Mine Planning
Mostrando 25-36 de 36 artigos, teses e dissertações.
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25. Duality results for stationary problems of open pit mine planning in a continuous function framework
Open Pit Mine Planning problems are usually considered in a Mixed Integer Programming context. Characterizing each attainable profile by a continuous function yields a continuous framework. It allows for a more detailed modeling of slope constraints and other material properties of slanted layers. Although the resulting nonlinear programming problems are in
Computational & Applied Mathematics. Publicado em: 2011
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26. Benefício do adensamento amostral com perfilagem geofísica no planejamento de lavra a curto prazo = Benefit of additional samples derived from geophysical logging to short term mine planning / Benefit of additional samples derived from geophysical logging to short term mine planning
Sondagens com amostragem são comumente utilizadas e de extrema importância para o desenvolvimento da pesquisa e do planejamento da lavra. No entanto, esse tipo de informação é cara de ser obtida e, freqüentemente, sondagem exploratória é usada em planejamento de curto prazo. Sondagens exploratórias, invariavelmente, são coletadas em uma malha amost
Publicado em: 2010
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27. Análise estrutural no planejamento de lavra de rocha ornamental
A análise estrutural de um maciço rochoso é uma importante ferramenta a ser aplicada ao planejamento de lavra de rocha ornamental. Além do mapeamento das descontinuidades, é importante definir-se como estão distribuídas as tensões no maciço rochoso. Nesse trabalho, apresenta-se uma análise estrutural do Sienito Piquiri, RS, com aplicação no plane
Publicado em: 2010
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28. Estratégia de controle de qualidade de minérios na lavra utilizando simulação geoestatística
Novas centrais térmicas utilizam carvão ROM (run of mine) na geração de energia termoelétrica. Assim, flutuações de qualidade do carvão serão transferidas da mina para o consumidor final. Contratos entre produtor-consumidor estabelecem limites para parâmetros geológicos e tecnológicos do produto final (minério ROM). O descumprimento dos limites
Publicado em: 2010
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29. Caracterização de minério de ferro por espectroscopia de reflectância difusa
The identification and quantification of the mineralogical phases present in iron ore is of crucial importance, both for quality control and well as for mine planning, processing, etc.. The element iron is usually found in the form of oxides or hydroxides, such as hematite (α- Fe2O3), goethite (α-FeOOH) and magnetite (Fe3O4), and their colors are a
Publicado em: 2010
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30. Alocação econômica de recursos naturais no contexto de bacia hidrográfica : aplicação na bacia do rio Sangão em Santa Catarina
The environmental impacts caused by natural resources exploration may cause damages to third parties, since these agents¿ actions harm the environment and, in some cases, make the existence of other activities unfeasible. This context includes coal mining and irrigated rice cropping. Coal mining and beneficiation make possible the contact between water and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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31. Aprimoramento do controle de qualidade do minério no planejamento de lavra de curto prazo: estudo de caso. / Improvement of the quality control of mining en the planning of short term - cause study.
Improve knowledge of the ore mined is a challenge faced daily by mining companies. This paper is a study in apatite mine, located in the city of Cajati, within São Paulo,propriety of Bunge Fertilizantes S/A, where are treated issues related to short term planning of the mine to improve procedures for collecting dust samples drilling, which are systematicall
Publicado em: 2009
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32. Analysis of the impact of the operational variability onto execution of a mine plan. / Impacto da variabilidade operacional na execução do plano de lavra.
One of the main challenges for mine planning engineers is to produce operationally feasible mine plans which take into account the practical variability of the mining operation. It is quite common for the mining industry to work with plans that have been based on estimated means or historical values for most of the key operational variables, which although a
Publicado em: 2009
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33. Metodologia de planejamento estratégico de lavra incorporando riscos e incertezas para a obtenção de resultados operacionais. / Strategical minnig planning methodology incorporating risks and uncertanties to obtain operational results.
Strategic mine planning corresponds to the process to determine the best mine design and scheduling according to a previously stablished strategy. It is considered as a key element for the success of a mining venture, once supports the decision process related to it conduct and development. Conventional strategic mine planning methods are based on determinis
Publicado em: 2008
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34. Efeito de alterações do habitat na composição e estrutura da comunidade de aves de sub-bosque no Planalto Paulista, Sudeste do Brasil / Effects of habitat modification in the composition and structure of the understory bird community of Planalto Paulista, Southern Brazil
Birds are one of the traditionally studied groups on environmental impact assessments, which seek to understand the effects of human activities on communities and/or populations. This understanding is essential to create guidelines for future enterprises or for planning the use of land, with the objective of mitigating the negative effects of human activitie
Publicado em: 2008
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35. Modelo de gerenciamento de informações na cadeia de valor de mineração e de petróleo. / Information management model in the mining and oil value chain.
This thesis starts by identifying the key issues of the research: visualization and management of information. It is widely known that one of the most common difficulties in information management is to obtain a complete and integrated view of all the company processes and activities. Another common difficulty is to maintain the necessary data always precise
Publicado em: 2007
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36. INTELLIGENT ASSISTANCE FOR KDD-PROCESS ORIENTATION / ASSISTÊNCIA INTELIGENTE À ORIENTAÇÃO DO PROCESSO DE DESCOBERTA DE CONHECIMENTO EM BASES DE DADOS
Generally speaking, such aspects involve difficulties in perceiving innumerable facts whose origin and levels of detail are highly diverse and diffused, in adequately interpreting these facts, in dynamically conjugating such interpretations, and in deciding which actions must be performed in order to obtain good results. How are the objectives of the process
Publicado em: 2003