coal mining

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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 ?
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.
The coal mine and assets are located strategically in the prime coking coal bearing region of the Moatize Coal Basin which is stated to be the second largest coal basin in the world after the Bowen Basin in Australia.
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.
Six of them escaped before the water entered the coal mine.
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.
The men were found shortly before noon in a flooded shaft of the Xinqiao Coal Mine and were immediately brought to the surface where they were administered IV drips to restore their energy, the report said.
Jellinbah East Coal Mine currently produces PCI coals at approximately 4.
It was the nation's deadliest coal mine accident in seventeen years.
and the Liaoning Fuxin Coal Group of Northern China have selected the HaiZhou coal mine as the first coal mine in China to use the Hybrid Coal and Gas Turbine (HCGT) power plant technology.
Particularly outstanding in the first group of coal papers are an overview on the effects of longwall mining on aquifers (Booth), and a case study on the assessment, prediction and management of long-term, post-closure water quality at a South African coal mine (Hattingh et al.
PT Timah will exploit coal deposits in Kalimantan in a small-scale coal mine with a production capacity of 1 million to 2 million tons a year.
A coal mine isn't worth working unless most of what is pulled from the ground is coal.