coal mining

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Related to Mining coal: colliery, Underground coal mining

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 ?
Sindh CM maintained, "We are going ahead and by mining coal, power plants will be installed, while Sindh possesses resources of 100 years where about 50,000 to 60,000 people will work in a single power plant of a block.
Higher global coal prices mean mining coal at home is now more economic.
Like many communities once devoted to mining coal, the Northumberland village really would benefit from regeneration.
But mining coal in Appalachia, as Erik Reece documents in Lost Mountain, remains at least as destructive as clearcuts in Oregon or oil spills in Alaska.
Mining coal can also be a messy business, carving scars into the Earth, releasing clouds of dust, leaving behind sources of acidic water that can persist decades after a mine closes, and requiring dams--"impoundments" in industry lingo--that sometimes break and ravage miles of waterways.
Sojitz to start mining coal at Australia's Minerva in FY 2005
Heavy dependence on surface operations for mining coal may lead to a situation, in the not-too-distant future, where further production growth would have to rely mostly on underground mining.
Lest anyone get the idea of mining coal for its diamonds, it would take about a quadrillion (1015) of these nanodiamonds to equal the volume of a 1-carat solitaire.
Krupp says that, apart from the primary application of mining coal and partings, the KSM 4000 can be used for berm construction and removal, topsoil removal, floor-coal cleaning, and road and ramp construction.
That's an exaggeration; judging from Wilkinson's description, cutting sugarcane in Florida doesn't sound as dangerous as, say, mining coal in Pennsylvania.
ECEI had for the past two years been leasing coal and development of commercial mining and producing coal and has been mining coal since September 2003.
Part 6 - Provision of heavy equipment for the needs of SRK SA Branch in Dabrowa Mining Coal Mines in complete liquidationDetailed description of the contract and its scope and the modalities of technical and organizational in Annex 2 to the Terms of Reference.

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