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Morenci Mine (Morenci pit; Phelps Dodge Morenci Mine; Morenci-Metcalf), Morenci, Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA
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Latitude: 33°5'26"N
Longitude: 109°21'58"W
 
 
An open pit and underground Cu-Mo-Au-Ag-Pb-Zn-U-Re-REE-Gemstone-Gypsum-Talc/soapstone-garnet mine located in secs. 8, 9, 15, 17 and in the N½ sec. 16, T4S, R29E (Clifton 15 minute topo map), at Morenci, 4.5 miles NW of Clifton. First produced 1942. Owned by Phelps Dodge Corp.

Mineralization is an elliptically shaped ore body in a porphyry copper-molybdenum deposit. The ore zone is 1341.12 meters long, 853.44 meters wide with a depth to top of 76.2 meters and a depth to bottom of 701.04 meters, and a thickness of 259.08 meters, and plunges E. Ore control was NE-trending fisures, veining, and crackling. Ore concentration was complex as progressively more silicic intrusions carried sulfide phases into fractures created by older pulses. Alteration was hydrothermal with kaolinization, sericitization, calc-silicate or pelitic hornfels and skarn.

The district is zoned with a chalcopyrite-rich core surrounded by a pyrite envelope which is surrounded by protore. Ag and Au are more abundant in less altered areas. The greatest Mo concentrations are in granite porphyry, less in Precambrian Granite.

The enrichment blanket ranges from 50 to 1000 feet thick and thickens from W to E. Turquoise found in the oxidized part of the deposit. Massive andradite is found in a skarn deposit at the southwest corner of the large open pit.

Area structures include the NW-trending Copper Mountain Fault, which dsplaces enrichment blanket 200 feet. Also NE-trending fissures may have localized porphyry emplacement.

The workings are 2133.6 meters long and 1219.2 meters wide. The open pit work started in 1937. Molybdenite runs 400 to 2000 ppm of Re.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Acanthite
Actinolite
Akaganeite
Allophane
Alunite
Andradite
Anilite
Antlerite
'Apatite'
Aurorite
Azurite
'Biotite'
Bornite
Brochantite
Calcite
Chalcanthite
Chalcocite
Chalcopyrite
'Chlorite Group'
Chrysocolla
Copper
Coronadite
Covellite
Cryptomelane
Cuprite
Cyanotrichite
Diadochite
Digenite
Diopside
Dioptase
Djurleite
Epidote
Galena
Goethite
Gold
Gypsum
Hausmannite
Hematite
Hollandite
Idaite
Jarosite
Kaolinite
Libethenite
'Limonite'
Magnetite
Malachite
Melanterite
Mimetite
Molybdenite
Montmorillonite
Muscovite
var: Sericite

Neotocite
Nontronite
Olivenite
Opal
Orthoclase
Pyrite
Pyrrhotite
Quartz
Rutile
'Serpentine Group'
Siderite
Sphalerite
Stibnite
Stromeyerite
Talc
Tenorite
Titanite
Todorokite
Torbernite
Tremolite
Tsumebite
Turquoise
Wollastonite
Wulfenite


76 entries listed. 69 valid minerals.

Localities in this Region

USA
  • Arizona
    • Greenlee Co.
      • Shannon Mts
        • Copper Mountain District (Clifton-Morenci District)

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References

Lindgren, W. (1903), The copper deposits of Clifton, Arizona, Engineering and Mining Journal: 75: 705.

Lindgren, W. (1904), The genesis of copper deposits, Engineering and Mining Journal: 78: 987.

Lindgren, W. (1905), The copper deposits of the Clifton-Morenci district, Arizona, USGS PP 43;

Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.

University of Arizona Bull. 41 (1916-17), Mineralogy of Useful Minerals in Arizona: 50.

Butler, B.S. & Wilson E.D. (1938), Arizona Bureau of Mines Bull. 145: 72-80.

Moolick, R.T. & J.J. Durek (1966), The Morenci district, in S.R. Titley and C.L. Hicks (editors), Geology of the porphyry copper deposits, southwestern North America, Universty of Arizona Press, Tucson: 221-231.

Langton, J.M. (1973), Ore Genesis in the Morenci-Metcalf District, A.I.M.E. Transactions: 254: 247-257.

Paydirt (1981) Phelps Dodge, A Copper Centennial, 1881-1981.

Engineering and Mining Journal (1987) Phelps Dodge Has Something to Smile About, August, 1987: 24-31.

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

Minerals Yearbook (1988) - Mining & Quarrying Trends: 31;

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

Phillips, et al (1990).

Walenga, Karen (1990) SX-EW Production Doubled to 200 Million PPY, Southwestern Pay Dirt, 4/90: 4A-6A.

Dillard, Gary (1991) Four Major Orebodies will Shoulder the Load. Southwestern Pay Dirt, 11/91: 4A-14A.

Epler, Bill (1991) Phelps Dodge Finds 150 Million More Tons of Ore at Morenci. Southwestern Pay Dirt, 1/91: 3A.

Epler, Bill (1991) Phelps Dodge Relocates Highway at Morenci Mine. Southwestern Pay Dirt, 7/91: 4A-6A.

Blair, G. (1992), The Rockhound's Guide to Arizona: Helena, MT, Falcon Press.

Carter, Russell A. (1992) Expansion Almost Complete at Arizona’s Mission and Morenci Mines. Engineering and Mining Journal, 2/92: C14-C16.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 8 (Table 1).

Dillard, Gary (1994) Phelps Dodge is Contemplating SX-EW Expansion at Morenci. Southwestern Pay Dirt, 5/94: 3A, 8A.

Snider, T.R. (1994) Morenci Southside will Add 150 million pounds of Cathode. Southwestern Pay Dirt, 8/94: 3A.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 124, 125, 163, 166, 193, 198, 233, 261, 292, 314, 345, 368, 388.

Merritt Stephen Enders (2000) The Evolution of Supergene Enrichment in the Morenci Porphyry Copper Deposit, Greenlee County, Arizona. PhD Thesis, University of Arizona

Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.

Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 1.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027138, MRDS ID M002216; and file ID #10282444.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0040110018.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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