Ely

Porphyry copper deposit in Nevada, United States

Names and other identifiers

GMRAP ID 42
Alternate names Robinson, Ruth
Tract name Sierran Arc (003pCu9007)
Site status deposit

Geographic location

Country United States
State or province Nevada
Geographic location -114.999444444, 39.26
Geologic map unit -114.999444444, 39.26
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 110Ma
Age determination method unknown
Age range 111–109 Ma
Age reference Singer and others (2008)
Minerals actinolite, alunite, andalusite, apatite, biotite, chalcocite, chalcopyrite, chlorite, covellite, diopside, epidote, fluorite, goethite, garnet, hematite/specularite, jarosite, kaolinite, magnetite, molybdenite, montmorillonite, pyrite, pyrrhotite, scheelite, sericite, siderite, sphalerite, tremolite, wollastonite, zeolite, zunyite
Associated rocks breccia, hornfels, jasperoid, quartz monzonite porphyry, skarn, dolomite, granodiorite porphyry, limestone, marble, monzonite porphyry, quartz latite, rhyolite, sandstone, shale, siltstone, tuff
Tectonic setting mixed
Stratigraphic age Early Cretaceous

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 754Mt
Cu grade (%) 0.613%
Mo grade (%) 0.01%
Au grade (g/t) 0.27g/t
Ag grade (g/t) 0.8g/t
Contained copper 4,620,000t
Gold-Moly ratio 30

Reference information

Study area name United States
References Bauer and others (1966); Einaudi (1982); James (1976); James (1990); Long (1995); McDowell and Kulp (1967); Maher (1996); Seedorff (1993); Shaver and Jeanne (1996); Westra (1979); Wilson (1978); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Bauer, H.L., Jr., Breitrick, R.A., Cooper, J.J., and Anderson, J.A., 1966, Porphyry copper deposits in the Robinson mining district, Nevada, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 233–244.
Einaudi, M.T., 1982, Description of skarns associated with porphyry copper plutons, southwestern North America, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 139–183.
James, L.P., 1976, Zoned alteration in limestone at porphyry copper deposits, Ely, Nevada: Economic Geology, v. 71, p. 488–512. (Also available at http://dx.doi.org/10.2113/gsecongeo.71.2.488.)James, L.P., 1990, Gold in the Ely (Robinson) copper district, White Pine County, Nevada, in Shaw, D.R., and Ashley, R.P., Gold in porphyry copper systems: U.S. Geological Survey Bulletin 1857–E, p. E28–E42. (Also available at http://pubs.usgs.gov/bul/1857e/report.pdf.)
Long, K.R., 1995, Production and reserves of Cordilleran (Alaska to Chile) porphyry copper deposits, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 35–68.
Maher, David, 1996, Stratigraphy, structure, and alteration of igneous and carbonate wall rocks at Veteran Extension in the Robinson (Ely) porphyry copper district, Nevada, in Coyner, A.R., and Fahey, P.L., eds., Geology and ore deposits of the American Cordillera: Geological Society of Nevada Symposium, Reno/Sparks, Nev., April 10–13, 1995 [Proceedings], v. 3, p. 1595–1621.
McDowell, F.W., and Kulp, J.L., 1967, Age of intrusion and ore deposition in the Robinson mining district of Nevada: Economic Geology, v. 62, p. 905–909. (Also available at http://dx.doi.org/10.2113/gsecongeo.62.7.905.)
Seedorff, Eric, 1993, Robinson mining district geology and mineralization, summer field trip: Reno, Geological Society of Nevada Special Publication 17, 69 p.
Shaver, S.A., and Jeanne, R.A., 1996, The geology and evolution of the weakly Au-(Cu)-mineralized far eastern side of the Robinson mining district, Ely, Nevada, in Coyner, A.R., and Fahey, P.L., eds., Geology and ore deposits of the American Cordillera: Geological Society of Nevada Symposium, Reno/Sparks, Nev., April 10–13, 1995 [Proceedings], v. 3, p. 1623–1637.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.
Westra, G., 1979, Porphyry copper genesis at Ely, Nevada, in Ridge, J.D., ed., Papers on mineral deposits of Western North America, International Association on the Genesis of Ore Deposits (IAGOD) Quadrennial Symposium, 5th, Snowbird, Utah, 1978, Proceedings, v.2: Nevada Bureau of Mines and Geology Report 33, p. 127–140.
Wilson, W.R., 1978, Geology of the Robinson mining district, in Shawe, D.R., ed., Guidebook to mineral deposits of the central Great Basin: Nevada Bureau of Mines and Geology Report 32, p. 55–61.