Longwall Mining Overview | Introduction | underground

LONGWALL MINING Overview In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face

Room and pillar mining Wikipedia

Room and pillar mining was one of the earliest methods used, although with significantly more manpower The room and pillar system is used in mining coal, gypsum, iron, and uranium ores, particularly when found as manto or blanket deposits, stone and aggregates, talc, soda ash and potash

Long Wall And Pillar Mining

long wall and pillar mining Mining Mar 07, 2013 · Long wall or Room and Pillar MiningWhich one to Chose?Coal September 9, 2010 (Coal Geology): Most of the underground mines in the USA uses Long wall or Pillar and Stall (Room and Pillar), or by some modification of one of

Coal Mining Methods

Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and roomandpillar mining are the two basic methods of mining coal underground, with roomandpillar being the traditional method in the United States Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of

Longwall mining SourceWatch

26/06/2017· Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 12 m thick) The longwall "panel" (the block of coal that is being mined) is typically 34 km long and 250400 m wide Longwall mining produced 176 million tons of coal in 2007, about 15 percent of total US production

Principles of Longwall Mining

10/09/2012· This video provides a basic description of the longwall mining method for extracting coal underground It includes an explanation of the different products/key components of a longwall mining

Caterpillar Global Mining

Principles of Longwall Mining

12/04/2016· This video provides a basic description of the longwall mining method for extracting coal underground It includes an explanation of the different products/key components of a longwall mining

Wyoming Machinery Company

NSW Mining Methods NSW Mining

Underground mining accounts for 60% of world coal production, but is less common in NSW, making up around 35% of raw coal production This method is also used to mine metallic minerals like gold and copper The two main types of underground mining in NSW are bordandpillar and longwall mining

Longwall mining SourceWatch

26/06/2017· Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 12 m thick) The longwall "panel" (the block of coal that is being mined) is typically 34 km long and 250400 m wide Longwall mining produced 176 million tons of coal in 2007, about 15 percent of total US production

Longwall Mining an overview | ScienceDirect Topics

Longwall Mining Longwall mining is the removal of coal from one, long continuous face rather than removing it from a number of short faces, which occurs in room and pillar mining or pitch mining

Roomandpillar mining | coal mining | Britannica

In mining: Roomandpillar mining The most common mining system is roomandpillar In this system a series of parallel drifts are driven, with connections made between these drifts at regular intervals When the distance between connecting drifts is the same as that between the parallel drifts, then a Read More

Fact sheet Subsidence from longwall coal mining

Subsidence from longwall coal mining (PDF 56695 KB) Subsidence is a localised lowering of the land surface It occurs when underground voids or cavities collapse, or when soil or geological formations (including coal seams, sandstone and other sedimentary strata) compress due to changes in moisture content and pressure within the ground

Study measures the environmental impacts of longwall

27/04/2010· While underground longwall mining does not have the same, obvious impacts of opencut mining on surface environments, it can nevertheless cause

Longwall mining | Article about longwall mining by The

Whereas traditional bordandpillar mining had little or no impact on the surface, a collapse of 3 m in the roof of a mine during longwall mining at a depth of 300m causes subsidence of the surface by about 2m, that propagates in wavelike form as a longwall extends

Room and Pillar Mining Method Newtrax Technologies

Room and Pillar Mining Method In Room and Pillar mining, the coal seam is mined in a checkerboard style leaving pillars of coal to support the roof which allows for instant coal access with a relatively low invest compared to long wall mining, however, only utilizes the coal reserves between 50

Types of Underground Mining Method Comparison

Longitudinal Back, FlatBack Mining Method LongWall StopingmMining Method After starting an overhand stope the shape in which the back is carried is often of prime importance In A, Fig 2, is illustrated the method of carrying a flat or longitudinal back (the term longwall is used sometimes when the vein lies nearly flat) In this method

Toward Pillar Design to Prevent Collapse of Roomand

longterm performance of roomandpillar mines are described INTRODUCTION Roomandpillar mining accounts for a significant portion of the total mineral production in the United States As shown in table 1, well in excess of $6 billion worth of mineral commodities are produced each year by this method A substantial portion ($355 billion) of coal production still comes from roomandpillar

Comparison of Advancing and Retreating Longwalls

Comparison of Advancing and Retreating Longwalls The advantages of retreating longwalls compared to advancing are: Gate road formation is remote from face operations (less congestion at face ends, less supplies into longwall face area, face not held up waiting for gate road preparation or vice versa, no problems of dust production from gate road workings affecting longwall personnel)

Underground Mafia Room & Pillar and longwall mining

Room & Pillar and longwall mining method explained Room and pillar and long Wall mining Ruben Pillar is a mining method involving the extraction of coal that forms a series of rooms while leaving pillars or columns of coal to help support the mind roof The rooms are generally 20 to 30 feet wide and the remaining pillars are 20 to 90 feet wide as production advances A gridlike pattern

Room and Pillar Mining an overview | ScienceDirect Topics

Long wall mining is a mostly automated process whereby longwall mining machines are used to extract blocks of deposits as wide as the face of the equipment, and potentially kilometers long Cutters are then used to cut the deposits from the face of the equipment Room and pillar mining is a common underground mining method for mining oil shale

Design of Bord and Pillar method in coal mines

27/02/2016· APPLICABILITY OF BORD AND PILLAR METHOD The Bord and Pillar method is adopted for working 1 A seam thicker than 15 m, 2 A seam free from stone or dirt bands Stone or dirt bands, if present in a seam, can be easily disposed of for strip packing in long wall advancing method of mining 3 Seams at moderate depth, 4 Seams which are not gassy

Longwall Mining

Longwall mining is a high extraction technique where coal is removed in 1,400 ft panels that stretch for miles Unlike traditional room and pillar mining, in a longwall mine no coal pillars are left in place to provide surface support above the panel Hydraulic supports are used to hold the roof up at the working face of the coal seam As the

Lecture 4: Underground Mining SlideShare

2/11/2011· Underground mining, Underground mining methods Lecture 4: Underground Mining 1 Hassan Z Harraz [email protected] 2010 2011 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors

Joy Global explains underground coal mining

8/04/2012· This video by mining equipment manufacturer Joy Global, more educational than promotional, gives an excellent overview of longwall, versus room and pillar underground coal mining techniques The

Introduction to Longwall Mining and Subsidence ver2

In longwall mining, a panel of coal, typically around 150 to 300 metres wide, 1000 to 3500 metres long and 2 to 5 metres thick, is totally removed by longwall shearing machinery, which travels back and forth across the coalface A typical section through a coal face is shown in Fig 12 and a photograph of typical

Cat scales back room and pillar business

20/10/2016· Caterpillar (NYSE:CAT) is moving away from room and pillar mining, a business that services mostly coal companies in the US Tom Bluth, the company‚Äôs vicepresident of surface mining

Pillar design incoalmines SAIMM

Role ofBordandpillar Mining Arecent study byKing1hasshown that, despite the increase inrelative importance ofopencast and longwall mining methods, bordandpillar mining islikely toremain themostimportant method ofcoalextraction formany years tocome

Environmental Science Chapter 16 Flashcards | Quizlet

Start studying Environmental Science Chapter 16 Learn vocabulary, terms, and more with flashcards, games, and other study tools

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