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Geophysical investigation of the down-dip extension of the Lombador massive sulphide deposit, Neves-Corvo, Portugal

2021-03Journal article Open access
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dc.contributor.authorDias, Pedro
dc.contributor.authorThunehed, Hans
dc.contributor.authorRepresas, Patricia
dc.contributor.authorCarvalho, João
dc.contributor.authorInverno, Carlos
dc.contributor.authorSpicer, Bill
dc.contributor.authorRamalho, Elsa
dc.contributor.authorDonoso, George
dc.contributor.authorAraújo, Vítor
dc.contributor.authorMarques, Fábio
dc.contributor.authorMorais, Igor
dc.contributor.authorMALEHMIR, Alireza
dc.contributor.authorPacheco, Nelson
dc.date.accessioned2022-01-06T12:39:17Z
dc.date.available2023-03-01T01:30:18Z
dc.date.issued2021-03
dc.description.abstractABSTRACT: The 150 Mt Lombador massive sulphide deposit is one of the seven known deposits of the Neves-Corvo mine. The deposit dips approximately 30º–35º to the NE and is open down dip, with current exploitation reaching down at 1 km depth. To investigate the possible downwards continuation of the deposit, a 1D constrained inversion of time-domain electromagnetic (TEM) ground loop data was conducted, followed by 3D electromagnetic (EM) forward modeling and a constrained 3D gravimetric inversion over the same area. To perform the EM and gravity modeling/inversion, a 3D geologic model was built using a density database comprising of approximately 300 drill-holes, and an electrical conductivity database with measurements from resistivity surveys and 1D inversion of the TEM data. The EM modeling shows that the Neves Forma tion shales are a regional conductive layer extending down to approximately 1.6 km depth in the Lombador area. This layer, often topped by massive sulphides, has an average density of 2.83 g/cm3 , whereas stockwork and massive sulphide reach on average 3.1 g/cm3 and 4.5 g/cm3 , respectively. The 3D constrained gravity inversion results do not support the hypothesis of the presence of massive sulphides located in the down-dip direction of the Lombador deposit in the immediate vicinity of the known deposit. The lack of spatial resolution of the gravity grid, the study area limited size and the lack of information from within the basement suggest further studies are required to confrm the presence and amount of stockwork mineraliza tion down-dip the Lombador deposit inside the Neves-Formation or the Phyllite-Quartzite basement.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDias et al. 2021, ‘Geophysical investigation of the down-dip extension of the Lombador massive sulphide deposit, Neves-Corvo, Portugal’, International Journal of Earth Sciences, vol. 110, pp. 911–922. doi:10.1007/s00531-021-01998-xpt_PT
dc.identifier.doihttps://doi.org/10.1007/s00531-021-01998-xpt_PT
dc.identifier.eissn1437-3262
dc.identifier.issn1437-3254
dc.identifier.urihttp://hdl.handle.net/10400.9/3675
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationH2020 project Smart Exploration, Grant Nº 775971.pt_PT
dc.relationProject Explora ALT20-03-0145-FEDER-000025.pt_PT
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs00531-021-01998-xpt_PT
dc.subjectNeves-Corvo minept_PT
dc.subject3D electromagnetic forward modelingpt_PT
dc.subject3D gravity inversionpt_PT
dc.subject2D seismic refectionpt_PT
dc.subjectMassive sulphidespt_PT
dc.subjectLombador depositpt_PT
dc.subjectStockwork mineralizationpt_PT
dc.titleGeophysical investigation of the down-dip extension of the Lombador massive sulphide deposit, Neves-Corvo, Portugalpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceKiel, Germanypt_PT
oaire.citation.endPage922pt_PT
oaire.citation.startPage911pt_PT
oaire.citation.titleInternational Journal of Earth Sciencespt_PT
oaire.citation.volume110pt_PT
person.familyNameMACHADO MADUREIRA FONTES REPRESAS
person.familyNameCarvalho
person.familyNameInverno
person.familyNameRamalho
person.familyNameDonoso
person.familyNameMarques
person.familyNameMorais
person.familyNameMALEHMIR
person.familyNamePacheco
person.givenNamePATRÍCIA
person.givenNameJoão
person.givenNameCarlos
person.givenNameElsa
person.givenNameGeorge
person.givenNameFábio
person.givenNameIgor
person.givenNameAlireza
person.givenNameNelson
person.identifierA-8080-2008
person.identifier.ciencia-id901F-FDE9-581F
person.identifier.ciencia-id1D16-E24A-F4E4
person.identifier.ciencia-idC516-4C8B-2F41
person.identifier.ciencia-idB514-EE2B-870D
person.identifier.orcid0000-0002-2987-2836
person.identifier.orcid0000-0003-2227-3918
person.identifier.orcid0000-0002-0806-5330
person.identifier.orcid0000-0002-9268-271X
person.identifier.orcid0000-0002-7087-4163
person.identifier.orcid0000-0002-4278-8348
person.identifier.orcid0000-0001-9806-7139
person.identifier.orcid0000-0003-1241-2988
person.identifier.orcid0000-0002-2109-8006
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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