Underground coal mining can affect wells and springs used as water supplies. In ia, concerns over such impacts are felt by both surface owners and coal-mining firms. ia's geologic history has caused faults and fractures to be common in its coalfield region, relative to other Appalachian coal-mining areas. The results of 73 investigations …

This paper provides the results of the numerical investigations, conducted to provide insights into where, when, and how, groundwater outbursts may occur in …

Coal geology. About 201,000 acres of residential and other built-up land lie close to Illinois' approximately 5,500 underground coal mines. ISGS offers an online Coal Mines in Illinois Viewer (ILMINES) to help home and business owners determine the proximity of coal mines and underground industrial mines to their properties. Although subsidence is …

Underground coal gasification (UCG) is essentially the same chemical conversion process used in surface coal gasification plant to convert solid coal into a mixture of useful gases known as synthesis gas (or syngas). ... but its application is highly dependent on coal seam geology, that is, coal seam dip angle of greater than 60 degrees.

Underground coal mining leads to land subsidence, which, in turn, results in damage to buildings and infrastructure, disturbs the original ecological environment, and hinders the sustainable ...

This review focuses on water–rock interaction (WRI) in underground coal mining and lists the main issues of WRI. The corresponding analysis methods (laboratory …

Exploration for UCG is different from that for underground coal mining since UCG requires much better understanding of coal geology and hydrogeology. As in exploration for coal …

This study investigates the differences between coal and gas outbursts under various geological structural conditions and the impact of the geological structure on outburst distribution. This reveals the controlling …

Coal Mining Coal can be extracted from the earth either by surface mining or underground mining. Once coal has been extracted, it can be used directly (for heating and industrial processes) or to fuel power plants for electricity. Surface Mining If coal is less than 61 meters (200 feet) underground, it can be extracted through surface mining.

The emission of gas from the coal seams is one of the most important issues during the underground coal mining operation. Each year, coal gas emission from the underground stopes leads to the death of a large number of miners and is one of the biggest threats to workplace safety. In addition, ventilating and releasing coal gas …

Geological structures such as faults and dykes are one of the main contributors of catastrophic rock and/or coal burst events in underground mines. This study focuses on the impacts of faults on burst proneness in development roadways using the Universal Distinct Element Code (UDEC). A sensitivity analysis on the influence of …

The Cherokee coal bed is a locally thick and laterally continuous coal bed in the Overland Member of the Paleocene Fort Union Formation in south-central Wyoming. It represents a significant resource that is easily accessible and may be extractable through both surface and underground mining methods. A database of more than 600 data …

coal utilization related to geology and constituents of coal; emission reduction and carbon capture, storage, and utilization; geological and environmental aspects of coal fires and underground coal gasification. Application of computational methods for …

International Journal of Coal Geology. Supports open access. 11.3 CiteScore. 5.6 Impact Factor. Articles & Issues. About. Publish. Order journal. Menu. Articles & Issues. ... Insights into solid-gas conversion and cavity growth during Underground Coal Gasification (UCG) through Thermo-Hydraulic-Chemical (THC) modelling. Wu Gao, Renato ...

Underground Coal Gasification (UCG) takes advantage of the same chemical reactions of coal to produce product gases, as those occurring in conventional gasifier reactors. The main difference is that in UCG the underground coal seam itself becomes the reactor, so that the gasification of the coal takes place underground instead of in a manufactured …

10 Geology and Coal Mining, 271 10.1 Introduction, 271 10.2 Underground mining, 271 10.3 Surface mining, 287 11 Coal as an Alternative Energy Source, 303 11.1 Introduction, …

Mining-induced stresses in underground coal mines play a significant role in pillar and support design, hence in the safety of mining operations. Adequate design of pillars and roof control plans rely on the accurate assessment of the mining-induced loads, as well as the load-bearing capacities of the supports. In pillar design tools frequently used by the …

Short description: Underground Coal Mines, 20161231 (1:24,000) - Shows the locations and extents of underground coal mines. Includes locations for all documented underground mines that operated in Indiana since the late 1800s, through 2016. Mines can be differentiated based on mine type, mine number, source information, and dates of …

