longwall


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longwall

(ˈlɒŋˌwɔːl)
n
(Mining & Quarrying) a method of extracting coal from a mine whereby a long wall of coal is mined at one time
References in periodicals archive ?
ENPNewswire-August 23, 2019--Mechel Reports Launch of New Longwall at Southern Kuzbass
"While some mine operators own some pieces of longwall relocation equipment, it doesn't make commercial sense for most mine operators to own a full suite of longwall relocation equipment.
Arch Coal announced that it has commenced development of a longwall mine in Barbour County, West Virginia, that will produce an estimated 3M tons of premium, High-Vol A coking coal annually for sale into an undersupplied global marketplace.
During the U type ventilation of longwalls (with exploitation being carried out under conditions of high methane hazard), the highest methane concentration levels are present in the intersection area between the longwall and the tailgate (the called upper corner of the longwall).
It is common to see roadways laid ahead of workface in longwall mining field practice [1].
Therefore, quantitatively relating the fracturing of the main roof to the change in strain energy in the rock around the longwall not only helps to predict the development of stress-induced dynamic disasters, but also helps to improve future design proposals for pre-reinforcement of the mine roadway.
International Resource News-August 16, 2013--Cumberland Coal resumes operations at longwall mine(C)1994-2013 ENPublishing - http://www.enpublishing.co.uk
Denver, CO, May 31, 2013 --(PR.com)-- Gates Corporation, a global diversified manufacturer of industrial and automotive aftermarket parts, will introduce its patent-pending iLok[TM] coupling for underground coal mines at the 2013 Longwall USA Exhibition & Conference in Pittsburgh, Pa., from June 11-13.
The 29 papers in this collection cover plow technology and its perspectives, and constructing and maintaining opening-out headings for plowing longwall. The emphasis is on technologies in which the miner manipulates the plow to dig out the coal at the seam, and watches the operation on a screen from elsewhere.