Santo Tomas

Porphyry copper deposit in Sinaloa, Mexico

Names and other identifiers

GMRAP ID 189
Alternate names Choix//Mazomique (Cerro), Agua Prieta, San Rafael, El Durazno
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country Mexico
State or province Sinaloa
Geographic location -108.23385561, 26.717194424
Geologic map unit -108.23385561, 26.717194424
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 57.2Ma
Age determination method K-Ar biotite
Age range 57.2 ±1.2 Ma
Age reference Damon, Shafiqullah and Clark (1983)
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Tonnage (Mt) 274Mt
Cu grade (%) 0.5%
Au grade (g/t) 0.05g/t
Contained copper 1,400,000t
Gold-Moly ratio -9999

Reference information

Comments Mineralization in quartz monzonite sill(?) that intrudes andesite. Chalcopyrite in fractured quartz monzonite, in hornfelsed andesite, and in disseminations. Marbleized Cretaceous(?) limestone overlies andesite (Clark, 1975). Privately owned. Alteration: potassic, propylitic, calcsilicate.
Study area name Mexico
References Escamilla-Torres and others (2000); Singer and others (2008); Damon, Shafiqullah and Clark (1983); Valencia-Moreno and others (2007)
Site reference Hammarstrom and others (2010)