Amalgamation
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Effective density concentration in refractory gold ore for characterization purposes
Abstract This article evaluates the efficiency, benefits and limitations of pre-concentration by density separation for process mineralogy studies of low-grade gold ore. The pre-concentration by density aims to generate a product with a high content of gold and to maximize the number of gold-bearing particles characterized, thereby increasing the representat
REM, Int. Eng. J.. Publicado em: 2020-12
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2. Estimation of mercury released from an abandoned gold mine in Minas Gerais, Brazil
Abstract Mining is very important to the economic, political and social development of the Minas Gerais State in Brazil ever since the time the country became a Portuguese colony in the early 1500s. However, few researches have been conducted to evaluate the environmental impacts associated with the mining activity at this time. There are many abandoned mine
REM, Int. Eng. J.. Publicado em: 2020-03
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3. Geochemistry, Sm-Nd isotopes and SHRIMP U-Pb geochronology of the Morro do Coco Granite (RJ, Brazil): another piece of the post-collisional magmatism of the Ribeira Belt
Abstract The Morro do Coco granite (MC) is a post-collisional intrusive body that was emplaced at Ribeira Belt, in the Cambro-Ordovician, succeeding the final stages of the Gondwana supercontinent amalgamation. This unit requires more studies, contrasting with similar best investigated occurrences of the central Ribeira Belt. This work presents a detailed in
Braz. J. Geol.. Publicado em: 12/09/2019
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4. Stratigraphy, petrography and tectonics of the manganese-bearing Buritirama Formation, Northern Carajás Domain, Amazon Craton
Abstract The Buritirama Formation (BF) occurs at the extreme north of the Carajás Province, close to the contact with the Bacajá domain, in the southeastern portion of the Amazon Craton (Brazil). The BF consists of a 40 km long, ca. 3 km wide NW-SE trending structure arranged in four imbricated thrusts that individualize three main stratigraphic units. The
Braz. J. Geol.. Publicado em: 15/04/2019
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5. Conservation of geosites as a tool to protect geoheritage: the inventory of Ceará Central Domain, Borborema Province - NE/Brazil
ABSTRACT The Ceará Central Domain, in the northern Borborema Province/NE Brazil, encompasses important geological records (geosites) which allow understanding a relevant period of the Earth’s evolution, mainly associated to Neoproterozoic Brazilian/Pan-African Cycle and West Gondwana amalgamation, besides Neoarchean to Ordovician records. The presented ge
An. Acad. Bras. Ciênc.. Publicado em: 2017-12
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6. Amortização do ágio e imposto sobre a renda: incorporação, fusão e cisão / Goodwill amortization and income tax: amalgamation, merger and spin-off
This is a study that aims to research the legal content that establish the legal relationship of the registry of goodwill on the acquisition of equity on a controlled company, and the possibility to depreciate from income tax calculation basis the goodwill registered on the acquisition, when of the amalgamation of the acquired company due to a merger or spin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2012
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7. Aspectos de ordem institucional para a gestão de resíduos sólidos em áreas metropolitanas: o desafio da intermunicipalidade / Institutional Aspects for Solid Waste Metropolitan Management: Challenge of intermunicipality
A ampliação horizontal das áreas urbanizadas dos municípios leva à formação de um tecido urbano contínuo, definido como conurbação. Essa condição tende a reduzir as possibilidades para o tratamento e disposição final de resíduos sólidos em áreas localizadas a menores distâncias dos centros geradores. Tal condição implica, entre outras que
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2012
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8. Geocronologia da região de Gondola-Nhamatanda (Centro de Moçambique) / não informado
The region of Gondola-Nhamatanda is located at the border between the provinces of Manica and Sofala, central part of Moçambique. It is geologically inserted in the Bárue complex and the Phanerozoic cover. The Bárue complex is composed of the Macossa and Chimoio supracrustal groups intruded by plutonic rocks of various compositions, whereas the Phanerozoi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/01/2012
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9. Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation
Foi desenvolvido um sistema em linha para a especiação de Hg orgânico (Hgorg) e Hg inorgânico (Hginorg) em chorume. Clorocomplexos produzidos a partir do Hginorg são separados em uma coluna trocadora de ânions. O Hg retido na coluna é eluído com NaBH4 na presença de HCl. O Hg0 produzido é medido por espectrometria de absorção atômica com geraç�
Publicado em: 2010
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10. Mitochondrial DNA mapping of social-biological interactions in Brazilian Amazonian African-descendant populations
The formation of the Brazilian Amazonian population has historically involved three main ethnic groups, Amerindian, African and European. This has resulted in genetic investigations having been carried out using classical polymorphisms and molecular markers. To better understand the genetic variability and the micro-evolutionary processes acting in human gro
Publicado em: 2010
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11. Arquitetura estratigráfica e arcabouço estrutural dos depósitos fluviais albianos da base da Formação São Mateus no Norte da Bacia do Espírito Santo
The main aim of this dissertation is make at the high-resolution stratigraphic subdivision of the basal section from the São Mateus Formation, Albian the Espírito Santo Basin. The interval studied is consists predominantly of alluvial deposits. Against the difficulties presented for the stratigraphic correlation of these deposits, as discussed by Wright &M
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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12. Mercury speciation in urban landfill leachate by cold vapor generation atomic absorption spectrometry using ion exchange and amalgamation
Foi desenvolvido um sistema em linha para a especiação de Hg orgânico (Hg org) e Hg inorgânico (Hg inorg) em chorume. Clorocomplexos produzidos a partir do Hg inorg são separados em uma coluna trocadora de ânions. O Hg retido na coluna é eluído com NaBH4 na presença de HCl. O Hg0 produzido é medido por espectrometria de absorção atômica com gera
Journal of the Brazilian Chemical Society. Publicado em: 2009