La Sierrita/La Cobriza

Porphyry copper prospect in Sonora, Mexico

Names and other identifiers

Tract name Western Mexican Basin and Range and Laramide Southwest (003pCu3006x)
Site status prospect

Geographic location

Country Mexico
State or province Sonora
Geographic location -111.30287173, 29.395054928
Geologic map unit -111.30287173, 29.395054928
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range ~80–35 Ma(?) (Laramide orogeny(?))
Age reference geologic inference
Tectonic setting continental margin
Stratigraphic age Late Cretaceous–Paleocene–Eocene(?)

Commodity and development information

Development status Occurrence
Major commodities Cu
Gold-Moly ratio -9999

Reference information

Comments La Cobriza and La Sierrita porphyry target (Cu,Zn,W, Mo) are part of Yale Resources 2,620-hectare La Verde Project that cover 6 continuous exploration concessions (Yale Resources Ltd., 2008). Cluster of prospects; near La Verde skarn. Exploration by the Consejo de Recursos Minerales (1992b) showed irregular distribution of skarn; chemistry on chip samples from historic workings: 0.28 to 5.45% Cu, 0.16 to 8.6% Zn, 4.9 to 578 g/t Ag, 0.1 to 11.1 g/t Au.
Study area name Mexico
References Peña-Leal and others (1999); University of Arizona (1999); Yale Resources Ltd. (2008); Servicio Geológico Mexicano (written commun., 2007b); Consejo de Recursos Minerales (1992b)
Site reference Hammarstrom and others (2010)
Consejo de Recursos Minerales, 1992b, Monografía geologico-minera del estado de Sonora: Pachuca, Hildago, Mexico, Consejo de Recursos Minerales, Publicación M8-e, 220 p.
Peña-Leal, J.L., Zamora-Tovar, R.E., Núñez-Othón, Aristeo, and Orantes-Contreras, Vladimir, 1999, Carta geológico-minera, Hermosillo H12-8, Sonora [Mexico]: Pachuca, Hidalgo, Servicio Geológico Mexicano, 1 sheet, scale 1:250,000.
University of Arizona-Industry-USGS Mexico Consortium, 1999, March 1999 release notes: University of Arizona-Industry-USGS Mexico Consortium (unpub. report).
Yale Resources Ltd., 2008, La Verde project: Yale Resources Ltd. Web page accessed December 29, 2008, at