La Fortuna

Porphyry copper (Cu-Au) deposit in Atacama, Chile

Names and other identifiers

GMRAP ID 306
Alternate names El Morro, El Moro
Tract name Chile-Argentina Eocene–Oligocene La Fortuna (005pCu1012)
Site status deposit

Geographic location

Country Chile
State or province Atacama
Geographic location -69.883333333, -28.633333333
Geologic map unit -69.883333333, -28.633333333
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 33.5Ma
Age determination method unknown
Age range 35–32 Ma
Age reference Singer and others (2008)
Minerals alunite, anhydrite, bornite, chalcocite, chalcopyrite, chlorite, chrysocolla, covellite, diaspore, dickite, goethite, hematite, jarosite, kaolinite/illite, limonite, malachite, molybdenite, pyrite, pyrophyllite, sericite, smectite, tennantite, tourmaline, turquoise, zunyite
Associated rocks breccia, dacite porphyry, quartz diorite porphyry, rhyolite porphyry,basalt, dacite, diorite, rhyolite, tuff,andesite, conglomerate, dacitic ignimbrite, sandstone
Tectonic setting continental margin
Stratigraphic age Eocene–Oligocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 1,245Mt
Cu grade (%) 0.41%
Au grade (g/t) 0.35g/t
Contained copper 5,104,500t
Gold-Moly ratio -9999

Reference information

Comments Total resource at 0.2% Cu cut-off; ?0.02 to 0.03% Mo, 1.0 to 12 g/t Ag. 70% of the deposit area covered by alluvium and gravel.
Study area name Andes
References Anonymous (2001c); Metallic Resources Inc. (2006a); Metallic Resources Inc. (2006b); Noranda Exploration Inc. (2001b); Perelló and others (1994); Perelló and others (1996); Singer and others (2008)
Site reference Cunningham and others (2008)
Anonymous, 2001c, Impressive El Morro intersections: Mining Journal, March, p. 181.
Metallica Resources Inc., 2006a, Advanced exploration – El Moro, Chile: Metallica Resources Inc., 7 p., accessed 2008, at http://www.metal-res.com/s/ElMoro.asp. [Web page no longer available.]
Metallica Resources Inc., 2006b, Doubling of El Moro Resources: Metallica Resources Inc. press release, November 13, 2006, accessed 2008, at http://www.metal-res.com/s/NewsReleases.asp?ReportID=165329&_Type. [Web page no longer available.]
Noranda Exploration Inc., 2001b, September 28, 2001: Noranda Exploration Inc. press release, September 28, 2001, 1 p., accessed 2008, at http://www.noranda.com. [Web page no longer available.]
Perelló, J., Urzúa, F., Cabello, J., and Ortiz, F., 1994, Clustered, gold-bearing Oligocene porphyry copper and associated epithermal mineralization at La Fortuna, Vallenar region, northern Chile: 7th Congresso Geologico Chileno, Actas, v. 2, p. 1607–1612.
Perelló, J., Urzúa, F., Cabello, J., and Ortiz, F., 1996, Clustered, gold-bearing Oligocene porphyry copperand associated epithermal mineralization at La Fortuna, Vallenar region, northern Chile, in Camus, F., Sillitoe, R.H., and Petersen, R., eds.,Andean copper deposits—New discoveries, mineralization, styles and metallogeny: Society of Economic Geologists Special Publication 5, p. 81–90.
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/.