coal mining

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Related to Coal field: oil field, Natural gas field

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 ?
CCTEG will carry out geological exploration of coal fields, will provide equipment, develop feasibility study for construction of the mineral fertilizers plant in Tash-Komur, Jalal-Abad region, at Tegene coal field, the Agriculture Ministry said.
The coal field is estimated to have a reserve of over 4 billion tonnes of lignite coal, which constitutes nearly 45% of Turkey s total reserves.
Trumka credits the union's success in gaining it breakthrough on its information request "to the solidarity and discipline of UMWA families all across the coal fields.
He said the water from Thar coal field can be desalinated for drinking and irrigation purposes.
Trumka's remarks came in response to Peabody newspaper ads which appeared in various coal field communities this morning.
Establishment of a contractor with the Kyrgyzkomur is being considered for the joint development of the Kara-Keche coal field.
Previously, he founded Madagascar Oil and Red Island Minerals (RIM) and is the originator of their projects which are the development of multi-billion barrel heavy oil fields and a major coal field respectively.
Chief Minster Sindh informed him that comprehensive plan for the Coal and power project has been prepared and will be supplied to intending investors and there is water facility for drinking purpose and communication system at Thar Coal field.
25 /PRNewswire/ -- The following statement was issued this evening by the United Mine Workers of America in response to advertising purchased by Peabody Coal that will appear Friday in several coal field newspapers.
Ministry of Energy and Industry does not answer on investors' requests for Kara-Keche coal field, Member of Parliament Chynybai Tursunbekov, leader of SDPK faction, said at the Defense Council session on March 18.
Motiwala said that the government has approved a lucrative incentive package for the development of Thar coal and the coal field has been declared as special economic zone (SEZ), offering an IRR of 20.
We have big Kara-Keche coal field, production of gas from coal will require the latest technologies.