typical oreflow system in a bord and pillar coal mine

CHAPTER 11 Mining Technology

tial capital cost The cost of a typical longwall installation is $9 million; total capital cost of the technology per ton of coal mined over the life of a system is about $1,50 This compares to a capital cost of $040/ton of coal mined over the life of the system for the typical room-and-pillar operation in the West, using continuous miners ....

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Principles of Longwall Mining

12042016· This video provides a basic description of the long-wall mining method for extracting coal underground It includes an explanation of the different products/key components of a long-wall mining ....

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Pillar design

A stiff system with a softer pillar will allow the soft pillar to crush and not fail violently, whereas a stiffer pillar than loading system cannot crush, and will have excess stored strain energy The following pictures represent the different load deformation curves based on pillar and mine characteristics [7] :...

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Glossary of Mining Terms

Pillar - An area of coal left to support the overlying strata in a mine; sometimes left permanently to support surface structur Pillar robbing - The systematic removal of the coal pillars between rooms or chambers to regulate the subsidence of the roof Also termed "bridging back" the pillar, "drawing" the pillar, or "pulling" the pillar...

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Principles of Room & Pillar Mining

10092012· This video provides a basic description of the room & pillar mining method for extracting coal underground It includes an explanation of the different products working together in a room & pillar ....

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Surface mining

It is most commonly used to mine coal and lignite (brown coal) Strip mining is only practical when the ore body to be excavated is relatively near the surface This type of mining uses some of the largest machines on earth, including bucket-wheel excavators which can move as much as 12,000 cubic metres of earth per hour...

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Coal Mining Methods

Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United Stat Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of the United Stat Although widely used in other ....

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Coal Mining Methods

Longwall & Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United Stat Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of the United Stat Although widely used in...

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bord and pillar mining india

bord and pillar mining india Posted at:February 26, 2013[ 46 - 3223 Ratings] EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES , For Indian coal mines, CMRI has developed a formula for calculating the safety factor »More detailed Geotechnical investigation for support design in depillaring , In India, Bord ,...

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Tahmoor Coking Coal Operations

The primary method of coal extraction at the Tahmoor Coking Mine until 1987 was Bord and Pillar mining, after which longwall mining was introduced The majority of coal is now extracted from the mine using the longwall mining system, with a much smaller part coming from the mine development The CHPP is able to process 650 tonnes per hour and ....

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Coal mining

Most coal seams are too deep underground for opencast mining and require underground mining, a method that currently accounts for about 60 percent of world coal production In deep mining, the room and pillar or bord and pillar method progresses along the seam, while pillars and timber are left standing to support the mine roof Once room and pillar mines have been developed to a stopping ....

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Room and Pillar Mining

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Room and pillar mining

Room and pillar mining was one of the earliest methods used, although with significantly more man-power 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...

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Pillar design in coal mines

pillar design in coal mines, different pillar design approaches, salmon versus sheorey formulae, panel stability, diffrent approaches, local mine stiffness Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising...

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