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Aznalcollar

Seville, Sevilla, Spain

Main commodities: Cu Au Zn FeS2 Pb Ag
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The Aznalcollar pyrite mine is located within the Sevilla Province and belongs to the Pyrite Belt of southern Spain.   In 1990 it had reserves of 43 Mt of massive pyrite grading 0.44% Cu, 1.74% Pb, 3.33% Zn, 67 g/t Ag, 1 g/t Au.   Also outlined was a reserve of cupriferous pyroclastics amounting to 47 mt @ 0.58% Cu, 0.40% Zn, 10 g/t Ag.

The mineralised zone extends over a NE trending strike length of 1750 m, including the old mines of Santiago, Panaleta, Cuchichon, Masa Nueva, Silillos & Higuereta.

The deposit lies within the Lower Carboniferous Volcanic-Sedimentary Complex composed of marine volcanic rocks with intercalated slates, quartzites, sandstones and limestones. These units are overlain by the Carboniferous Culm formation of slates and greywackes. The basement is an apparently conformably underlying succession of Upper Devonian slates, quartzites, sandstone, limestone and conglomerate.

The immediate host sequence includes rhyolites, felsite, pyroclastics, altered clayey pyroclastics, graphitic black shale and the massive pyrite.   The tabular massive pyrite body is up to 100 m in thickness.

The most recent source geological information used to prepare this summary was dated: 1989.    
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:
Almodovar G R, Saez R, Pons J M, Maestre A, Toscano M, Pascual E,  1997 - Geology and genesis of the Aznalcollar massive sulphide deposits, Iberian Pyrite Belt, Spain: in    Mineralium Deposita   v33 pp 111-136
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
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
Soriano C, Marti J  1999 - Facies analysis of volcano-sedimentary successions hosting massive sulfide deposits in the Iberian Pyrite belt, Spain: in    Econ. Geol.   v94 pp 867-882
Tornos F,  2006 - Environment of formation and styles of volcanogenic massive sulfides: The Iberian Pyrite Belt: in    Ore Geology Reviews   v28 pp 259-307
Vazquez Guzman F  1989 - Spain (Extracts): in Dunning F W, Garrard P, Haslam H W, Ixer R A (Eds.),  Mineral Deposits of Europe IMM, London   v 4/5: Southwest and Eastern Europe, with Iceland pp 105-127, 194-196


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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