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Geophysical investi...
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Dias, PedroLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
Geophysical investigation of the down-dip extension of the Lombador massive sulphide deposit, Neves-Corvo, Portugal
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-03-02
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Springer Nature,2021
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-446636
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446636URI
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https://doi.org/10.1007/s00531-021-01998-xDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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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 Formation 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/cm(3), whereas stockwork and massive sulphide reach on average 3.1 g/cm(3) and 4.5 g/cm(3), 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 confirm the presence and amount of stockwork mineralization down-dip the Lombador deposit inside the Neves-Formation or the Phyllite-Quartzite basement.
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Added entries (persons, corporate bodies, meetings, titles ...)
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Thunehed, HansGeovista AB, Nygatan 10A, S-97233 Luleå, Sweden.
(author)
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Represas, PatriciaLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
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Carvalho, JoaoLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
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Inverno, CarlosLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
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Spicer, BillLundin Min Corp, 150 King St W, Toronto, ON M5H 1J9, Canada.
(author)
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Ramalho, ElsaLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
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Donoso, George A.Uppsala universitet,Geofysik(Swepub:uu)jordo607
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Araujo, VitorMina Neves Corvo Santa Barbara de Padroes, Somincor, Apartado 12, P-7780409 Castro Verde, Portugal.
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Marques, FabioLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
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Morais, IgorLab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.
(author)
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Malehmir, Alireza,1977-Uppsala universitet,Geofysik(Swepub:uu)almle363
(author)
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Pacheco, NelsonMina Neves Corvo Santa Barbara de Padroes, Somincor, Apartado 12, P-7780409 Castro Verde, Portugal.
(author)
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Lab Nacl Energia & Geol, Apartado 7586 Alfragide, P-2610999 Amadora, Portugal.Geovista AB, Nygatan 10A, S-97233 Luleå, Sweden.
(creator_code:org_t)
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In:International journal of earth sciences: Springer Nature110:3, s. 911-9221437-32541437-3262
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Dias, Pedro
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Thunehed, Hans
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Represas, Patric ...
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Carvalho, Joao
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Inverno, Carlos
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Spicer, Bill
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Ramalho, Elsa
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Donoso, George A ...
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Pacheco, Nelson
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