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Pena Colorada, El Mamey

Colima, Mexico

Main commodities: Fe
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In 1970 the Pena Colorada / El Mamey deposits in Colima, Mexico were the largest known iron deposit in the country.   The orebodies were massive hematite-magnetite associated with a 68 Ma equigranular intrusive diorite and limestone of the mid-Cretaceous volcano-sedimentary sequence with tholeiitic volcanics.   The deposits were believed to have the form of magmatic segregations and contact metamorphic (skarn) deposits, with associated detrital accumulations derived from the primary mineralisation (Klemic, 1970).

The dioritic intrusive is surrounded by a 500 m wide alteration halo, including an inner 200 m affected by an earlier metamorphic event with discontinuous bands of pyroxene hornfels and garnet disseminations which are over printed by albitisation and in turn by fracture controlled epidote-chlorite and epidote-chlorite-prehnite.   These were overprinted by a potassic alteration event associated with hydrothermal breccia and aplite dykes and overprints the earlier calcsilicates.   Massive magnetite was deposited contemporaneously with metasomatic plagioclase, forming a shallow dipping 35 m thick replacement body some 200 m above the diorite contact.

Resource figures include:
 131 Mt @ 56% Fe (Reserve, 1961, Klemic, 1970).
 150 Mt @ 36% Magnetite (Resource, 2000, Zurcher, 2001).

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 2001.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Zurcher L, Ruiz J, Barton M D  2001 - Paragenesis, elemental distribution, and stable isotopes at the Pena Colorada Iron Skarn, Colima, Mexico: in    Econ. Geol.   v96 pp 535-557


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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