Rio Blanco

Porphyry copper deposit in Piura, Peru

Names and other identifiers

Tract name Peru-Ecuador middle–late Miocene La Granja (005pCu1006)
Site status deposit

Geographic location

Country Peru
State or province Piura
Geographic location -79.308333333, -4.944444444
Geologic map unit -79.308333333, -4.944444444
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 16Ma
Age determination method unknown
Age range 20–12 Ma
Age reference Singer and others (2008)
Minerals alunite, andalusite, chalcocite, chalcopyrite, chlorite, clay minerals, covellite, diaspore, digenite, enargite, goethite, hematite, jarosite, kaolinite, limonite, molybdenite, pyrite, pyrophyllite, rutile, sericite, tourmaline
Associated rocks andesite porphyry, breccia, dacite porphyry, quartz porphyry, gneiss, migmatite, phyllite, quartzite, andesite, granodiorite, phyllite, tonalite
Tectonic setting continental margin
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Ag
Tonnage (Mt) 1,257Mt
Cu grade (%) 0.57%
Mo grade (%) 0.023%
Contained copper 7,200,000t
Gold-Moly ratio -9999

Reference information

Comments 0.4% Cu cut-off grade. In primary sulfide ore: 0.54% Cu, 0.03% Mo, 2.5 g/t Ag. 18 holes indicate narrow resource of enriched copper along Henry Ridge, averaging 1.2% Cu over 1.3 km strike. Exposed.
Study area name Andes
References Anonymous (2006b); Braun and others (2000); Monterrico Metals PLC (2004); Monterrico Metals PLC (2007); Perelló and Jensen (2004); Singer and others (2008)
Site reference Cunningham and others (2008)
Anonymous, 2006b, Rio Blanco takes shape: The Northern Miner, June 2–8, 2006.
Braun, E., Calvo, G., and Riofrio C., 2000, Rio Blanco, a newly discovered porphyry copper deposit in northern Peru—Primer volumen de monografias de yacimientos minerales Peruanos—Historia, exploration y geología: Lima, Instituto de Ingenieros de Minas del Peru, p.197–204.
Monterrico Metals PLC, 2004, Rio Blanco: Monterrico Metals PLC press release, August 9, 2004, accessed 2008, at [Web page no longer available.]
Monterrico Metals PLC, 2007, The Rio Blanco project: Monterrico Metals PLC press release, February 5, 2007, 3 p., accessed 2008, at [Web page no longer available.]
Perelló, J.A., and Jensen, S., 2004, Exploration review—South America—Peru: Society of Economic Geologists SEG Newsletter, no. 58, p. 42–43. (Also available at, 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