alteration in the 'porphyry copper' deposits, Economic Geology: 42: 319-352.
Schwartz, G.M. (1952), Chlorite-calcite pseudomorphs after orthoclase phenocrysts, Ray, Arizona, Economic Geology: 47: 665-672.
Clarke, O.M., Jr. (1953), Geochemical prospectying for copper at Ray, Arizona, Economic Geology: 48: 39-45.
Lewis, D.V. (1955), Relationships of ore bodies to dikes and sills, Economic Geology: 50: 495-516.
Metz, R.A. & A.W. Rose (1966), Geology of the Ray copper deposit, Ray, Arizona, in S.R. Titley and C.L. Hicks (editors), Geology of the porphyry copper deposits, southwestern North America, University of Arizona Press, Tucson: 177-188.
Stephens, J.D. & R.A. Metz (1967), The occurrence of copper-bearing clay minerals in oxidized portions of the disseminated copper deposit at Ray, Arizona (abstract), Economic Geology: 62: 876-877.
Cornwall et al (1971) USGS Map GQ-1021.
Throop, A.H. & P.R. Buseck (1971), Nature and origin of black chrysocolla at the Inspiration mine, Arizona, Economic Geology: 66: 1168-1175.
Phillips, et al (1974) Economic Geology: 69: 1237-1250.
White, J.S., Jr. (1974), What's new in minerals?, Mineralogical Record: 5: 233-236.
Kennezonian, Summer 1977.
Wilson, W.E. (1977), What's new in minerals? (Ray chrysocolla), Mineralogical Record: 8: 58.
Skilling's Mining Review M.M. Sundt Constructing Plant for Kennecott's Ray Mines. March 31, 1979: 6.
Mining (1980) E&MJ Kennecott's New SX Plant on Stream. June, 1980: 35, 39.
Thompson, W. (1980), Chrysocolla pseudomorphs from Ray, Arizona, Mineralogical Record: 11: 248-250.
Arizona Department of Mines & Mineral Resources Primary Copper Industry of Arizona Special Reports Nos. 5 (1981).
Arizona Department of Mines & Mineral Resources Primary Copper Industry of Arizona Special Reports Nos. 6 (1982).
Banks, N.G. (1982) Sulfur and copper in magma and rocks: Ray porphyry copper deposit, Pinal County, Arizona. In: Advances in Geology of Porphyry Copper Deposits, Southwestern North America (S.R. Titley, editor). University of Arizona Press, Tucson, Arizona (227-257).
Kennecott Surprises Industry by Closing Ray, Chino Indefinately (March, 1982): Front cover & 4-5.
Arizona Pay Dirt (1983) Kennecott Reopening Ray Mine and Mill, Calling Back Workers. August, 1983: 18A-19A.
Jones, R.W. & W.E. Wilson (1983), The Ray mine, Mineralogical Record: 14: 311-322.
Walenga, Karen (1985) Kennecott's Ray Mines Division is having a Tough Time. Arizona Pay Dirt: June, 1985: 3A.
Modifying Ray SX-EW to Treat Sulphide Leach. Southwestern Pay Dirt: February, 1987: 4A-6A.
Dayton, S.H. (1988) ASARCO hits the Mark with Arizona Copper Expansion. Engineering and Mining Journal: 189(9): 30-50.
O'Neil, Tim (1989) ASARCO: Plant Expansions and Modernizations Continue Amidst Company Restructuring. Mining Engineering: 6/89: 430-434.
Walenga, Karen (1989) Mission, Ray Expansion to Assure Copper Feed. Southwestern Paydirt, March, 1989: 4A-8A.
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.
Dillard, Gary (1992) Expansion Doubles Production, Lowers Costs. Southwestern Pay Dirt No. 636: 6/92: 4A-11A.
Dillard, Gary (1992) Ray Greatly Expands Ore Reserves Without Drilling a Hole. Southwestern Pay Dirt: 9/92: 3A.
Kilburn, John (1992) Ray Expansion Boosts ASARCO Copper Output. Northern Miner: 11/23/92: 1 & 2.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 15 (Table 1).
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.
Dillard, Gary (1993) Ray Complex is Hit Hardest by Rail link Washout. Southwestern Pay Dirt: 2/93: 4A-10A.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 132, 163, 170, 174, 186, 197, 200, 201, 213, 243, 250, 299, 302, 315.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10106863 (MRDS ID M000327) & 10210616.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0040210006.
USGS 7.5 minute Hayden Quadrangle map.

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