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Aljustrel

Portugal

Main commodities: FeS2 Cu Zn Pb
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The Aljustrel group of volcanic hosted cupriferous massive sulphide pyrite deposits are located within the Iberian Pyrite Belt in southern Portugal, and are similar to those at Rio Tinto in Spain and Neves Corvu, also in Portugal [See the Rio Tinto and Neves Corvu entries for geological setting].   Aljustrel is 50 km NNW of Neves Corvu.

The Aljustrel deposits occur in two separate groups, Estacao and Feitais (which are actually a single massive orebody of more than 100 Mt split by a strike slip fault) and a southern group of Gaviao, Sao Joao, do Deserto, Moinho and Algares.

The orebodies occur at the same stratigraphic level on both normal and reverse limbs of isoclinal folds and are adjacent to a major NE trending fault zone.

They are hosted by the Aljustrel volcanic series, close to the top of the regional lower Carboniferous Volcano-Sedimentary Complex that hosts the deposits of the Iberian Pyrite Belt.

The Aljustrel volcanic ore host rocks are capped by more siliceous phtyllites, silicified felsic tuffs and jaspilitic chert units that may be traced at the surface for several kilometres on strike.   The district has been subjected to nappe style tectonics with a north-east over south-west vergence.

Reserves in 1989 were:

    Pyrite reserves 1989 - 200 Mt @ 0.3 to 0.7% Cu (1.54% Cu at Gaviao), 4.5% Pb+Zn.
    Reserves 2002 - >230 Mt. (Barrie, et al., 2002)

For detail see the reference(s) listed below.

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:
Barrett T J, Dawson G L and MacLean W H,  2008 - Volcanic Stratigraphy, Alteration, and Sea-Floor Setting of the Paleozoic Feitais Massive Sulfide Deposit, Aljustrel, Portugal: in    Econ. Geol.   v103 pp 215-239
Barrie C T, Amelin Y, Pascual E  2002 - U-Pb geochronology of VMS mineralization in the Iberian Pyrite Belt: in    Mineralium Deposita   v37 pp 684-703
Barriga F J A S, Fyfe W S,  1997 - Multi-phase water-rhyolite interaction and ore fluid generation at Aljustrel, Portugal: in    Mineralium Deposita   v33 pp 188-207
Inverno C M C, Solomon M, Barton M D and Foden J,  2008 - The Cu Stockwork and Massive Sulfide Ore of the Feitais Volcanic-Hosted Massive Sulfide Deposit, Aljustrel, Iberian Pyrite Belt, Portugal: A Mineralogical, Fluid Inclusion, and Isotopic Investigation: in    Econ. Geol.   v103 pp 241-267
Leistel J M, Marcoux E, Thieblemont D, Quesada C, Sanchez A, Almodovar G R, Pascual E, Saez R,  1997 - The volcanic-hosted massive sulphide deposits of the Iberian Pyrite Belt. Review and preface to the Thematic Issue: in    Mineralium Deposita   v33 pp 2-30
Pasava J, Vymazalova A and Tornos F,   2007 - PGE distribution in massive sulfide deposits of the Iberian Pyrite Belt : in    Mineralium Deposita   v42 pp 309-314
Sanchez-Espana J, Velasco F, Boyce A J, Fallick A E  2003 - Source and evolution of ore-forming hydrothermal fluids in the northern Iberian Pyrite Belt massive sulphide deposits (SW Spain): evidence from fluid inclusions and stable isotopes: in    Mineralium Deposita   v38 pp 519-537


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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