Article Environmental Sciences
Dust pollution hazard and harmful airborne dust exposure assessment for remote LHD operator in underground lead-zinc ore mine open stope
B. Paluchamy, Devi Prasad Mishra
Summary: This study assessed the exposure of airborne dust during remote LHD mucking and found that downcast airflow poses the greatest risk to remote LHD operators. It also emphasized the importance of adopting tele-remote-operated LHD and automated mucking operation in open stopes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2022)
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Article Chemistry, Analytical
Haulage Cycles Identification for Wheeled Transport in Underground Mine Using Neural Networks
Artur Skoczylas, Artur Rot, Pawel Stefaniak, Pawel Sliwinski
Summary: The task of ore transportation is crucial in all types of mines, regardless of their mining process. Many enterprises use wheeled machines such as haul trucks and loaders for ore haulage. However, the monitoring process of this task is often based on operators' oral testimony, which can lead to abuse and is repetitive for foremen. In this article, two neural network models are presented to automate the information gathering process for detecting work cycles in the ore haulage process.
SENSORS (2023)
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Article Green & Sustainable Science & Technology
Dust transport behaviour in the Nanwenhe extra-large stepped underground metal mine stope
Binglei Li, Hongyuan Hu, Yi Long, Shulin Zhan, Ziqing Zhang, Wenxin Li, Jianing Li, Jinrui Gong
Summary: This paper investigates the dust behavior in a super-large stepped stope through numerical simulation. The simulation results show that the airflow is affected by the roof fault, causing some of the dust to flow back to the upper stope. The reliability of the simulation method is verified through field measurements. A new intelligent dust removal system is designed based on the dust concentration distribution, achieving a high dust removal efficiency.
JOURNAL OF CLEANER PRODUCTION (2022)
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Article Chemistry, Multidisciplinary
Development of Monitoring Technology for Mine Haulage Road through Sensor-Connected Digital Device and Smartphone Application
Hojin Kim, Woo-Hyuk Lee, Chung-Hyun Lee, Sung-Min Kim
Summary: A system was developed to acquire and share environmental information from vehicles using sensors and smartphones, aimed at preventing accidents on mine haulage roads. The system utilizes GPS and smartphone applications for real-time data collection and sharing, with the ability to identify areas with poor road conditions and atmospheric environment through data analysis.
APPLIED SCIENCES-BASEL (2022)
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Article Metallurgy & Metallurgical Engineering
Process Mineralogy Assisted Iso-Floatability of Copper-Zinc-Lead Minerals from Iron Tailings at Marcona Iron Ore Mine
Wanqing Li, Yubiao Li, Xu Yang, Zhonghong Wang, Wen Chen
Summary: Process mineralogy was used to design the process circuit for magnetite tailings containing copper, lead, and zinc from Marcona Iron Ore Mine. Detailed investigations were carried out on mineralogical parameters such as mineral composition, occurrence, and grain size distribution of the main minerals. The results revealed that the valuable elements were primarily found in magnetite, chalcopyrite, galena, and sphalerite, with significant interlocking relationships observed among the copper-zinc-lead minerals. Consequently, a fine grinding process followed by magnetic separation was necessary for mineral liberation. The application of iso-floatability flotation process to the magnetic tailings resulted in the recovery of copper, zinc, and lead with high grades and recoveries.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW (2023)
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Article Construction & Building Technology
The spread of microbiota in the air of an underground hard coal mine-A case study
Piotr Cheluszka, Iwona Beata Pasmionka, Janina Gospodarek, Frederico Marcio Correa Vieira
Summary: The environment of underground hard coal mines provides optimal conditions for the growth of microorganisms, including pathogens, due to high humidity, temperature, organic substances, and high dust content. This research aimed to determine the quantity and diversity of air microorganisms in underground mining excavations. Microbiological tests were conducted to identify potential pathogens and analyze their spread. The findings highlight the presence of numerous microorganisms, including pathogenic ones, which can pose risks to human health. The results are valuable for improving ventilation systems in mining excavations.
BUILDING AND ENVIRONMENT (2023)
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Article Public, Environmental & Occupational Health
Underground emissions and miners' personal exposure to diesel and renewable diesel exhaust in a Swedish iron ore mine
Louise Gren, Annette M. Krais, Eva Assarsson, Karin Broberg, Malin Engfeldt, Christian Lindh, Bo Strandberg, Joakim Pagels, Maria Hedmer
Summary: This study investigated the effects of diesel exhaust and the use of renewable fuels on underground iron ore miners' personal exposure. The findings showed that the miners' exposures to carbon elemental and nitrogen dioxide were lower, possibly due to intensified emission legislation and new technologies. However, the exposure to semi-volatile polycyclic aromatic hydrocarbons was not affected, and ambient air sampling was not a reliable predictor of personal airborne exposure to these compounds.
