Hidalgo, Mexico

Main commodities: Mn
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The Molango district manganese deposit is located on the crest of the Sierra Madre Oriental in Hidalgo State, Mexico.   It is reputed to be the largest known (1992) manganese deposit in North America.

Manganese carbonate mineralisation in the Molango district is hosted by finely laminated upper Jurassic marine sediments over a total stratigraphic thickness of 50 m and a length of 50 km along strike where it serves as a protore for supergene enrichment to Mn oxide ore.   The carbonate ore zone occupies the basal 1 to 10 m of this interval.

The ore zone consists of fine grained rhodochrosite and dispersed organic matter, magnetite, maghemite, with traces of pyrite.   Grades are highest at the base and decrease rapidly upwards.   Ore occurs as stratiform manganese carbonate (rhodochrosite, kutnohorite and Mn calcite) and supergene Mn oxide (pyrolusite, ramsdellite and possibly nsutite) formed from oxidation of the Mn carbonates.   These oxide ores are only known in the southern part of the district.

Measured reserves in 1991 were 3 Mt of Mn, and demonstrated reserves of 200 Mt.   Identified resources are quoted at 1500 Mt @ 10% Mn.

For detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1990.    
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:
Okita P M  1992 - Manganese Carbonate mineralization in the Molango district, Mexico: in    Econ. Geol.   v87 pp 1345-1366

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at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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