There are a large number of thick alluvium and thin bedrock deposits at depth in the Henan coal base. The degree of surface mining is high, and the surface environment is seriously damaged. Using indoor experiments, numerical simulation, and field measurement, it is studied the influence of the mechanical properties of thick …
Metallurgical coal miners are chasing favorable prices in a tight market and forging ahead with development and ramp-up plans for relatively new mining projects in the US. Several US companies have …
The excavation-induced stresses transferred from the panels or pillars in upper coal seams play a key role in the occurrence of rockbursts in driving roadways during close-distance coal seam mining, which has become a common problem and threat to many underground mines. The authors established a 3D finite-difference numerical …
Coal, a significant component of global energy production, continues to play a crucial role in the world economy [1,2,3,4].In 2022, global coal demand reached its highest level to date [].While this trend persists, there is a need to enhance efficiency and undertake improvement efforts in coal mining to contribute to the overarching goal of energy …
This paper proposes a new method to estimate the percentage of load carried by the gob in underground coal mines using a new parameter that introduces the site-specific overburden geology. The new parameter was defined as the total strong layer thickness (tstr) that represents the strength and stiffness of the overburden with a single …
The heavy metal pollution of soils has become serious environmental problem, mainly in localities with high industrialization and rapid growth. The purpose of this detailed research was to determine the actual status of heavy metal pollution of soils and an assessment of heavy metal pollution in a highly industrialized city, Ostrava, with a …
Methane gas explosions are a major risk in underground coal mining operations. The severity of such explosions can range from local area damage to massive loss of miners' lives along with significant damage to mine infrastructure and ventilation controls that may lead to mine closure and loss of the entire operation. Computational …
The technology of automatically formed roadway without pillars (AFRP) via roof cutting and pressure releasing (RCPR) is a reformatory method for gob-side entry retaining, which automatically creates a roadway by utilizing the fragmenting and expanding properties of rock strata and the mining pressure, to realize a novel technique for coal …
2.1 Building the Dataset. Based on the literature, researchers have employed various mine's fire influencing parameters including O 2, N 2, and CO 2 in percent, CO in parts per million, and temperature in degree Celsius as input parameters to predict the early detection of mine fire in underground coal mines [4, 12].In order to …
The MINER Act of 2006 mandates wireless two-way communication systems in underground coal mines in the USA. In addition, in 2015, the Mine Safety and Health Administration (MSHA) issued a final rule that requires operators of underground coal mines to equip place-changing continuous mining machines (CMMs) with proximity …
Allegheny Metallurgical is a metallurgical coal operation nestled in the Allegheny Mountains of West ia in the small community of Volga. More than a half billion …
Coal, as one of the vital sources of energy in China, has raised widespread concerns regarding its safety issues amidst the country's economic growth driven by coal. To address this concern, this study employed the Kuznets curve, multiple linear regression, and data envelopment analysis models to investigate the impact of Chinese coal …
American met coal is a key component of our industrial supply chain and our global economic reach. Not only is met coal helping supply the steel for domestic infrastructure, but U.S. coal was exported to 71 …
He is a Professional Engineer, a Fellow of the Southern African Institute of Mining and Metallurgy (SAIMM) and is a Past Fellow (2017-2018) of the African Science Leadership Program. Read More. Bernard Swanepoel Honoured with the Prestigious Brigadier Stokes Award by the South African Institute of Mining and Metallurgy
Mining, Metallurgy & Exploration - During the past 15 years, roof fall rates have fallen dramatically in US coal mines, particularly in regions where the roof is weakest. ... Coal mine roof rocks can vary widely in composition and other properties that determine their ability to form a stable mine roof. The two most important factors included ...
Australia dominates the seaborne market for metallurgical coal, accounting for more than half of global volumes, and about three times the shipments of the next biggest exporter, the United...
