Porphyry copper prospect in Sonora, Mexico

Names and other identifiers

Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Group name Aurora
Included sites Aurora/Huerta, Labra/Cieneguita(?), Ventura(?)
Site status prospect

Geographic location

Country Mexico
State or province Sonora
Geographic location -109.621391469, 28.526608387
Geologic map unit -109.621391469, 28.526608387
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 53Ma
Age determination method unknown
Age range 54.5 ±1.8 Ma, 52.4 ±1.6 Ma; 59 Ma
Age reference U.S. Geological Survey (2007)
Associated rocks granite-granodiorite
Tectonic setting continental margin
Stratigraphic age Paleocene–Eocene

Commodity and development information

Development status Occurrence
Major commodities Cu, Mo, Au
Gold-Moly ratio -9999

Reference information

Comments Copper along E-W trending breccia zone, in zone of mapped alteration (oxidation, silicification). Sulfides (tetrahedrite) in vein systems. Gold discovered as placer and vein deposits in 1889. Aurora is along the SE contact of a 5-km body of KsTpaGr-Gd that also hosts the Labra Au prospect. 59 Ma (whole rock) age on granodiorite from same pluton. Note high profile cluster of porphyry copper prospects in this area (Aurora, Cuatro Hermanos, Monica, Rio Chico, Cerro Verde (a project name). Alteration: hydrothermal alteration (quartz, sericite, tourmaline) and propylitic alteration.
Study area name Mexico
References García-Cortez and others (2000); Panczner (1987); Pérez-Segura (1985); U.S. Geological Survey (2007)
Site reference Hammarstrom and others (2010)
García-Cortez, J.A., Guzmán-Espinoza, J.B., Mancillas-Gutiérrez, A.A., García-Duarte, Rodolfo, and Siqueiros-López, Christian, 2000, Carta geológico-minera, Tecoripa H12-12, Sonora and Chihuahua [Mexico]: Pachuca, Hidalgo, Servicio Geológico Mexicano, 1 sheet, scale 1:250,000.
Panczner, William D., 1987, Minerals of Mexico: New York, Van Nostrand Reinhold Co., 459 p.
Pérez-Segura, E., 1985, Carta Metalogenética de Sonora 1:250,000—Una interpretación de la metalogenia de Sonora: Gobierno del Estado de Sonora Publicación 7, 64 p.
U.S. Geological Survey, 2007, Mineral Resources Data System (MRDS): U.S. Geological Survey database, accessed December 15, 2007, at