INTERNATIONAL ARCHIVES OF OCCUPATIONAL AND ENVIRONMENTAL HEALTH (2022)
Article Social Sciences, Interdisciplinary
An Exploration of Motivations for Women Mine Workers to Work Underground
Sally Ledwaba, Thobeka S. Nkomo
Summary: Despite efforts to attract women to the mining industry through new legislative frameworks, many women entered the industry due to their economic and social circ*mstances. This highlights the barriers that continue to deter women from pursuing careers in mining.
SAGE OPEN (2021)
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Article Engineering, Chemical
Effect mechanism of carbonaceous materials on the flotation separation of lead-zinc ore
Zuchao Pan, Jingjing Xiong, Yanfang Cui, Qian Wei, Wenhao Jia, Zhengquan Zhang, Fen Jiao, Wenqing Qin
Summary: This study investigates the carbonaceous material in lead-zinc ore flotation and finds that carbon pre-flotation can enhance the grade and recovery of lead. The properties of the enriched carbonaceous material are analyzed, and it is found that amorphous carbon is the major component with abundant pore structures and a large specific surface area. The adsorption capacity of amorphous carbon for diethyl dithiocarbamate is superior to that of galena.
SEPARATION AND PURIFICATION TECHNOLOGY (2022)
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Article Green & Sustainable Science & Technology
Bluetooth Beacon-Based Mine Production Management Application to Support Ore Haulage Operations in Underground Mines
Sebeom Park, Yosoon Choi
Summary: An underground mine production management application using Bluetooth beacon and tablet PC was developed to support efficient loading-transport system operation. The app records signals from beacons attached to loading points and crushing sites, allowing truck drivers to input data on the tablet PC. Data recorded during haulage operations are transmitted to a cloud server upon arrival in a communication area, improving production information collection and management efficiency.
SUSTAINABILITY (2021)
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Article Geochemistry & Geophysics
Process Mineralogy Characteristics and Flotation Optimization of a Low-Grade Oxidized Lead and Zinc Ore from Lanping Mine
Anmei Yu, Zhan Ding, Jiaqiao Yuan, Qicheng Feng, Shuming Wen, Shaojun Bai
Summary: This study analyzes the process mineralogy characteristics and optimizes the flotation process of low-grade oxidized lead and zinc ore from the Lanping mine. The results show that the low lead and zinc content and complex co-occurrence relationships between minerals pose a challenge to efficient separation. A flow sheet consisting of lead preferred flotation-zinc flotation is used, along with mixed depressants and cationic-anionic collectors, to achieve effective recovery of lead and zinc. These findings provide important technical support for the processing of similar ores.
MINERALS (2023)
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Article Engineering, Chemical
Efficient recovery of valuable metals from lead-zinc smelting by-products by ultrasonic strengthening
Yingjie Xu, Hongying Xia, Qi Zhang, Wuchen Cai, Guiyu Jiang, Libo Zhang
Summary: This study analyzed the correlation between germanium and other elements in zinc oxide dust, the phase composition of the main elements, and the Eh-pH dominant area of germanium to improve the leaching of zinc and germanium in sulfuric acid. Ultrasonic waves and potassium dichromate were added to enhance the leaching process. The results showed that under the optimum conditions, the recoveries of zinc and germanium were 99.25% and 90.44% respectively. Compared to the existing process, the leaching rate increased by 8-10% and the leaching time was reduced by more than 50%. The oxidation leaching of zinc and germanium from zinc oxide dust with potassium dichromate under ultrasound proved to be efficient, economical, and practical.
MINERALS ENGINEERING (2022)
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Article Medicine, General & Internal
Mortality in Underground Miners in a Former Uranium Ore Mine Results of a Cohort Study Among Former Employees of Wismut AG in Saxony and Thuringia
Michaela Kreuzer, Veronika Deffner, Maria Schnelzer, Nora Fenske
Summary: Underground miners employed by Wismut AG exhibited significantly higher mortality rates due to silicosis/other pneumoconiosis and lung cancer. Different levels of exposure to radon and respirable crystalline silica led to increased mortality rates for different diseases, with this impact still evident more than 20 years after Wismut AG ceased its activities.
DEUTSCHES ARZTEBLATT INTERNATIONAL (2021)
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Article Engineering, Geological
Long-term zinc contamination and transport at the abandoned Ore Chimney mine
C. Harper, C. Walsh, C. Fong, P. R. Gammon, R. T. Amos
Summary: Analysis of the Ore Chimney property in Canada reveals that natural attenuation mechanisms may effectively immobilize metal contaminants over long periods of time.
