coal mining

(redirected from coal mine)
Also found in: Dictionary, Thesaurus, Wikipedia.
Related to coal mine: canary in a coal mine

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 ?
Auction of coal mines for sale of coal is expected to bring efficiency into the coal sector due to increased competition and deployment of best possible technology into the sector.
Such untoward incidents are common in the coal mines of Balochistan due to lack of safety arrangements in the mines.
The impact of the Molave coal mine expansion would likely be felt fully in 2017, Consunji said.
However, the number of deaths has been on the decline as 931 people were reportedly killed in coal mine accidents in 2014, compared with 7,000 in 2002.
9 and was still being renewed at present, said Shangguan Qing, head of the county's coal mine administration bureau, adding that the coal mine is suspected of illegal mining.
Quang Ninh was last week hit by the heaviest rain recorded in 40 years, with up to 800 millimetres (31 inches) in some areas, causing flooding, landslides and toxic sludge spills from coal mines.
Soma Coal Mining Industries became infamous on May 13, 2014, when the 301 miners died in an explosion and blaze at the Soma coal mine.
The awards were presented on behalf of the Virginia Mine Safety Board for coal mines and the Virginia Transportation and Construction Alliance for mineral mines.
Since then, the coal mine at Benga has been brought to production.
Also, the Iranian flag at the country's embassy in Ankara was flown at half mast on Wednesday to show respect for the victims of Tuesday's explosion in a coal mine in Turkey.
China: A gas blast in a northeast China coal mine killed 28 people, authorities said Saturday, according to state media, the latest incident to damage the industry's notoriously poor safety record.
a leading mineral exploration company in Brazil, will mutually engage in mining and selling resources of the IP coal mine, jointly holding IP coal mining interests on a 50/50 basis.