Washington

Porphyry copper prospect in Sonora, Mexico

Names and other identifiers

GMRAP ID 3050
Alternate names Huepac/Washington, Fortuna, Huepac, Sonorense
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status prospect

Geographic location

Country Mexico
State or province Sonora
Geographic location -110.067797514, 29.895010855
Geologic map unit -110.067797514, 29.895010855
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 45.7Ma
Age determination method K-Ar sericite
Age range 45.7 Ma (K-Ar sericite); 56.4 ±1.2 Ma (K-Ar biotite)
Age reference unknown
Associated rocks trachyte, andesite, latite, shale, limestone
Tectonic setting continental margin
Stratigraphic age Eocene

Commodity and development information

Development status Occurrence
Major commodities Cu, Mo, W
Minor commodities Ag, Au
Trace commodities Zn, Pb
Gold-Moly ratio -9999

Reference information

Comments Oval-shaped deposit, vertically plunging collapse breccia ~60 m in diameter. NNW trending faults form contacts at the surface and crosscut breccia at depth. Plunge of orebody changes to ~60 SW at 200 m depth.Total Resources (1985): 1.2 Mt ore, 1.8% Cu, 0.106% Mo, 0.14% WO3, 15.8 g/t Ag, 0.172 g/t Au. Alteration: argillization-sericitization; phyllic, potassic, local silicification and tourmalinization.
Study area name Mexico
References Simmons and Sawkins (1983); Valencia-Moreno and others (2006); U.S. Geological Survey (2007); Scherkenbach and others (1985)
Site reference Hammarstrom and others (2010)