longwall system

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longwall system [′lȯŋ‚wȯl ‚sis·təm]

(mining engineering)

A method of mining in which the faces are advanced from the shaft toward the boundary, and the roof is allowed to cave in behind the miners as work progresses.

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No references found			In the stalls, I was told, coal is hewn away from the sides of the tunnels by a method known as the retracting longwall system. Keresley - an old king of coal; OLD COVENTRY VIII by Coventry Evening Telegraph (England) 10) Considered to be more efficient than the room and pillar system, the longwall system increases mine safety by eliminating the need for explosives. The mining machinery industry: labor productivity trends, 1972-84 by O'Neil, Barbara A. / Monthly Labor Review Williams said that building its own longwall systems just made sense for the company. Murray Energy Corporation Launches Subsidiary American Equipment and ... by Business Wire			Longo, Luigi Longs Peak Longshan culture longship longshore bar longshore current longshore drift longshore trough Longstocking, Pippi Longstreet, Augustus Baldwin Longstreet, James Longsuffering Longuet, Charles Longuet, Edgar Longuet, Jean Longueuil Longueuil, Charles le Moyne, sieur de Longueville, Anne Geneviève de Bourbon-Condé, duchesse de Longus Longview Longview Lake Park longwall coal cutter longwall peak stoping longwall pillar working longwall retreating longwall system Longworth, Nicholas Longwy Longyear City Longyearbyen Lonicera Caprifolium Lonigan, Studs Lonnrot, Elias Lönnrot, Elias Lonoke County Lons-le-Saunier Lonsdale, Dame Kathleen lonsdaleite LonWorks loo Loo-choo Islands loofah Look Look Ahead Left-to-right parse, Rightmost-derivation Look ahead LR look and feel look angle look box look-ahead cache look-back time look-through			Longum tempus Longus Longus Longus Longus Longus capitis Longus capitis muscle Longus colli Longus colli muscle LONGV Longview Longview Longview Longview Boys Baseball Association Longview Community College Longview Convention and Visitors Bureau Longview East Texas Amateur Radio Club Longview Fire Department Longview Independent School District Longview Kennel Club Longview Lake Park Longview Trading System Longview/Gladewater/Kilgore, TX, USA - Gregg County Longville Ambulance Subordinate Service District longwall coal cutter Longwall mining longwall peak stoping longwall pillar working longwall retreating longwall system Longwall Top Coal Caving Longwave Longwave Longwave Cloud Radiative Forcing Longwave Club of America Longwave transmitter Longwave transmitter longways longways dance Longwing Real Estate Ventures longwise Longwood Center for the Visual Arts Longwood Court Homeowners Association Longwood Green Campus Initiative Longwood Herbal Task Force Longwood High School Longwood Medical and Academic Area Longwood Symphony Orchestra Longwood University longwool longwool-type longwools Longworth Longworth House Office Building Longworth, Nicholas

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