coal mining

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Related to Underground coal mine: colliery

coal mining,

physical extraction of coal resources to yield coal; also, the business of exploring for, developing, mining, and transporting coal in any form. Strip mining is the process in which the overburden (earth and rock material overlying the coal) is removed to expose a coal seam or coal bed. Excavators either dispose of the overburden or store the waste material for replacement after the coal has been extracted. Once exposed, the coal is usually removed in a separate operation. Surface soil is often stripped separately and spread back onto the reclaimed surface. The environment can also be protected by seeding or planting grass or trees on the fertilized restored surface of a strip mine. The term strip mining is most often used in reference to coal mining, although the process may also be used to extract certain metallic ores as well. Sometimes the terms open-pit, open-cast, or surface mining are used in the same sense, although they usually refer to metalliferous mining or the mining of other minerals. Underground coal mining is the extraction of coal from below the surface of the earth. The coal is worked through tunnels, passages, and openings that are connected to the surface for the purpose of the removal of the coal. Mechanical equipment breaks the coal to a size suitable for haulage. Alternatively, the coal is drilled, and the resultant holes are loaded with explosives and blasted in order to break the coal to the desired size. In order to protect the miners and equipment in an underground coal mine, much attention is paid to maintaining and supporting a safe roof or overhead ceiling for the extraction openings. Long-wall mining is a method of underground mining believed to have been developed in Shropshire, England, near the end of the 17th cent. A long face, or working section, of coal, some 600 ft (180 m) in length, is operated at one time. The miners and machinery at the working face are usually protected by hydraulic jacks or mechanical props which are advanced as the coal is extracted. The excavated, or gob, area is either allowed to cave in, or is filled in by waste material called stowing. The Anderton shearer is a widely used coal cutter and loader for long-wall mining. It shears coal from the face as it moves in one direction and loads coal onto an armored conveyor as it travels back in the opposite direction. It is ordinarily used for coal seams greater than 3.5 ft (9.1 cm) in thickness.

coal mining

[′kōl ‚mīn·iŋ]
(mining engineering)
The technical and mechanical job of removing coal from the earth and preparing it for market.
References in periodicals archive ?
However, an open pit copper mine in Arizona has very little in common with an underground coal mine in West Virginia.
This is mainly for underground coal mine development including tunnelling capacity of 200,000 metres per year.
Scotland's last underground coal mine, at Longannet, in Fife, closed in 2002.
- Provide full duplex, clear voice communications and tracking as required by law in US underground coal mines. - Provide ample bandwidth to move existing legacy applications onto a single standards-based network, eliminating multiple proprietary networks.
The 2006 underground coal mine incidents and their 19 fatalities marked a reversal of that trend.
A series of laboratory experiments was carried out for these coal measures rock samples before constructing a large-scale 3-D crack distribution model of an underground coal mine.
Mine-mouth projects involve a coal-fired power plant that sits on or next to a surface or underground coal mine. This setup allows companies to capitalize on several logistical and environmental synergies.
The European Commission has approved an aid package worth [pound]17.5 million to the Longannet underground coal mine in Fife, Scotland.
Tenders are invited for Coal Mine Methane (CMM) Drainage and Utilization (Power Generation) of Methane on concept to commissioning basis from Moonidih Underground Coal Mine from Coal seam XVI Top (seam & adjoining areas contributing to methane in the coal face) for safe and successful coal production operation from Longwall panels EMD value : INR 5000000
Ground control-related incidents are still one of the leading injury and fatality reason in underground coal mines. According to statistics from the Mine Safety and Health Administration, there were 35,228 underground coal mine workers in 2015 working either in a longwall or retreat room-and-pillar mine.
Ground control-related incidents are still one of the leading injury and fatality reasons in underground coal mines. According to statistics from the MSHA, there were 35,228 underground coal mine workers in 2015 working either in a longwall or retreat room-and-pillar mine.
3 April 2018 - British-Australian metals and mining company Rio Tinto (NYSE: RIO) has entered into a binding agreement with a consortium comprising private equity manager EMR Capital and Indonesian coal company PT Adaro Energy Tbk for the sale of its entire 80% interest in the Kestrel underground coal mine in Queensland, Australia, for AUD 2.25bn (USD 1.73bn), the company said.

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