The CO 2 geological storage in Ordos Basin and coal mining activities occurring simultaneously at the same location is a highly challenging coupled thermo-hydro-mechano-chemical (THMC) problem. To address this problem, an in-house program named "AEEA Coupler" was developed by linking two commercial software packages, Simulia …

Underground coal fires are phenomena that coal seams burn due to natural or human factors and gradually develop to cause great harm to coal resources and the surrounding environment (Stracher and Taylor 2004; Pone et al. 2007).Coal fires are major catastrophes that occur in all coal-producing countries worldwide, particularly in China, …

Using the hydraulic fracturing in-situ stress testing rig with small boreholes,stress measurements were carried out at 14 sites near the large syncline structure in the Huating coal mining area,where steep and extremely thick coal seams are typical in China,to analyze the in-situ stress variation in different parts.Measured data point out that the …

The underground coal gasification is a continually evolving technology, which converts coal to calorific gas. There are many important parameters in this technology, which are difficult to measure. These parameters include the underground cavity growth, amount gasified coal, and the leakage of input and output gaseous components into the ...

An independent examination of the issues and evidence surrounding Underground Coal Gasification. 2. Geology. 2.0 This chapter sets the fundamental starting point for consideration of the potential UCG resource. Presentation of the issues was aided by inputs from interviews with Dr Alison Monaghan at BGS and Professors Haszeldene …

Geology and Mineral Resources. Energy Resources. Coal. ia's coal miners reported production of 10.2 million short tons of bituminous coal in 20221, down about 15 percent from the production reported in 2021. Underground mining accounted for about 75 percent of ia's coal output.

Coal Geology covers all aspects of coal geology in one volume, bridging the gap between the academic aspects and the practical role of geology in the coal industry. ... 11.3 Underground coal gasification (UCG) 322. 11.4 Coal as a liquid fuel 330. 11.5 Coal as an oil-prone source rock 332. 12 Coal Use and the Environment 339. 12.1 Introduction ...

The identification and mitigation of adverse geologic conditions are critical to the safety and productivity of underground coal mining operations. To anticipate and …

Cleats & Joints. Fracturing is the basic element of tectonic disturbance. The process of folding gives rise to fracturing in beds. Cleats are natural fractures in coal. Methane and other coal seam gases will flow out of pores of coal if there is a pressure gradient acting as a driving force and the fractures are sufficiently open or permeable.

Coal is typically extracted from underground or surface mines. Underground mining methods include room and pillar, longwall, and retreat mining, while surface mining methods include strip mining, mountaintop removal, and open-pit mining. ... Although coal is known from most geological periods, 90% of all coal deposits were …

@article{osti_160254, title = {Geological features that contribute to ground control problems in underground coal mines}, author = {Shea-Albin, V R}, abstractNote = {Ground control problems are an important factor affecting safety, production, and efficiency in underground coal mines. A major portion of ground control problems encountered in …

Underground Coal Gasification (UCG) is the process of in-situ gasification of coal aiming at recovery. of heat value for power generation and, usable g aseous products as feed stocks for chemicals ...

In Chinese coal mines, the geological environments of coal seams are complex, and influenced by numerous types of geological structure such as faults, folds and collapse features. ... In most of the underground coal mines in China the overcoring method is applied to measure in-situ stresses with hydraulic fracturing being used in very …

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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 …

Coal is mined by both surface or 'opencut' (or opencast) and underground or 'deep' mining methods, depending on the local geology of the deposit. Underground mining currently accounts for about 60 per cent of world coal production but around 80 per cent of Australia's coal is produced from opencut mines.

1. Introduction. Reducing worldwide methane emissions from open pit and underground metallurgical coal (MC) mines is required to reduce the carbon intensity of a very high-value export industry, critical to the production of steel products to meet international urbanisation and energy system transformation goals.

A high level of knowledge is now available in the extremely relevant field of underground gas emissions from coal mines. However, there are still tasks seeking improved solutions, such as prediction of gas emissions, choice of the most suitable panel design, extension of predrainage systems, further optimization of postdrainage systems, …