longwall system

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
for shafts) full pneumatic fill was used for gently inclined coal layers, whereas steeply inclined ones were mined with longwall system, full dry fill and wooden roof support(Piatek and Piatek, 2002).
As it mines across the face, the coal drops onto a face conveyor at the base of the longwall system. The mine roof above the machine is temporarily supported by hydraulically-operated self-advancing roof supports.
Among the Joy exhibits at MINExpo in October were components of a complete longwall system, consisting of a J750 ranging arm, line pans 1.50 and 1.75 metre and a medium seam two-leg roof support.
Full production is due to commence in the third quarter of 2001 when installation of its longwall system has been completed.