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A drill‑hole, geological and geophysical data‑based 3D model for target generation in Neves‑Corvo mine region, Portugal

2021-10Journal article Open access
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dc.contributor.authorCarvalho, João
dc.contributor.authorDias, Pedro
dc.contributor.authorRevaux, Charles
dc.contributor.authorMatos, João Xavier
dc.contributor.authorAraújo, Vítor
dc.contributor.authorInverno, Carlos
dc.contributor.authorMarques, Fábio
dc.contributor.authorDonoso, George
dc.contributor.authorPacheco, Nelson
dc.contributor.authorMorais, Igor
dc.contributor.authorAlbardeiro, Luis
dc.contributor.authorBatista, Maria Joao
dc.contributor.authorMALEHMIR, Alireza
dc.contributor.authorSpicer, Bill
dc.contributor.authorde Oliveira, Daniel Pipa Soares
dc.date.accessioned2022-01-19T15:36:14Z
dc.date.available2023-10-01T00:30:32Z
dc.date.issued2021-10
dc.description.abstractABSTRACT: The Neves-Corvo world class Iberian Pyrite Belt volcanogenic massive sulphide (VMS) deposit located in southern Portugal, constitutes an important Cu–Zn–Pb active mine. Seven deposits are currently known, among which the Lombador deposit alone has estimated 150 Mt of massive sulphides. The life-time of the mine is dependent on the discovery of new exploration targets and it is vital to have accurate 3D geological models, not only to guide drilling campaigns but also to drive a winning/ new strategy, which in the past has led to Semblana and Monte Branco discoveries: geophysical inversion and modelling. Furthermore, 3D geological models can contribute to the understanding of the tectonic and stratigraphic evolution of the region. Therefore, the goal of this study is to produce a realistic 3D geological model of the Neves-Corvo region, as only one model is presently publicly available: the PROMINE model, which includes the study area of this work and extends from Aljustrel to the border with Spain. Lundin Mining has also produced two unpublished, confdential models in 2007 and 2017. The latest Lundin model incorporates the same geophysical data used in this work (2D and 3D seismic refection and time-domain electromagnetic (TEM) ground loop data) and approximately 7500 surface and underground drill-holes. The model presented in this research has much more detail than the 2012 PROMINE model in the Neves-Corvo region and uses an updated and revised drill-hole database with approximately 8000 drill-holes, revised geological cross-sections built from surface geology and drill-hole logs, new geological outcrop data, petrophysical and reprocessed geophysical data, and is therefore more detailed and accurate than any of the previous models, in particular the 2007 and PROMINE models. Land gravimetric and aeromagnetic data are also available in the study area but were not directly used to build the geological model but rather to investigate and check the model produced. Modelling was performed with industry standard software and the 3D curves resulting from the geological/geophysical interpretation were interpolated using diferent approaches to respect the hard data (interpretation lines and drill-holes). The resulting 3D stratigraphic surfaces required strong manual editing to respect the interpretation, due to the presence of folds, thrusts and tectonic nappes in the study area. The surfaces were afterwards tied to the drill-holes, resulting in a 3D model with great accuracy and detail in the near mining area and covering a larger area than previously available 3D geological models. The model has three major stratigraphic layers: the Mértola Flysch Formation and the Volcano-Sedimentary Complex (VSC), overlying the Phyllite-Quartzite Formation basement, and also the known VMS deposits (underlying the top of the Lower VSC) geometries according to drill-hole data. In the central part of the study area, where more drill-holes are available, the top of the Lower VSC sequence surface was also built. This approach will contribute to a better exploration drill-hole planning and the generation of new targets for exploration.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarvalho et al. 2021, ‘A drill-hole, geological and geophysical data-based 3D model for target generation in Neves-Corvo mine region, Portugal’, International Journal of Earth Sciences. doi:10.1007/s00531-021-02120-xpt_PT
dc.identifier.doihttps://doi.org/10.1007/s00531-021-02120-xpt_PT
dc.identifier.eissn1437-3262
dc.identifier.issn1437-3254
dc.identifier.urihttp://hdl.handle.net/10400.9/3708
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationSmart Exploration (European Union’s Horizon 2020 programme grant agreement N.º 75971).pt_PT
dc.relationEXPLORA (ALT20-03-0145-FEDER-000025) projects.pt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs00531-021-02120-xpt_PT
dc.subject3D geological modellingpt_PT
dc.subjectNeves-Corvo minept_PT
dc.subjectDrill-holespt_PT
dc.subjectTime-domain electromagnetic datapt_PT
dc.subjectSeismic refection datapt_PT
dc.subjectBouguer anomalypt_PT
dc.subjectTotal-feld magnetic intensitypt_PT
dc.titleA drill‑hole, geological and geophysical data‑based 3D model for target generation in Neves‑Corvo mine region, Portugalpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceHamburg, Germanypt_PT
oaire.citation.titleInternational Journal of Earth Sciencespt_PT
person.familyNameCarvalho
person.familyNameXavier Matos
person.familyNameInverno
person.familyNameMarques
person.familyNameDonoso
person.familyNamePacheco
person.familyNameMorais
person.familyNameAlbardeiro
person.familyNameBatista
person.familyNameMALEHMIR
person.familyNamede Oliveira
person.givenNameJoão
person.givenNameJoão Manuel
person.givenNameCarlos
person.givenNameFábio
person.givenNameGeorge
person.givenNameNelson
person.givenNameIgor
person.givenNameLuís
person.givenNameMaria Joao
person.givenNameAlireza
person.givenNameDaniel Pipa Soares
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person.identifier.orcid0000-0002-6338-8845
person.identifier.ridAGY-5000-2022
person.identifier.scopus-author-id7005481948
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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