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Innovative seismic imaging of volcanogenic massive sulfide deposits, Neves-Corvo, Portugal — Part 1: In-mine array

2021-05Journal article Open access
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dc.contributor.authorBrodic, Bojan
dc.contributor.authorMALEHMIR, Alireza
dc.contributor.authorPacheco, Nelson Bruno Monteiro
dc.contributor.authorJuhlin, Christopher
dc.contributor.authorCarvalho, João
dc.contributor.authorDynesius, Lars
dc.contributor.authorVan Den Berg, Jens
dc.contributor.authorde Kunder, Richard
dc.contributor.authorDonoso, George
dc.contributor.authorSjölund, Tord
dc.contributor.authorAraújo, Vítor
dc.date.accessioned2022-01-10T12:30:29Z
dc.date.available2023-05-01T00:30:16Z
dc.date.issued2021-05
dc.description.abstractABSTRACT: To evaluate and upscale the feasibility of using exploration tunnels in an operating mine for active-source seismic imaging, a seismic experiment was conducted at the Neves-Corvo mine, in southern Portugal. Four seismic profiles were deployed in exploration drifts approximately 650 m beneath the ground surface, above the world-class Lombador volcanogenic massive sulfide deposit. In addition to the tunnel profiles, two perpendicular surface seismic profiles were deployed above the exploration tunnels. The survey was possible due to a newly developed prototype global positioning system (GPS) time transmitter enabling accurate GPS synchronization of cabled and nodal seismic recorders, below and on the surface. Another innovative acquisition aspect was a 1.65 t broadband, linear synchronous motor (LSM) driven — electric seismic vibrator (e-vib) used as the seismic source along two of the exploration tunnels. We have evaluated the challenges and innovations necessary for active-source tunnel seismic acquisition, characterized by high levels of vibrational noise from the mining activities. In addition, we evaluated the LSM vibrator’s signal and overall seismic-data quality in this hard rock mining environment. Our processing results from the tunnel data and 3D reflection imaging of the Lombador deposit below the exploration tunnels were checked for consistency through constant-velocity 3D ray-tracing traveltime forward modeling. For imaging purposes, 3D Kirchhoff prestack depth and poststack time-migration algorithms were used, with both successfully imaging the targeted deposit. The results obtained show that active-source-seismic imaging using subsurface mining infrastructure of operational mines is possible. However, it requires innovative exploration strategies, a broadband seismic source, an accurate GPS-time system capable of transmitting GPS-time hundreds of meters below the surface, and careful processing. The results obtained open up possibilities for similar studies in different mining or tunneling projects.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBrodic et al. 2021, ‘Innovative seismic imaging of volcanogenic massive sulfide deposits, Neves-Corvo, Portugal. Part 1: In-mine array’, Geophysics, vol. 86, nº 3, pp. B165-B179. doi:10.1190/geo2020-0565.1pt_PT
dc.identifier.doihttps://doi.org/10.1190/geo2020-0565.1pt_PT
dc.identifier.eissn1942-2156
dc.identifier.issn0016-8033
dc.identifier.urihttp://hdl.handle.net/10400.9/3680
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSociety of Exploration Geophysicistspt_PT
dc.relationSmart Exploration project. Smart Exploration has received funding from the European Union’s Horizon 2020 Research and Innovation programme under grant agreement n.º 775971.pt_PT
dc.relation.publisherversionhttps://library.seg.org/doi/10.1190/geo2020-0565.1pt_PT
dc.subjectSeismic imagingpt_PT
dc.subjectVolcanogenic massive sulfide depositspt_PT
dc.subjectNeves-Corvo minept_PT
dc.subjectPortugalpt_PT
dc.titleInnovative seismic imaging of volcanogenic massive sulfide deposits, Neves-Corvo, Portugal — Part 1: In-mine arraypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceHouston, USApt_PT
oaire.citation.endPageB179pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPageB165pt_PT
oaire.citation.titleGeophysicspt_PT
oaire.citation.volume86pt_PT
person.familyNameBrodic
person.familyNameMALEHMIR
person.familyNamePacheco
person.familyNameJuhlin
person.familyNameCarvalho
person.familyNamevan den berg
person.familyNameDonoso
person.givenNameBojan
person.givenNameAlireza
person.givenNameNelson Bruno Monteiro
person.givenNameChristopher
person.givenNameJoão
person.givenNamejens
person.givenNameGeorge
person.identifier.ciencia-id1D16-E24A-F4E4
person.identifier.orcid0000-0003-4694-9847
person.identifier.orcid0000-0003-1241-2988
person.identifier.orcid0000-0002-3478-6991
person.identifier.orcid0000-0003-2776-0846
person.identifier.orcid0000-0003-2227-3918
person.identifier.orcid0000-0002-1925-8859
person.identifier.orcid0000-0002-7087-4163
person.identifier.ridI-4572-2012
person.identifier.scopus-author-id7006496545
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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