Grade Estimation
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Ore resource estimation based on radial based functions - Case study on União Luiz and Morro do Carrapato Gold Deposits (Alta Floresta Gold Province)
Abstract Radial basis functions can be used as an alternative method for mineral resource estimation when ordinary kriging cannot be done because it is impossible to calculate an experimental variogram. Interpolation based on radial based functions is a method that is similar to ordinary kriging. In this context, this article presents the results of gold res
REM, Int. Eng. J.. Publicado em: 19/06/2019
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2. NPV analysis of multiple surface constraints for pit expansion scenarios under geological uncertainty
Abstract To optimize a mining project, it is necessary to deal with several technical aspects and constraints, such as orebody modelling, reserve estimation, blending strategy, optimal and operational pit designs, cost control, environmental issues, among others. In this sense, locating surface infrastructures is one of the most critical mine planning concer
REM, Int. Eng. J.. Publicado em: 2019-06
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3. Field parametric geostatistics - An alternative to tackle gold grade estimations
Abstract High anomalous grades are very common in gold deposits, whose presence requires careful treatment to prevent overestimation of metal content. Mineral resource analysts have worked on the estimation of several gold deposits, and none of the classical methods were able to avoid manual interventions, such as cutting high grades for local estimation or
REM, Int. Eng. J.. Publicado em: 2019-03
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4. Improving short-term grade block models: alternative for correcting soft data
Abstract Short-term mining planning typically relies on samples obtained from channels or less-accurate sampling methods. The results may include larger sampling errors than those derived from diamond drill hole core samples. The aim of this paper is to evaluate the impact of the sampling error on grade estimation and propose a method of correcting the impre
REM, Int. Eng. J.. Publicado em: 2018-03
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5. Estimation of the Fracture Toughness Threshold of a Ferritic Steel at the Lower Ductile to Brittle Transition Region
The ADN420 ferritic steel (A615 steel Grade 60 [420]), used as reinforcing bars (rebar) in concrete, shows the so called ductile to brittle transition. Room temperature is located on the lower third region of the transition zone. In this work, the fracture toughness of this steel working at room temperature was studied statistically. For such a purpose, 125
Mat. Res.. Publicado em: 18/08/2016
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6. How the use of stratigraphic coordinates improves grade estimation
Abstract Some mineral deposits show mineralization along layers. These layers may pass through several subsequent geological events such as folding and/or severe erosional processes. Grades within these deposits tend to be correlated along orientations where the mineralization was originally deposited or along the same geological period (stratigraphic level)
Rem: Rev. Esc. Minas. Publicado em: 2015-12
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7. Navegação terrestre usando unidade de medição inercial de baixo desempenho e fusão sensorial com filtro de Kalman adaptativo suavizado. / Terrestrial navigation using low-grade inertial measurement unit and sensor fusion with smoothed adaptive Kalman filter.
This work presents the development of the mathematical models and the algorithms of a sensor fusion system for terrestrial navigation using a low-grade inertial measurement unit (IMU) and the Extended Kalman Filter. The models were developed on the basis of the strapdown inertial navigation systems (SINS). Low-grade designates an IMU that is not able to perf
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
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8. O impacto do tipo de amostragem no controle de qualidade na lavra = Influence of the sampling method on grade control
Um dos grandes desafi os enfrentados pela indústria mineral é a difi culdade em prover à usina de benefi ciamento minérios que possuam as especifi cações de teores adequadas para seu bom desempenho. O conhecimento geológico das diferentes litologias que formam uma jazida é etapa fundamental para a garantia da qualidade esperada do minério, mas não
Publicado em: 2011
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9. Probabilidade de progressão por série no Brasil: evolução, seletividade e aplicação de modelos de idade-período-coorte
The provision of the universal access to schooling and the assurance of students permanence in school has been the object of public policies in almost all nations. Education is conceived not only as a form of individuals emancipation, but also as an important factor to promote the economic and social development. Since the 90s, Brazil has seen the implementa
Publicado em: 2010
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10. STUDY ABOUT THE BEHAVIOR OF SLAB-ON-GRADE CONCRETE FOUNDATION SETTLE ON SEDIMENTARY SOIL IN THE SANTA MARIA REGION / ESTUDO DO COMPORTAMENTO DE SAPATAS DE CONCRETO ARMADO ASSENTES SOBRE SOLO SEDIMENTAR DA REGIÃO DE SANTA MARIA
Superficial foundations transfer the load to soil by the distributed tensions on the base of the foundation element and, projects are normally conditioned to crack and displacement criteria. In the ordinary engineering practice, especially in the Santa Maria region, due to the absence of constitutive models and experimental data, empirical and semi-empirical
Publicado em: 2007
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11. Evaluation the use of measure of impedance in the passenger-car equivalents for tucks / Avaliação do impacto da medida de desempenho no equivalente veicular de caminhões
The objective of this research was to evaluate the use of a measure of impedance alternative to density to obtain passenger-car equivalence factors for typical trucks on multilane highways in the state of São Paulo. The impedance investigated was the passenger-car speed, and the equivalence factors were obtained through the average equivalent method since i
Publicado em: 2007
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12. Avaliação da evolução da atividade eletrica cerebral em recem-nascidos atraves da polissonografia
The maturational changes in EEG patterns during sleep in premature and full-term infants has been described by many authors (DREYFUSBRISAC, 1962; PARMELEE et aI., 1968; LOMBROSO, 1979; SCHER &BARMADA, 1987; FERRARI et aI., 1992). The purpose of this study is to contribute to the process of normatization of neonatal EEG. We have observed the relation between
Publicado em: 1994