mines in india with bord pillar method

Bord-and-pillar mining explained | Illawarra Mercury ...

May 31, 2017· Two main methods of extraction are used for underground coal mines in New South Wales: longwall and bord-and-pillar extraction. Bord-and-pillar extraction is the older of the methods.

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Bord-and-pillar mining in inclined orebodies

In this case the method is bord-and-pillar mining which originates from the coalmines. Bord-and-pillar mining comprises excavating boards and leaving a grid of pillars at predetermined intervals for stability purposes.

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bord and pillar mining india

Most of the bord and pillar method of coal mining has been done in depth range less than 300 m as at greater depths pillars experience crush. However, in India in some cases the depth of mining for bord and pillar method has been around 600 m, though mining .

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Can bord and pillar fly in Australia? - MiningMonthly

THE bord and pillar method is widely used for coal production in South Africa and has developed in efficiency and productivity in recent years. Mining Consultancy Services managing director of Australia Chris Wilkinson says a review of underground mining practices could find bord and pillar conducive to Australian conditions.

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Bord And Pillar Mining Method Pdf

Mining can be done in two ways, underground and open cast. Underground mining broadly consists of two types, a Long wall method and b Bord Pillar method. The latter is predominantly followed in India compared to the former. Most of the coal mining is done by the Bord and Pillars Method

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OPTIMUM UTILISATION OF CONTINUOUS MINER USED FOR .

tons of coal reserves are locked up in the form of coal pillars in India. Varying geo-mining conditions make it extremely difficult to extract more than 30 percent of the total coal reserve by Bord-and-pillar method, which is again the most popular method adopted in India. In fact, these reasons lead

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OPTIMUM UTILISATION OF CONTINUOUS MINER USED FOR .

tons of coal reserves are locked up in the form of coal pillars in India. Varying geo-mining conditions make it extremely difficult to extract more than 30 percent of the total coal reserve by Bord-and-pillar method, which is again the most popular method adopted in India. In fact, these reasons lead

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Depillaring: Arrangement, Precautions and Pillar ...

Engineering Notes India Huge Collection of Essays, ... After pillars have been formed on the bord and pillar system, consideration has to be given to the extraction of coal from the pillars; the operation is known as pillar extraction. ... Improper mining methods that .

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Pillar design in coal mines - LinkedIn SlideShare

May 06, 2011· PILLAR LOADING • Estimation of loading on the pillar of Bord and Pillar mines based on tributary area loading concept. (C1 xC 2 )σ L = γgH (w 1 xw 2 ) Fig: Tributory Loading Concept 3 ... typically in the 0.5 to 2 range. It is a noncaving room-and pillar method in that panel pillars are not meant to fail during retreat mining. Fig ...

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Pillar Extraction | SpringerLink

Abstract. Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar extraction methods, with numerous ...

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Design of Bord and Pillar method in coal mines

Feb 27, 2016· Bord and Pillar method of mining is one of the oldest methods. 3. INTRODUCTION In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods. The other countries where Bord and Pillar method predominates are Australia, The USA and South Africa.

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Room and pillar mining - Wikipedia

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 overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of ...

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Bord and Pillar mining by continuous Miner in HINDI - YouTube

Jul 29, 2016· Bord and pillar is an underground mining method for extracting coal from belowground of earth. Various machinery combinations are used for extracting. One of the combination is the continuous ...

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Logistic regression model for prediction of roof fall ...

Five underground coal mines are considered for the pur-pose of study and data are collected from those mines. All the mines have bord and pillar method of workings. Out of the five mines, three are located in Eastern India (relevant data collected from these mines from 1991 to 2004) and two are in Southern India (relevant data collected from

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COAL MINING TECHNOLOGY - e-library WCL

•Bord & Pillar is the traditional mining method used in India. •It is employed where geo-mining conditions are complex. •Coal is removed from the coal faces initially by developing a set of galleries leaving pillars in between to support the roof. •Thereafter, the pillars are extracted by de- pillaring.

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bord and pillar mining method

Bord and Pillar method of Mining Bord and pillar mining method comprises two phases DEVELOPMENT and ... The bord and pillar mining can be done in three ... Get Price; bord and pillar mining BINQ Mining. This diagram shows the traditional method of bord and pillar mining. ... Room and pillar is also known as bord and pillar is a mining system in ...

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COAL MINING TECHNOLOGY - e-library WCL

•Bord & Pillar is the traditional mining method used in India. •It is employed where geo-mining conditions are complex. •Coal is removed from the coal faces initially by developing a set of galleries leaving pillars in between to support the roof. •Thereafter, the pillars are extracted by de-pillaring.

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Longwall Mining - an overview | ScienceDirect Topics

At present, production by longwall mining accounts for a minor amount of total underground mining production with the majority coming from bord-and-pillar methods. Since it is envisaged that longwall mining will require time to become established in India, bord-and-pillar methods will continue to be dominant in the foreseeable future.

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(PDF) APPLICATION OF DIFFERENT PILLAR EXTRACTION METHODS ...

In India, Coal mining is carried out by both opencast and underground methods, where opencast mining contributed about 93.69% of the total production, whereas the underground mining contributed ...

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DEVELOPMENT OF SOFTWARE TO EVALUATE ROOF FALL RISK .

India and is listed in Table 1 year wise [2]. Accidents due to fall of roof occurred in the same proportion in bord and pillar development as well as depillaring methods. In underground coal mines, bord and pillar is one of the oldest method used for extraction of flat and tabular coal seams. Pillars are left behind to support the roof and

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Desinging coal mine development galleries for room and ...

ABSTRACT: Most of the about 300 underground coal mines in India operate with room and pillar mining method using drill and blast cyclic operations. Output per man shift from these mines has been stagnant since decades and a cause of concern. Introduction of continuous miner technology, though

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Characterization of coal mine panels in bord and pillar ...

of the mines in India are worked by the bord and pillar method of mining, our model has been designed for this method to serve a maximum number of mines. Among the systems of extraction in the bord and pillar method, depillaring with formation of small pillars as final operation, extraction by broadening galleries, depillaring with hydraulic

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EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL .

In the U.K, former USSR, France and other European countries longwall method of coal mining is the main method of mining. In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods.

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bord and pillar mining method - casadicurascarnati

Of the total output of coal from underground mines, more than 90% of coal is obtained by the bord and pillar method, the predominant method of mining followed in Jamaica, and the rest is mined by the longwall mining method The Indian coal mining industry has witnessed a persistent decline in underground coal production over the years with more.

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