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Universalium. 2010.
longwall — /lawng wawl , long /, adj. Mining. 1. noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial… … Useful english dictionary
Longwall mining — is a form of underground coal mining where a long wall (typically about 250 400 m long) of coal is mined in a single slice (typically 1 2 m thick). The longwall panel (the block of coal that is being mined) is typically 3 4 km long and 250 400 m… … Wikipedia
Longwall Street — is a street in central Oxford, England. It runs along the western flank of Magdalen College, separated by an imposing and high 15th century stone wall for the length of the street, behind which is the deer park in the college. The street is… … Wikipedia
Longwall mining — An automated form of underground coal mining characterized by high recovery and extraction rates, feasible only in relatively flat lying, thick, and uniform coalbeds. A high powered cutting machine is passed across the exposed face of coal,… … Energy terms
longwall system — ˈ ̷ ̷ˌ ̷ ̷ noun Etymology: longwall from long (I) + wall : a method of coal mining in which the working face extends entirely across the seam, the work proceeds either away from or toward the main shaft, and the roof is allowed to cave in behind… … Useful english dictionary
longwall mining — /lɒŋwɔl ˈmaɪnɪŋ/ (say longwawl muyning) noun the system by which coal is extracted from a long continuous face …
coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… … Universalium
Coal companies of Australia — Contents 1 Anglo Coal Australia Ltd 1.1 Anglo Coal Callide Mine 1.2 Anglo Coal Capcoal Mine … Wikipedia
Coal mining — Men leaving a UK colliery at the close of a shift Surface coal mining in Wyo … Wikipedia
Underground mining (soft rock) — refers to a group of underground mining techniques used to extract coal, oil shale and other minerals or geological materials from sedimentary ( soft ) rocks. Because deposits in sedimentary rocks are commonly layered and relatively less hard,… … Wikipedia
