Gaby-Papa Grande

Porphyry copper (Cu-Au) deposit in Azuay, Ecuador

Names and other identifiers

Tract name Colombia-Ecuador Miocene Chaucha (005pCu1005)
Included sites Bella Rica
Site status deposit

Geographic location

Country Ecuador
State or province Azuay
Geographic location -79.683333333, -3.05
Geologic map unit -79.683333333, -3.05
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 19Ma
Age determination method unknown
Age range 19.3 ±1 Ma
Age reference Singer and others (2008)
Minerals actinolite, albite, adularia, arsenopyrite, barite, biotite, bornite, carbonate, chalcopyrite, chlorite, electrum, epidote, phlogopite, galena, gold, illite, magnetite, molybdenite, montmorillonite/smectite, palygorskite, pyrite, pyrrhotite, sericite, sphalerite, tennantite, tourmaline
Associated rocks andesite porphyry, breccia, dacite porphyry, feldspar porphyry, quartz diorite porphyry, tonalite porphyry, andesite, basalt, granitoid, metamorphic rocks
Tectonic setting continental margin
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Ag
Tonnage (Mt) 166Mt
Cu grade (%) 0.12%
Mo grade (%) 0.025%
Au grade (g/t) 0.73g/t
Ag grade (g/t) 1.75g/t
Contained copper 200,000t
Gold-Moly ratio 29

Reference information

Comments Best reported interval: 0.38% Cu, 3.9 g/t Au, 0.04% Mo. Cut-off grade 0.5 g/t Au. Exposed.
Study area name Andes
References Anonymous (1994a); Gemuts and others (1992); International Mineral Corp. (2007); Lowell and Quevedo (2002); PRODEMINCA (2000a); PRODEMINCA (2000b); Singer and others (2008)
Site reference Cunningham and others (2008)
Anonymous, 1994c, Ecuadorian pushes ahead at Gaby: The Northern Miner, September 26, p. 13.
Gemuts, Ilmars; Lopez, Guillermo; and Jimenez, Franklin, 1992, Gold deposits of southern Ecuador: Society of Economic Geologists SEG Newsletter, no. 11, p. 1, 13–16. (Also available at
International Mineral Corp., 2007, Gaby project (Ecuador): International Mineral Corp., 7 p., accessed 2008, at [Web page no longer available.]
Lowell, J.D., and Quevedo, L., 2002, Exploring Jurassic porphyry coppers in the Amazon jungle of Ecuador: 2002 SME Annual Meeting, Phoenix, Ariz., February 25–27, 2002, Preprint 02-116. (Also available at
PRODEMINCA, 2000a, Evaluacion distritos mineros del Ecuador—Depositos porfidicos y epi-mesotermales relacionados con intrusiones de las Cordilleras Occidental y Real: Ministerio de Energia y Minas, Subsecretaria de Minas, Direccion Nacional de Geologia, Proyecto de Desarrolo Minero y Control Ambiental (PRODEMINCA), v. 5, 223 p.
PRODEMINCA, 2000b, Manual de exploracion de depositos metaliferos en el Ecuador: Ministerio de Energia y Minas, Subsecretaria de Minas, Direccion Nacional de Geologia, Proyecto de Desarrolo Minero y Control Ambiental (PRODEMINCA), 100 p.
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