Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Anuário do Instituto de Geociências (Online) |
Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/30053 |
Resumo: | This research was focused on weathering conditions regarding Banded Iron Formations (BIF) ore exploitation at Bonito Mine. The database is stemmed from an exhaustive drilling program at the mining site. Therefore, hundreds of iron ore samples were assayed for Fe2O3, SiO2, Al2O3, P and Mn grades, and qualitative geotechnical data such as weathering grades, physical ore type, voids, and coring depth levels were collected from drilling core samples. A previous petrographic study has shown that there are four BIF types: amphibolitic itabirites, martitic itabirites, hematitic itabirites, and magnetitic itabirites. In order to enhance this study, a multivariate model using geochemical and geotechnical data under a systemic approach was employed. This approach was conceived to account for the whole available information, both quantitative and qualitative, through the Correspondence Analysis and Cluster Analysis grounded appropriate methodology. This innovative strategy disclosed the presence of two groups of samples, denoted in the sequel Cluster 1 and Cluster 2. Cluster 1 is characterized by the Fe-poorer/High-Al BIF ores describing an association of magnetitic itabirites, martitic itabirites to amphibolitic itabirites which are conditioned to depths deeper than 70 meters and they usually stand as slightly weathered rocks or fresh rocks. Cluster 2 encompasses Fe-richer/Low-Al BIF ores composed of martitic, magnetitic and hematitic itabirites which are described as moderate to highly weathered porous friable ore materials. The proposed multivariate modeling strategy can deal with a wide range of miscellaneous geological issues. |
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Anuário do Instituto de Geociências (Online) |
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Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence AnalysisItabirites; multivariate modeling; methodological strategy; weathering grades; Serra dos Quintos FormationThis research was focused on weathering conditions regarding Banded Iron Formations (BIF) ore exploitation at Bonito Mine. The database is stemmed from an exhaustive drilling program at the mining site. Therefore, hundreds of iron ore samples were assayed for Fe2O3, SiO2, Al2O3, P and Mn grades, and qualitative geotechnical data such as weathering grades, physical ore type, voids, and coring depth levels were collected from drilling core samples. A previous petrographic study has shown that there are four BIF types: amphibolitic itabirites, martitic itabirites, hematitic itabirites, and magnetitic itabirites. In order to enhance this study, a multivariate model using geochemical and geotechnical data under a systemic approach was employed. This approach was conceived to account for the whole available information, both quantitative and qualitative, through the Correspondence Analysis and Cluster Analysis grounded appropriate methodology. This innovative strategy disclosed the presence of two groups of samples, denoted in the sequel Cluster 1 and Cluster 2. Cluster 1 is characterized by the Fe-poorer/High-Al BIF ores describing an association of magnetitic itabirites, martitic itabirites to amphibolitic itabirites which are conditioned to depths deeper than 70 meters and they usually stand as slightly weathered rocks or fresh rocks. Cluster 2 encompasses Fe-richer/Low-Al BIF ores composed of martitic, magnetitic and hematitic itabirites which are described as moderate to highly weathered porous friable ore materials. The proposed multivariate modeling strategy can deal with a wide range of miscellaneous geological issues.Universidade Federal do Rio de JaneiroFonteles, Helano Regis da NóbregaPereira, Henrique GarciaVeríssimo, César Ulisses Vieira2019-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/3005310.11137/2019_2_86_99Anuário do Instituto de Geociências; Vol 42, No 2 (2019); 86-99Anuário do Instituto de Geociências; Vol 42, No 2 (2019); 86-991982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJenghttps://revistas.ufrj.br/index.php/aigeo/article/view/30053/16960Copyright (c) 2019 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccess2019-12-10T15:04:16Zoai:www.revistas.ufrj.br:article/30053Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2019-12-10T15:04:16Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
title |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
spellingShingle |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis Fonteles, Helano Regis da Nóbrega Itabirites; multivariate modeling; methodological strategy; weathering grades; Serra dos Quintos Formation |
title_short |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
title_full |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
title_fullStr |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
title_full_unstemmed |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
title_sort |
Weathering Conditions Evaluation of Banded Iron Formations of Bonito Mine (Northeastern Brazil) Based on Coupled Cluster-Correspondence Analysis |
author |
Fonteles, Helano Regis da Nóbrega |
author_facet |
Fonteles, Helano Regis da Nóbrega Pereira, Henrique Garcia Veríssimo, César Ulisses Vieira |
author_role |
author |
author2 |
Pereira, Henrique Garcia Veríssimo, César Ulisses Vieira |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Fonteles, Helano Regis da Nóbrega Pereira, Henrique Garcia Veríssimo, César Ulisses Vieira |
dc.subject.none.fl_str_mv |
|
dc.subject.por.fl_str_mv |
Itabirites; multivariate modeling; methodological strategy; weathering grades; Serra dos Quintos Formation |
topic |
Itabirites; multivariate modeling; methodological strategy; weathering grades; Serra dos Quintos Formation |
description |
This research was focused on weathering conditions regarding Banded Iron Formations (BIF) ore exploitation at Bonito Mine. The database is stemmed from an exhaustive drilling program at the mining site. Therefore, hundreds of iron ore samples were assayed for Fe2O3, SiO2, Al2O3, P and Mn grades, and qualitative geotechnical data such as weathering grades, physical ore type, voids, and coring depth levels were collected from drilling core samples. A previous petrographic study has shown that there are four BIF types: amphibolitic itabirites, martitic itabirites, hematitic itabirites, and magnetitic itabirites. In order to enhance this study, a multivariate model using geochemical and geotechnical data under a systemic approach was employed. This approach was conceived to account for the whole available information, both quantitative and qualitative, through the Correspondence Analysis and Cluster Analysis grounded appropriate methodology. This innovative strategy disclosed the presence of two groups of samples, denoted in the sequel Cluster 1 and Cluster 2. Cluster 1 is characterized by the Fe-poorer/High-Al BIF ores describing an association of magnetitic itabirites, martitic itabirites to amphibolitic itabirites which are conditioned to depths deeper than 70 meters and they usually stand as slightly weathered rocks or fresh rocks. Cluster 2 encompasses Fe-richer/Low-Al BIF ores composed of martitic, magnetitic and hematitic itabirites which are described as moderate to highly weathered porous friable ore materials. The proposed multivariate modeling strategy can deal with a wide range of miscellaneous geological issues. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-12-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/30053 10.11137/2019_2_86_99 |
url |
https://revistas.ufrj.br/index.php/aigeo/article/view/30053 |
identifier_str_mv |
10.11137/2019_2_86_99 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/30053/16960 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2019 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2019 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
dc.source.none.fl_str_mv |
Anuário do Instituto de Geociências; Vol 42, No 2 (2019); 86-99 Anuário do Instituto de Geociências; Vol 42, No 2 (2019); 86-99 1982-3908 0101-9759 reponame:Anuário do Instituto de Geociências (Online) instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
instname_str |
Universidade Federal do Rio de Janeiro (UFRJ) |
instacron_str |
UFRJ |
institution |
UFRJ |
reponame_str |
Anuário do Instituto de Geociências (Online) |
collection |
Anuário do Instituto de Geociências (Online) |
repository.name.fl_str_mv |
Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ) |
repository.mail.fl_str_mv |
anuario@igeo.ufrj.br|| |
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1797053536250363904 |