Porphyry copper (Cu-Mo) deposit in New Mexico, United States

Names and other identifiers

Tract name Southwest Laramide East (003pCu9008)
Included sites Little Rock, Ohio Mine
Site status deposit

Geographic location

Country United States
State or province New Mexico
Geographic location -108.372292898, 32.644006002
Geologic map unit -108.372292898, 32.644006002
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 54Ma
Age determination method Ar-Ar(?)
Age range 56–54 Ma
Age reference McLemore (2008)
Minerals alunite, apatite, azurite/malachite, biotite, brochantite, chalcanthite, chalcocite, chalcopyrite, chlorite, copper, cuprite/tenorite, goethite/limonite, hematite/specularite, kaolinite, libethenite, magnetite, molybdenite, pyrite, sericite, sphalerite, torbernite, turquoise
Associated rocks breccia, dacite porphyry, quartz monzonite porphyry, andesite agglomerate, conglomerate, dacite, granodiorite, quartzite, shale, andesite, diabase dike, granite
Tectonic setting continental margin
Stratigraphic age Paleocene–Eocene

Commodity and development information

Development status Producer
Major commodities Cu
Tonnage (Mt) 1,050Mt
Cu grade (%) 0.49%
Mo grade (%) 0.013%
Au grade (g/t) 0.0015g/t
Ag grade (g/t) 1.3g/t
Contained copper 5,100,000t
Gold-Moly ratio 0.12

Reference information

Comments 30% covered. Two stages of supergene enrichment 19.2–16.2 Ma and 8.7–4.6 Ma.
Study area name United States
References Duhamel and others (1995); Kolessar (1982); Long (1995); North and McLemore (1988); Singer and others (2008); McLemore (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Duhamel, J.E., Cook, S.S., and Kolessar, J., 1995, Geology of the Tyrone porphyry copper deposit, New Mexico, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 464–472.
Kolessar, J., 1982, The Tyrone copper deposit, Grant County, New Mexico, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 327–333.
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.
McLemore, V.T., 2008, Chino mine, Santa Rita district, Grant County, New Mexico, in Mack and others, Geology of the Gila Wilderness-Silver City area: New Mexico Geological Society Fall Field Conference Guidebook 59, p. 41–43.
North, R.M., and McLemore, V.T., 1988, A classification of the precious metal deposits of New Mexico, in Schafer, R.W., Cooper, J.J., and Vikre, P.G., eds., Bulk mineable precious metal deposits of the western United States: Geological Society of Nevada Symposium, Reno, April 6–8, 1987 [Proceedings], p. 625–659.
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/.