Underground Mining
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. Unplanned dilution back analysis in an underground mine using numerical models
Abstract In underground mines, stability problems can cause unplanned dilution, increasing the costs of mining operations, such as loading, transport, crushing and grinding. This is usually dealt with by simply increasing investments with support. However, the design geometry of stopes and drifts also has a great effect on a stope’s stability. The use of e
REM - International Engineering Journal. Publicado em: 2022
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2. Geostatistical simulations with heterotopic hard and soft data without modeling the linear model of coregionalization
Abstract Most mining decisions are based on models estimated/simulated given the information obtained from samples. During the exploration stage, samples are commonly taken using diamond drill holes which are accurate and precise. These samples are considered hard data. In the production stage, new samples are added. These last are cheaper and more abundant
REM, Int. Eng. J.. Publicado em: 2021-06
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3. Peculiarities of drilling and blasting in underground small-scale mines
Abstract Artisanal and Small-scale Mining (ASM) is a prominent activity in the extractive industry: considering only gold, it produces about 20% of the world market supply. Despite this fact, ASM is generally associated with the negative aspects of its environ mental impact, and operational research is generally neglected. This article empha sizes the peculi
REM, Int. Eng. J.. Publicado em: 2020-09
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4. Open stope stability assessment through artificial intelligence
Abstract Underground mining is a set of methods that allows the extraction of ore in depth, ensuring sustainability and economic viability. One of the problems that arise in underground mine operations is open stope stability. The method for assessing stabil ity of open stopes is the stability graph proposed by Mathews et al. (1981). It is possible to estima
REM, Int. Eng. J.. Publicado em: 2020-09
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5. Chilean artisanal mining: a gambling scenario
Abstract One of the most characteristic aspects of artisanal mining is the lack of geological exploration. Going into production without previous exploration is here defined as a gambling scenario. The present study intended to quantify the risk associated to such gambling by analyzing the operations of an area of artisanal underground gold mining in central
REM, Int. Eng. J.. Publicado em: 2020-06
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6. Physical stability of iron ore caves: geomechanical studies of a shallow underground cave in SE Brazil
Abstract Caves hosted in iron formations are attracting considerable interest due to their scientific and environmental value. Some of these caves are located in or near iron ore mine sites, which represent an important source of income to Brazil. However, the Brazilian legislation requires speleological studies that currently have an impact upon ore reserve
REM, Int. Eng. J.. Publicado em: 2019-06
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7. Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways
Abstract Roadway deformation and coal bumps are major challenges for underground engineering. Taking the Lu'an mining district in Shanxi Province as an example, the failure mechanism of deep high-stress roadway was studied. Numerical simulations and the similar material test were performed to investigate the effect of the roof presplitting and rock mass fill
Lat. Am. j. solids struct.. Publicado em: 27/05/2019
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8. Mine closure in Ouro Preto: the remnants of the 18th century gold rush and the tourism as an economic opportunity
Abstract Mine closure is the set of all activities that follow the end of the productive phase of a mine, characterizing itself as the process of returning an area transformed by mining into a new condition of sustainability, considering the potential future and the best possible reclamation of the area impacted. However, such an understanding was not concei
REM, Int. Eng. J.. Publicado em: 2019-03
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9. Analysis of options of production and access ways in underground mines
Abstract This article aims to review the issues to be considered in choosing primary access and transportation options for underground mines. The main accesses to underground orebodies are declines or vertical shafts. They serve both as a way to transport ore or waste, and move people, equipment or supplies. In underground mines, the ore transport option sig
REM, Int. Eng. J.. Publicado em: 2017-06
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10. Analysis of the economic feasibility of a mining project due to the presence of natural underground cavities
The legislation for the protection and conservation of caves is recent in Brazil. In 2008, the Decree 6.640 was enacted and in 2009, the Normative Instruction Nº 2 by the Brazilian Environment Ministry (MMA, Portuguese acronyms) was published. Mining operations cause a significant impact on the caves when they are present in or next to the mineral body. The
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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11. Mine surveying works for the purpose of excavating the remaining reserves of bauxite in the deposit of "Podbracan"
Mining projects for mineral resource mining contain in certain cases specific technical and technological solutions, these being the result of the mine’s characteristic spatial position and the geometry of the ore deposit, existing mining works, structures, and terrain relief etc. For the purpose of completion of the mining project, it is necessary to carr
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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12. Aspectos sócio-econômico-ambiental do processo de extração do caulim no município de Junco do Seridó-PB
The paper entitled "Socio-Economic and Environmental Process Extraction of Kaolin in the Municipality of Junco do Seridó/PB" is a guided study on the extraction of kaolin in the municipality of Junco do Seridó/PB, which is the largest production center of this mineral in the state Paraíba. This activity is the basis of an extensive and complex supply chai
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011