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Cerro Verde, San Isidro, Mun. de La Huacana, Michoacan, Mexico

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Latitude & Longitude (WGS84): 19° 0' 7'' North , 101° 56' 55'' West
Latitude & Longitude (decimal): 19.0019444444, -101.948611111
Porphyry Cu related mineralization comprised of small breccias and dissemination of sulphides in a weakly altered granodiorite to quartz-sericite. Hypogene minerals such as pyrite and chalcopyrite are common at shallow depth of less then 10 meters. Zones of sporadically developed copper oxides occur on surface with minerals such as Tenorite spotting or ill-formed dendrite. Other secondary minerals are noted in a narrow fault zone outcropping on the side of the hill. Small cavities, generally associated with fractures contained primarily olivenite crystals to 3 mm forming a nice dark green carpet. Noted with the olivenite are micro blue clinoclase which can sit on the limonitic matrix or directly associated with the olivenite.

In January 1994, approximately 50 specimens of the olivenite material were collected (only 6 other occurrences in Mexico) with 4 of these having the associated clinoclase (first mention from Mexico). The presence of clinoclase was confirmed by Raman spectroscopy in July 2011 by Marcus Origlieri at the University of Arizona. Olivenite was previously confirmed by Excalibur in October 1999 and re-confirmed by Origlieri in 2011.

No historical mine workings are noted in the area.

Mineral List

5 entries listed. 5 valid minerals.

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Site visit by J des Rivieres in 1994-95

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