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.
This study aims to verify the application of aerial gammaray spectometry to localize mafic ultramafic rocks. The data are collected over Angico's farm, Curaçá County, northern Bahia, Brazil. The region is largely known as copper ore producer from Curaçá's Valley, and by Delgado and Souza (1975) presents numerous mafic and ultramafic rock placed along the the valley. We have observed that the identification is possible only over areas where the underground bodies are relatively shallow and have reasonable dimensions.
This paper proposes to analyze the application of the gravimetric method in copper ore prospecting in the Valley of Curaçá River in northern Bahia, Brazil. Was generated 3D inverse gravimetric model in order to verify the validity of the method in copper ore mining associated with mafic and ultramafic rocks. The inverse mathematical model was generated through the automatic iterative method with setting limits . Finally , ore levels earned in drill core were faced with vertical profiles of the inverse model in order to verify the applicability and consistency of the gravimetric method in mapping and modeling bodies associated with mineral occurrence.
Daniel Conceição dos Santos* (IGEO/UFBA), Marcos Alberto Rodrigues Vasconcelos (IGEO/UFBA), Robson Santos da Purificação (IGEO/UFBA) e Florivaldo Oliveira Sena (SERVIGEO).
This study aims to correlate magnetic susceptibility and gammaspectrometry data to copper mineralization. Measurements have been made in 18 drill cores from Lagoa da Mina and Cercado Velho targets, located in northern Bahia. They comprise a total of 2451.96 meters of material with 6 cm diameter. The results of the analysis are shown as geophysical profiles comparing lithology mineralization content and physical property measurement and through statistical analysis.The Pearson coefficient for each hole indicating was estimated in order to observe whether there is a correlation between copper and physical properties for each profile.
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