Masa Valverde


Main commodities: Cu Au Zr Ag Pb
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Masa Valverde is a blind, volcanic-hosted massive sulphide deposit in the Rio Tinto district of the Iberian Pyrite Belt (IPB) in Spain, approximately 20 km south of La Zarza.

The deposit is more than 1 km long and is located at depths of between 400 and 850 m below the surface, concealed beneath Culm sedimentary rocks which overlie the western extension of a Hercynian age anticline, a few kilometres west of an area where older massive sulphide workings existed.

The Masa Valverde deposit is composed of two main ore bodies composed dominantly of massive and banded pyrite which are hosted by a volcano-sedimentary sequence made up of felsic tuffs interlayered with shale, siliceous exhalite and radiolarian chert and is characterised by the abundance of sedimentary rocks hosting the deposit.

The upper massive sulphide orebody varies from a few to 70 metres, and consists of lenses and blankets of massive sulphides with interbedded tuff and shale and occasionally stockwork zones.

The lower orebody is smaller and thinner than the upper.

Two types of stockwork occur beneath the massive sulphide bodies, the more common type consisting of of irregular and anastomosing sulphide veinlets and irregular blebs formed by replacement. The second stockwork with cross-cutting, generally straight-sided, sulphide veins is, by contrast, suggestive of formation by hydraulic fracturing.

Resources are quoted to total:   120 Mt @ 0.5% Cu, 1.3% Zn, 0.6% Pb, 38 g/t Ag, 0.8 g/t Au

The most recent source geological information used to prepare this summary was dated: 2002.    
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:
Ruiz C, Arribas A and Arribas, Jr. A  2002 - Mineralogy and geochemistry of the Masa Valverde blind massive sulphide deposit, Iberian Pyrite Belt (Spain): in    Ore Geology Reviews   v19 pp 1-22

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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