Over the past decade, U.S. coal production has fallen by half as utilities switched to cheaper natural gas or renewable energy. But this year, demand is up for a …
Despite being crucial for meeting the world's energy demands, coal mining operations present considerable health risks, especially when it comes to exposure to coal dust. Longwall coal mining, an advanced technique, has considerably enhanced production but made dust control more difficult. Due to its explosive nature, coal dust …
Mining, Metallurgy & Exploration - This article offers an examination of a retreat mining method conducted at the Pinoura Mine in India from 2010 to 2017. ... The same approach and manner of pillar extraction is being practised at Vindhya Mine with high coal recovery and less strata control issues having geomining conditions similar to …
Metallurgical coal, also known as met and coking coal, is a naturally occurring sedimentary rock found within the earth's crust. Met coal encompasses a wide range of quality grades including hard coking coal, semi-hard coking-coal, semi-soft coking coal and pulverised …
Controlling dust generation and keeping it below permissible limits to meet federal dust standards at the working face of a room-and-pillar coal mine is a challenge for a mine operator. With the recent changes in federal dust regulations requiring lower worker exposure, maintaining compliance has become increasingly difficult. The current most …
Exposure to respirable crystalline silica (RCS) can cause serious and irreparable negative health effects, including silicosis and lung cancer. Workers in coal mines have the potential of being exposed to RCS found in dust generated by various mining processes. The silica content of respirable dust in one single mine can vary …
Download Citation | Sustainable Change of Coal-Mining Regions | According to the model of product life cycles, the global coal mining industry is in the stagnation phase. ... Mining Metallurgy ...
The mining-induced failure of the coal seam floor is essential for water inrush. The mining disturbance to the floor, especially in the thick coal seam, is severe, and the water inrush risk is also higher than that in regular thick coal seam excavation. The superposition of many stresses, including in situ stress, mining-induced stress, and …
The characterization of respirable dust on the basis of constituent fractions and particle sizes is increasingly of concern for evaluating exposure hazards. For high-resolution particle analysis, scanning electron microscopy with energy dispersive X-ray (SEM-EDX) can be an effective tool. However, it requires particles to be deposited on a …
Mining geological conditions are complicated and unpredictable, and coal mining is a sophisticated engineering system. Above the coal seam, strata with variable thicknesses and strengths are produced as a result of the different timing and composition of the rock formation [1, 2].As a result, coal seam mining disturbs geological strata in …
Despite the significant role of coal in the economic progress of nations, the occupational and health risks associated with its mining pose a major concern for industry stakeholders. The occurrence of roof collapses in coal mines remains a critical factor leading to substantial loss of life and financial damages for miners. Therefore, accurately …
This paper addresses the surrounding rock control problem of deep roadways in broken soft rock. The 21914 working face haulage roadway in the Zhangshuanglou coal mine was taken as a case study. The deformation characteristics and failure mechanisms of the roadway surrounding rock were analysed via theoretical analysis and numerical …
Coking coal, or metallurgical coal, has been produced in the United States for nearly 200 years. Coking coal is primarily used in the production of coke for use in the steel …
The case study was conducted in an underground coal mine to characterize submicron aerosols at a continuous miner (CM) section, assess the concentrations of diesel aerosols at the longwall (LW) section, and assess the exposures of selected occupations to elemental carbon (EC) and total carbon (TC). The results show that aerosols at the CM …
Metallurgical coal or coking coal is used in the process of creating coke necessary for iron and steel-making. Coke is a porous, hard black rock of concentrated …
One such process is the generation of acid mine drainage (AMD). AMD is very common in many coal mining districts and results from the exposure and oxidation of pyrite during mining. During the generation and migration of AMD, liberated sulfuric acid mobilizes several metal ions including REEs. ... Mining, Metallurgy & Exploration 36, …
Metallurgical coal miners are chasing favorable prices in a tight market and forging ahead with development and ramp-up plans for relatively new mining …
Yin L, Liang JY, Zhu ZC, Dai YL (2010) Simulation analysis of coal floor undulation based on long wall working face. Coal Mine Mach 31(10):75–77. Google Scholar Shi H, Xie J, Wang X, Li J, Ge X(2020) An operation optimization method of a fully mechanized coal mining face based on semi-physical virtual simulation.
The purpose of this detailed research was to determine the actual status of heavy metal pollution of soils and an assessment of heavy metal pollution in a highly industrialized city, Ostrava, with a history of long-term impacts from the metallurgy industry and mining. The ecological risks to the area was subsequently also assessed.
Ronghong et al. examined the feasibility of selected physical separation techniques, including particle size, and magnetic and density separation methods, for the enrichment of REE from several sources including coal, coal ash, coal mining byproduct samples, clay, and shale . REE concentration in the fly ash samples generally increased …
Mine coal flow transportation has some typical features of long-distance and complex environments. The transportation equipment usually adopts the mode of constant speed, which makes a large amount of energy waste. To solve these problems, the characteristics of the coal flow transportation system are analyzed. Based on a principal …
Metallurgical coal, also known as met and coking coal, is a naturally occurring sedimentary rock found within the earth's crust. Met coal encompasses a wide range of quality grades including hard coking coal, …