CANADIAN GEOTECHNICAL JOURNAL (2021)
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Article Environmental Sciences
Pilot Study of Thoron Concentration in an Underground Thorium Mine
R. Lindsay, S. Mngonyama, P. Molahlehi, X. E. Ngwadla, G. J. Ramonnye
Summary: The Steenkampskraal mine in South Africa presents challenges for radiation protection practitioners due to high thoron concentrations. Ventilation and source term investigation can help reduce thoron concentrations, while the thoron progeny may be significantly reduced. Despite high thoron concentrations, it may not be a radiation protection issue.
HEALTH PHYSICS (2022)
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Article Computer Science, Artificial Intelligence
Assessment of relative impacts of various geo-mining factors on methane dispersion for safety in gassy underground coal mines: an artificial neural networks approach
Devi Prasad Mishra, Durga Charan Panigrahi, Pradeep Kumar, Abhijeet Kumar, Pritam Kumar Sinha
Summary: This study developed a model for predicting methane concentration in underground coal mines based on seven different geo-mining factors using multi-layered artificial neural networks. The research revealed that air velocity is the most significant factor influencing methane dispersion, while the surface roughness of mine galley has the least impact. The outcome will be valuable for designing effective mine ventilation systems and improving mines safety.
NEURAL COMPUTING & APPLICATIONS (2021)
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Article Thermodynamics
Study of Pyrolyzates from a Variety of Indian Coals and Their Dependency on Coal Type and Intrinsic Properties - An Analytical Fast Pyrolysis Study
Devi Prasad Mishra, Kanak Kumar, Jaya Narayan Sahu
Summary: This study investigated the pyrolytic products and char yields of nine different Indian coals through analytical fast pyrolysis. The main pyrolyzates in coals were identified, and the char yields were determined. Results showed variations in carbon content and heating value between original coals and chars produced from pyrolysis.
COMBUSTION SCIENCE AND TECHNOLOGY (2022)
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Review Green & Sustainable Science & Technology
Airborne respirable dust in fully mechanised underground metalliferous mines e Generation, health impacts and control measures for cleaner production
B. Paluchamy, Devi Prasad Mishra, Durga Charan Panigrahi, Jiri Jaromir Klemes
Summary: This study focused on dust generation in fully mechanised underground metalliferous mines and its impacts on the environment and health. It discussed the classification, characteristics, monitoring and control measures of dust, as well as the results of related research and future research directions.
JOURNAL OF CLEANER PRODUCTION (2021)
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Article Environmental Sciences
Physico-chemical characteristics of pulverized coals and their interrelations-a spontaneous combustion and explosion perspective
Devi Prasad Mishra
Summary: The study focuses on the physico-chemical characteristics of coal and their interrelations, specifically analyzing the effects of particle size on bulk density, specific surface area, and N-2 adsorption capacity of pulverized coals. As particle size decreases, bulk density decreases while specific surface area increases. Furthermore, correlations between bulk density, specific surface area, and particle size are established.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2022)
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Review Metallurgy & Metallurgical Engineering
Heat Stress in Underground Mines and its Control Measures: A Systematic Literature Review and Retrospective Analysis
Siddhartha Roy, Devi Prasad Mishra, Ram Madhab Bhattacharjee, Hemant Agrawal
Summary: Heat stress is a major concern for miners working underground in hot and humid environments, impacting their health, safety and productivity. The development of a better heat stress index, incorporating personal, environmental factors and pre-developed fatigue, is essential to address the health hazards and safety issues faced by miners in high-temperature underground zones.
MINING METALLURGY & EXPLORATION (2022)
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Article Environmental Sciences
Dust pollution hazard and harmful airborne dust exposure assessment for remote LHD operator in underground lead-zinc ore mine open stope
B. Paluchamy, Devi Prasad Mishra
Summary: This study assessed the exposure of airborne dust during remote LHD mucking and found that downcast airflow poses the greatest risk to remote LHD operators. It also emphasized the importance of adopting tele-remote-operated LHD and automated mucking operation in open stopes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2022)
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Article Geosciences, Multidisciplinary
Genetic programming for prediction of heat stress hazard in underground coal mine environment
Siddhartha Roy, Devi Prasad Mishra, Ram Madhab Bhattacharjee, Hemant Agrawal
Summary: Underground mining is a hazardous profession, with miners facing various risks and dangers. The increasing demand for coal leads to the extraction of coal at a higher rate and the depletion of easily minable shallow coal deposits. This necessitates the mining of deep-seated deposits using underground methods. However, this poses a threat to miners' health, productivity, and safety due to the increasing heat stress associated with rising depth and the use of high-capacity machines. This study focuses on predicting heat stress in underground coal mines using a detailed field survey and genetic programming (GP) to establish a correlation between environmental parameters and heat stress. The results show that GP can effectively predict heat stress in underground mines, with a good correlation coefficient. Sensitivity analysis reveals that all input parameters have a considerable effect on heat stress, with dry-bulb temperature having the highest effect.
