1887
Volume 66, Issue 9
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

This paper aims at analysing the application of the gravimetric method in the search for copper ore in the Valley of Curaçá River in northern Bahia, Brazil. The area where this study was carried out is known as Angico Farm, one of the claims of Caraíba S.A., a copper producer in the northern Bahia, Brazil. There are 18 drill holes at the Angico Farm target, drilled in order to investigate the mineralizations in depth. We have obtained information such as geographic coordinates and chemical results from the company in order to test the geophysical response and the correlation with geology. A 3D inverse gravimetric model was generated in order to verify the validity of the method in exploring for copper ore associated with hydrothermally altered mafic and ultramafic. Both mafic/ultramafic rocks and copper ore present high density, therefore the gravity method may not be effective for identification. We have shown, however, that copper ore from the Curaçá Valley presents a fairly good gravity response, and 3D inverse mathematical model pointed out a well‐delimited copper orebody in the regions where drill holes intersect the ore and coincide with the positive gravity anomaly. The ore contents were overlapped on cross‐sections of density extracted from the inverse model and such information helped us to check out the consistency of the gravimetric method in mapping and modelling mineralized bodies associated with mineral occurrence. Additionally, magnetic susceptibility and gammaspectrometric data were acquired along 18 drillcores to investigate their possible correlation with orebodies.

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2018-10-23
2020-08-04
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References

  1. AugustoR.A., MonteiroL.V.S., XavierR.P. and de Souza FilhoC.R.2008. Zonas de alteração hidrotermal e paragênese do minério de cobre do alvo Bacaba, Província Mineral de Caraj_as, PA. Revista Brasileira de Geociências38, 263–277.
    [Google Scholar]
  2. BarbosaJ.1996. O embasamento Arqueano e proterozóico inferior do Estado da Bahia: Barbosa, JSF; Dominguez, JML. Geologia da Bahia: texto explicativo. Salvador. Secretaria de Minas e Energia do Estado da Bahia/SGM, pp. 65–102.
  3. BarbosaJ.S.F.2017. Síntese do conhecimento sobre a evolução geotectônica das rochas metamórficas arqueanas e paleoproterozoicas do embasamento do craton do São Francisco na Bahia. Revista Brasileira de Geociências27, 241–256.
    [Google Scholar]
  4. Del‐Rey SilvaL.J.H.1984. Geologia e controle estrutural do depósito cuprífero, Vale do Curaçá, Bahia, Brasil. Master's thesis, Universidade Federal da Bahia, Salvador.
    [Google Scholar]
  5. DelgadoI.M. and SouzaJ.D.1975. Projeto cobre‐curaçá relatório final, geologia econômica do Distrito cuprífero do Rio Curaçá. CPRM, Brasil, 30v.
    [Google Scholar]
  6. Del‐Rey SilvaL.J.H., OliveiraJ.G. and GallE.G.1996. Implication of the Caraiba deposits structural controls on the emplacement of the cu bearing hypershenites of the Curaçá Valley, Bahia Brazil. Revista Brasileira de Geociências26, 181–196.
    [Google Scholar]
  7. DentithM. and MudgeS.2014. Geophysics for the Mineral Exploration Geoscientist. Cambridge Press.
    [Google Scholar]
  8. DNPM
    DNPM . 2009. Anuário mineral brasileiro. DNPM.
  9. KarnerG. and WattsA.1982. On isostasy atlantic‐type continental margins. Journal of Geophysical Research84, 2923–2948.
    [Google Scholar]
  10. LiY. and OldenburgD.W.1998. 3‐D inversion of gravity data. Geophysics63, 109–119.
    [Google Scholar]
  11. LuizG.S.2013. Geofísica na prospecção mineral: Guia para aplicação . SBGF.
  12. MisiA., TeixeiraJ.B.G. and SáJ.H.2012. Mapa metalogenético digital do Estado da Bahia e principais províncias minerais. CBPM.
  13. MottaA.C.1974. A aplicação da magnetometria e gavimetria, na prospecção de cobre, na região do curaçá, Estado da Bahia, Brasil . PhD thesis. School of Mines‐ Austria.
  14. OliveiraE.P., CarvalhoM.J. and McNaughtonN.J.2004. Evolução do segment norte do orógeno Itabuna‐Salvador‐Curaçá: cronologia da acresção de arcos, colisão continental e escape de terrenos. Geologia USP, Série Científica4, 41–53.
    [Google Scholar]
  15. SabatéP., MarinhoM.M., VidalP. and Caen‐VachetteM.1990. The 2‐Ga peraluminous magmatism of the jacobina‐contendas mirante belts (Bahia, Brazil): geologic and isotopic constraints on the sources. Chemical Geology83, 325–338.
    [Google Scholar]
  16. SampaioA., RochaA., SantosR. and GuimarãesJ.2001. Jacobina, folha SC.24‐Y‐C: Estado da bahia.cd‐rom, escala 1:25000 . DNPM.
  17. SantosM.L., LiY. and MoraesR.2015. Application of 3D magnetic amplitude inversion to iron oxide‐copper‐gold deposits at low magnetic latitudes: a case study from Carajás Mineral Province, Brazil. Geophysics80, B13–B22.
    [Google Scholar]
  18. TazavaE.1999. Mineralização de Au‐Cu(±etr‐U) associada às brechas hidrotermais do depósito de Igarapé Bahia, Província mineral de Carjás, PA . PhD thesis. Departamento de Geologia. Escola de Minas, Universidade Federal de Ouro Preto.
  19. TeixeiraJ., SilvaM., LindenmayerZ., SilvaL.D., VasconcelosP., ReisC.et al. 2010. Depósitos de cobre do vale do Rio Curaçá, Bahia. In: Modelos de depósitos de cobre do Brasil e sua resposta ao intemperismo. CPRM.
    [Google Scholar]
  20. TelfordW., GeldardL.P. and SheriffR.E.1990. Applied Geophysics. Cambridge University Press.
    [Google Scholar]
  21. ZucchettiM.2007. Rochas máficas do Supergrupo Grão Pará e sua relação com a mineralização de ferro dos depósitos n4 e n5, Carajás, PA. PhD thesis. Universidade Federal de Minas Gerais.
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  • Article Type: Research Article
Keyword(s): Copper ore , Gammaspectrometry , Gravity and Susceptibility
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