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Santa Cruz deposit, Casa Grande area, Casa Grande, Casa Grande Mining District, Pinal County, Arizona, USAi
Regional Level Types
Santa Cruz depositDeposit
Casa Grande areaArea
Casa Grande- not defined -
Casa Grande Mining DistrictMining District
Pinal CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
32° 53' 25'' North , 111° 52' 35'' West
Latitude & Longitude (decimal):
32.89028,-111.87639
GeoHash:
G#: 9tb7n5qpg
GRN:
N22W68
Type:
Deposit
KΓΆppen climate type:
BWh : Hot deserts climate
Nearest Settlements:
PlacePopulationDistance
Stanfield740 (2011)8.0km
Casa Grande51,460 (2017)11.2km
Chuichu269 (2011)17.7km
Vaiva Vo128 (2011)19.7km
Arizona City10,475 (2011)24.3km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Pinal Gem and Mineral SocietyCoolidge, Arizona35km
Mindat Locality ID:
53925
Long-form identifier:
mindat:1:2:53925:9
GUID (UUID V4):
8bab424e-77eb-439c-bccb-cc62c45d97b3
Other/historical names associated with this locality:
Casa Grande Santa Cruz deposit; Francisco Grande deposit; Fanny-Granny deposit; Franny-Granny deposit; Casa Grande; Casa Grande West


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 7ΒΌ 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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


9 valid minerals.

Detailed Mineral List:

β“˜ Atacamite
Formula: Cu2(OH)3Cl
Description: Principal supergene mineral; found in drill cores.
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ Bornite
Formula: Cu5FeS4
β“˜ Chalcocite
Formula: Cu2S
β“˜ Chalcopyrite
Formula: CuFeS2
β“˜ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
β“˜ Covellite
Formula: CuS
β“˜ Molybdenite
Formula: MoS2
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Pyrite
Formula: FeS2

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Chalcocite2.BA.05Cu2S
β“˜Bornite2.BA.15Cu5FeS4
β“˜Covellite2.CA.05aCuS
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Molybdenite2.EA.30MoS2
β“˜Pyrite2.EB.05aFeS2
Group 3 - Halides
β“˜Atacamite3.DA.10aCu2(OH)3Cl
Group 9 - Silicates
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 Β· nH2O, x < 1
Unclassified
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
Hβ“˜ AtacamiteCu2(OH)3Cl
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
OOxygen
Oβ“˜ AtacamiteCu2(OH)3Cl
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SSulfur
Sβ“˜ BorniteCu5FeS4
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ ChalcociteCu2S
Sβ“˜ CovelliteCuS
Sβ“˜ MolybdeniteMoS2
Sβ“˜ PyriteFeS2
ClChlorine
Clβ“˜ AtacamiteCu2(OH)3Cl
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ BorniteCu5FeS4
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ PyriteFeS2
CuCopper
Cuβ“˜ AtacamiteCu2(OH)3Cl
Cuβ“˜ BorniteCu5FeS4
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ ChalcociteCu2S
Cuβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuβ“˜ CovelliteCuS
MoMolybdenum
Moβ“˜ MolybdeniteMoS2

Other Databases

Link to USGS MRDS:10097042

Other Regions, Features and Areas containing this locality

Mexico
North America
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

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.
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.
Singer, Donald A., Berger, Vladimir Iosifovich, Moring, Barry C. (2005) Porphyry copper deposits of the world: database, map, and grade and tonnage models. Open-File Report 2005-1060. US Geological Survey doi:10.3133/ofr20051060
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