NATURAL HAZARDS (2022)
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Article Green & Sustainable Science & Technology
Developing an Alternate Mineral Transportation System by Evaluating Risk of Truck Accidents in the Mining Industry-A Critical Fuzzy DEMATEL Approach
Binay Prakash Pandey, Devi Prasad Mishra
Summary: The mining industry requires an innovative transportation system to replace the resource-intensive and accident-prone truck haulage. This paper utilizes the Fuzzy DEMATEL approach to assess the critical factors behind truck accidents and suggests the use of a pipe conveyor system as a safer alternative for mineral transportation.
SUSTAINABILITY (2023)
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Article Metallurgy & Metallurgical Engineering
WBGT Prediction and Improvement in Hot Underground Coal Mines Using Field Investigations and VentSim Models
Siddhartha Roy, Devi Prasad Mishra, Hemant Agrawal, Ram Madhab Bhattacharjee
Summary: Heat stress in underground coal mines is a major threat to the health and safety of the miners. This study utilized 3D simulation models to predict heat stress conditions and explored the use of auxiliary ventilation and spot coolers to reduce the wet-bulb globe temperature (WBGT) and improve the underground workplace environment. The results demonstrated the effectiveness of spot coolers in reducing heat stress conditions in comparison to auxiliary ventilation.
MINING METALLURGY & EXPLORATION (2023)
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Article Environmental Studies
Coal mine explosions in India: Management failure, safety lapses and mitigative measures
Aashish Sahu, Devi Prasad Mishra
Summary: This paper critically analyzes data on major explosions that have occurred at Indian coal mines over the past 120 years (1900-2020). It shows that a large percentage of mine explosions and associated casualties in India have occurred in Jharkhand and West Bengal states. However, the number of mine-related accidents and casualties attributable to explosions have significantly reduced overall in the last few decades, most noticeably since nationalization of the coal industry. The use of defective safety lamps and naked lights are identified as the main sources of ignition for explosions.
EXTRACTIVE INDUSTRIES AND SOCIETY (2023)
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Article Environmental Sciences
Methane migration and explosive fringe localisation in retreating longwall panel under varied ventilation scenarios: a numerical simulation approach
Sunny Rao, Devi Prasad Mishra, Aishwarya Mishra
Summary: Computational fluid dynamics (CFD) simulations were conducted on a longwall panel in a methane-rich inclined coal seam of the Moonidih mine in India. The study found that ventilation parameters significantly influence methane flow in the longwall tailgate and goaf. Methane accumulation on the rise side wall of the tailgate was attributed to geo-mining parameters, and the turbulent energy cascade impacted methane dispersion along the tailgate. Increasing the inlet air velocity decreased methane concentration in the tailgate outlet but increased oxygen ingress into the goaf, expanding the explosive zone. This study highlights the importance of novel strategies to mitigate methane hazard in U-type longwall mine ventilation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2023)
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Article Environmental Sciences
Prediction of spontaneous combustion susceptibility of coal seams based on coal intrinsic properties using various machine learning tools
Uma Shankar Shukla, Devi Prasad Mishra, Aishwarya Mishra
Summary: Spontaneous combustion of coal is a major problem worldwide, causing significant economic loss to India. Predicting the susceptibility to spontaneous combustion is crucial for preventing fire risks in coal mines and utility sectors. This study utilized multiple linear regression and five different machine learning techniques to predict the spontaneous combustion susceptibility of coal based on its intrinsic properties.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2023)
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Article Environmental Sciences
Effects of intrinsic properties, particle size, bulk density, and specific gravity on thermal properties of coal dusts
Aashish Sahu, Devi Prasad Mishra
Summary: This study measured the thermal properties of five coal samples at six different particle sizes using an advanced thermal property analyzer. The thermo-physical properties of coal dust were found to be positively correlated with the particle size and the ash percentage, bulk density, and specific gravity of coal dust. However, they were negatively correlated with the fixed carbon and volatile content of coal. Empirical relations between the thermo-physical properties were established. The thermal conductivity, diffusivity, and specific heat capacity of coal dusts varied within certain ranges, depending on the particle size and coal sample.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2023)
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