bord and pillar coal mining ppt in philippines

room and pillar coal mining ppt

bord and pillar coal mining ppt room and pillar mining method ppt Toward Pillar Design to Prevent Collapse of RoomandPillar Mines room and pillar mining method pptRoomandpillar mining accounts for a significant portion of the total mineral production in the United Stat As shown in table 1 evaluation of bord and pillar mining system in mcl coal...

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Board Pillar

Sep 15 2015 0183 32 Board Pillar 1 Step mining It is an adaptation for the case where the dip of the ore body is too big 15o to 30o to use equipment on tires at the same time that its...

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Pillar punching into mine floors also result in trough subsidence Subsidence in Bord and Pillar Mining Flooding of coal mines after abandonment can deteriorate clay bearing lithologies eg Shale which can lead to roof and floor deterioration thereby facilitating closure and rock mass displacements and lead to trough subsidence Subsidence...

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Coal mining methodsCoal mining methods

Coal mining methodsCoal mining methods Room Bord Room Bord --andand--pillar pillar Continuous miner and shuttle car 2222 WongawilliWongawilli method and break line method and break line support Bt LBSL S t BLS 2323 Long all miningLongwall mining...

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Bord And Pillar Mining Working Photos

towards high productivity under a claystone roof - underground COAL Feb 15 2001 their history to find an economic mining method under these initially a Bord and Pillar operation and when the reserves of the inspector commented that the bord was about 22 ft 67m wide and the working height of the coal was to fret and consequent rib and roof falls occurred see Photos 1 2...

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Bord And Pillar Mining Method Pdf

Bord Pillar Method Mining Coal Scribd Basic parameters of bord and pillar mining system 1 gallery bord 2 pillar 3 junction calculation of percentage of extraction during development if coal from the full seam thickness is extracted the percentage of extraction during development is nearly 20 in deep mines and 35 in shallow min Online Chat...

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COAL MINING IN INDIA National Coal Development Corporation NCDC was set up in 1956 It was the first major step towards planned development of Indian Coal Industry Coking coal mines were nationalized in 1971-72 Non-coking coal mines were nationalized in 1973 On 1 November 1975 a new public-sector company...

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Digging deeper Mining methods explained Anglo American

The underground mining methods we use include room and pillar narrow vein stoping and large-scale mechanised mining Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds We use this for mining coal...

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21 Bord and Pillar working method 6 22 Pillar Failure 7 23 Effect of mining method on pillar strength 8 24 Basic principles of pillar design 8 25 Pillar Strength Formulas 15 26 Factor of Safety 20 27 Size of pillars 21 28 Laboratory Techniques 22 3...

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CHAPTER 11 Mining Technology

derground coal mining technologies in the West including 1 capital require- ments 2 resource recovery 3 labor 4 production and productivity 5 envi-ronmental impacts and 6 health and safety A number of technological innovations have been developed recently for under-ground coal mining...

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Bord Pillar Method Mining Coal

Basic parameters of bord and pillar mining system 1 Gallery bord 2 Pillar 3 Junction Calculation of percentage of extraction during development If coal from the full seam thickness is extracted the percentage of extraction during development is nearly 20 in deep mines and 35 in shallow min...

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PDF Productivity Improvement in Underground Coal Mines

than 90 of coal is o btained by t he bord and pillar method the predo minant method of mining followed in India and the rest is mined by the lo ngwall mining met hod...

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Bord and Pillar Coal Cutting Machine Mining

Jan 22 2014 0183 32 Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut Overcut or Middlecut to provide free face for the blasting operation Development by CCM The headings are Undercut Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted...

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and room and pillar al mining ppt

room and pillar coal mining ppt - mobilistico room and pillar coal mining ppt Room And Pillar Coal Mining Ppt polrecreatienl 2 Room BordandPillar mining or continuous mining method It is the most common supported pillar method designed and used primarily for mining flatlying seams or tabular orebodies or gently dipping bedded ore deposits of limited thickness like coal oil shale limestone...

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shearer mining ppt

ppt for continuous mining in bord and pillar PPT In traditional longwall mining the shearer travels along the face of the coal seam cutting as it goes and dropping coal onto an armored face conveyor AFC that carries it to a belt or crusher When a cut is complete the whole system moves forward one step at a time until the seam is finished...

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Pillar design in coal mines

May 06 2011 0183 32 Classic empirical pillar strength formulas usually follow one of two general forms where σp= pillar strength σp = strength of insitu coal or rock W = pillar width H= mining height α and β are regression constant and K = a constant depending on the fieldPillar strength formulas by Obert and Duvall 1967 and Bieniawski 1968 Sheorey...

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Coal mining

Coal mining - Coal mining - Choosing a mining method The various methods of mining a coal seam can be classified under two headings surface mining and underground mining Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods and the choice of which method to use in extracting a coal seam depends on many...

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Bord and Pillar method of mining Bord and Pillar method of mining is one of the oldest methods of mining The success of Bord and Pillar mining is selecting the optimum pillar size If the pillars are too large then the extraction ratio decrease leading to less production and profitability and if...

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Bord And Pillar Mining Method Pdf

Bord And Pillar Mining Method Pdf Subsco Machinery is a total solution provider and large exportor for crushing and grinding equipments With excellent product quality and good after-sales service it has been highly praised in domestic and overseas markets and won the favor of...

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187 Longwall PPTs View free download PowerShow

US Underground Mining Equipment Industry to Provide USD 43211 Million Revenue Post 2016 - US Underground Mining Equipment Industry Information by Type of Mining Longwall Extraction and Room Pillar Extraction by Application Coal Mining Metal Mining and Mineral Mining and Region - Forecast to 2022...

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Room and pillar mining

Room and pillar variant of breast stoping is a mining system in which the mined material is extracted across a horizontal plane creating horizontal arrays of rooms and pillars To do this rooms of ore are dug out while pillars of untouched material are left to support the roof overburdenCalculating the size shape and position of pillars is a complicated procedure and is an area of...

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ppt on coal mining crushung grinding

coal mining process in Philippines ppt coal mining process in india ppt bord and pillar coal mining ppt jainindia bord and pillar coal mining ppt ppt for Gangue crushingprocessing Gangue crushing processing Coal gangue is a solid waste in coal mining and coal washing process And Support Online Coal SlideShare Coal 1 get price...

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PDF Underground mining Methods

A coal mining method that accounts f or less than 1 of deep coal production Shortwall involves the use of a continuous mining machine with mov eable roof supports similar to longwall...

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Room and pillar mines Mining Techniques Underground

Room and pillar Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving pillars of unscathed material to support the overstrain leaving open regions or rooms underground...

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Longwall Mining

Dilip Kumar Deepak Kumar in Management of Coking Coal Resources 2016 62102 Underground Mining Greater use of longwall mining replacing bord-and-pillar mining will improve resource recoveryIn case of thick seams sublevel caving hydraulic mining and multislice longwall methods deserve special attention...

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Identifying Optimal Mining Sequences for Continuous

Room-and-pillar mining has obvious geometric constraints ie Cut 5 cannot be mined until Cut 1 and Cut 3 have been mined Safety regulations dictate other clear constraints ie Cut 1 and Cut 3...

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Mining Terms Explained A to Z Anglo American

Learn about mining with this dictionary full of mining terms methods from base metals to stopes more...

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