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 ?
They said efforts were also being made for exploration of tertiary coal in Central Salt Range, Punjab aimed at meeting the growing domestic energy demand and develop coal fields and increasing power generation.
Construction manager of the power plant Zia Shaikh and the Site Engineer Block-II Thar Coal Field Saghar Ghothari said in a press statement that Thar Coal Project is among the largest Public-Private Partnerships in Pakistan's history.
After completion the Thar coal field will be helpful in ushering new era of development and prosperity in the country.
This particular case relates to the misselling of a coal field in the eastern state of Odisha in 2005 to Hindalco, owned by billionaire industrialist Kumar Mangalam Birla, when Singh also held the charge of the Coal Ministry.
The summons relates to the allocation of a coal field in 2005 to Hindalco Industries, part of the $40 billion Aditya Birla Group.
A group of parliamentarians headed by Kojobek Ryspayev visited Kara-Keche coal field in Jumgal district of Naryn region on October 21 to meet with governor of Naryn region Amanbai Kaiypov, Head of the Kyrgyzkomur State Enterprise Mirlan Jakypov, representatives of the regional and district authorities, and others.
The coal field under Jharia is India's most important source of industrial-grade coking coal and meets the majority of the country's needs.
Mach, So-range-Degari, and Chamalong coal fields were selected and further subdivided as M1,M2,andM3 at Mach coal field, SD1, SD2 and SD3 at So-range-Degari and C1, C2 and C3 at Chamalong coal field.
Again, dissecting the earlier SA model of cheap energy, it is distressing to admit that after 23 years of talk talk talk, we have not made one tangible move to develop our own substantial coal field located in the Aranos district.
This coal field is located within Harnai-Duki-Musakhel coal belt, which is being excavated at many places.
Whereas many major coal mines in Japan have disappeared after the fuel source was largely replaced by petroleum and less expensive coal imports, the Ishikari coal field in Hokkaido continues to operate, and has even produced its largest yield.
These include a 200 km road connecting Thar coal field to Karachi via Thatta and Badin.