Santa Cruz deposit (Casa Grande Santa Cruz deposit; Francisco Grande deposit; Fanny-Granny deposit; Franny-Granny deposit; Casa Grande; Casa Grande West), Casa Grande area, Casa Grande, Casa Grande District, Pinal Co., Arizona, USA
A former underground Cu-Mo-Au-Ag deposit/prospect located in the center sec. 13 and sec. 24, T6S, R4E, and in sec. 19, T6S, R5E (Stanfield 7.5 minute topo map), about 7¼ miles W of Casa Grande proper (halfway between Casa Grande and Stanfield). Discovered 1976. Owned by the Casa Grande Copper Co.
Mineralization is a porphyry copper deposit. The ore zone is 2000 meters long, 800 meters wide, with a depth-to-top of 1600 meters and a thickness of 1700 meters. May be the largest atacamite deposit in the world. Ore control was intrusions and faulting.
The high grade of the ore body is due to a supergene enrichment zone composed of atacamite and chrysocolla in the oxide zone.
No production as yet, reserves proven for future open pit operations.
References:
Greeley (1978) Arizona Department of Mineral Resources Special Report 2: 83-87.
Ullmer (1978) Journal of Geochemical Exploration: 9(2-3): 235-236.
Paydirt (1982) Casa Grande Copper Project on 'Back Shelf'. No. 522, Dec. 1982: 7.
Paydirt (1984) Getty Pays $10 Million for Land near Casa Grande Orebody: No. 541, July, 194: 21A-22A.
Cook, S.S. (1988b), Petrologic studies of the supergene copper mineralization at the Santa Cruz copper deposit, Pinal Co., Arizona (abstract), Geological Society of America Abstracts with Progs. 20: A336.
Mining Magazine (1988) In Situ Copper Mining Tests in U.S.A., December 1988: 460.
Ahlness and Millenacker (1989) Bureau of Mines Investigates i Situ Copper Mining Feb-Mar 1989: 9-15.
Dahl, Linda J. (1989) Summary Report - Casa Grande, American Mining Congress Journal, 2/89: 16.
Mining Journal, London (1989) Draft Mine Design, September 29, 1989.
The Mining Record (1990) ASARCO Takes Legal Action in Mining Research Venture, March 1990: 3.
Mining Engineering (1991) In Situ Copper Mining at Santa Cruz. A Project pdate, August 1991: 1031-1034.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, AZ Dept. Mines & Min. Resources Open File Rept. 92-10: 15 (Table 1).
Paydirt (1992) Santa Cruz In Situ Copper Leacng Research ooking Good, february 1992: 3B (38 ?).
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.
American Mining Manual (1994) Copper Project gets green Light: 7.
Skillings Mining Review (1994) Arizona In Situ Miing Research Project Proceeds, November 26, 1994: 15.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 121.
Southwestern Paydirt (1995) Industry-Government Project has Big Potential, February, 1995: 4A-9A.
Mining Record (1996) Pilot-Scale Test Begins at Santa Cruz In Situ Project: 107(8), February 21, 1996: 4.
MRDS database Dep. ID #10097042, MRDS ID #M030493; and Dep. ID #10113316, MAS ID #0040211072; and Dep. ID #10234953, MRDS ID #TC35431, MAS ID #0040210076.
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Map Reference: 32°53'25"N , 111°52'35"W
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Mineral List:7 entries listed. 7 valid minerals.
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