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Support Design during Depillaring Operation in Bord and ...

There are two types of the support system are used in underground Bord and Pillar mining named as active and passive. Cog, chock, props are falling into the category of active support while rock bolt is a passive type, utilizing the rock strength by applying internal reinforcing stresses.

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Mechanisation in Indian underground coal mines: rock ...

Mechanised mining, using Continuous Miner (CM) bord and pillar sections, has been successfully introduced into Indian coal mines for more than a decade. This milestone was possible only with the concurrent introduction of advanced technology with rock bolting to provide reliable safe support.

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Design of Bord and Pillar method in coal mines - SlideShare

Feb 27, 2016 · DESIGN OF BORD AND PILLAR WORKING The main elements of Bord and Pillar workings are as follows – 1. Size of the Panel 2. Size of the Barrier 3. Size of Pillars 9. 1. SIZE OF THE PANEL The main consideration in deciding the size of the panel is the incubation period of the coal seam.

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Logistic regression model for prediction of roof fall ...

Logistic regression model for prediction of roof fall risks in bord and pillar workings in coal mines: An approach Sanjay Kumar Palei*, Samir Kumar Das Department of Mining Engineering, Indian Institute of Technology, Kharagpur 721 302, India

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bord and pillar mining - accinsa

Bord and pillar mining Next. This diagram shows the traditional method of bord and pillar mining. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit.

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Assessing Pillar Geometries in the Witbank and Highveld ...

based predominantly on the bord and pillar method of mining. In the late 1970's and 1980's longwall mining methods, based mainly on European practice and equipment, were introduced but for a number of reasons, including high capital cost and the geology of the coalfields, they found only limited application. Galvin (1981) gives insight to the

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bord and pillar coal mining - giardinobagoda

Bord-and-pillar mining in inclined orebodies - SAIMM. bord-and-pillar mining in narrow tabular steep dipping orebodies will depend on the extent of the research and development efforts which need to create and innovate technologies to overcome some of the current limitations stated .

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bord and pillar mining - accinsa

Bord and pillar mining Next. This diagram shows the traditional method of bord and pillar mining. Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof. Then the outer pillars were mined, leaving the roof to collapse in a controlled way as miners retreated to the exit.

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An Economic Study of Retreating Longwall Mining Versus ...

This paper describes the economic study of longwall versus bord and pillar mining using all continuous miners for a colliery located at the South Coast district of New South Wales, Australia. In this district longwall mining appears to be a better economic proposition than bord and pillar. The internal rate of return on investment is...

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Environmental impacts associated with an abandoned mine in ...

Bord and pillar mining started in 1908. The average pillar size left behind was 6×6 m and the average bord width was 7 m, so the extraction ratio was approximately 60%. The average mining depth was in the region of 18–20 m, with a mining height of 2.5 m.

nevid method of extracting pillars - keuken310

EVALUATION OF BORD AND PILLAR MINING SYSTEM IN . proposed mine, extraction of the desired materials. One of such methods is the 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.

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Bord-and-pillar mining in inclined orebodies - SAIMM

Bord-and-pillar mining was then compared to conven-tional mining according to the following: financial analysis, dilution and flexibility. Conclusions could now be drawn to the appropriateness of bord-and-pillar mining in Vlakpoort and Moddergat. Results Geology of Vlakpoort and Moddergat The UG2 Chromitite Layer sub-outcrop strikes approximately

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Underground coal mine by Indian minerology - YouTube

Oct 09, 2017 · Once room and pillar mines have been developed to a stopping point (limited by geology, ventilation, or economics), a supplementary version of room and pillar mining, termed second mining or ...

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Life and design of bord-and-pillar workings affected by ...

Life and design of bord-and-pillar workings affected by pillar scaling by M.D.G. Salamon*, M.U. Ozbay#, and B.J. Madden† Synopsis It has been noted in recent years that the pillars in some bord-and-pillar workings scale or spall. In due course this process may result in the collapse of the affected panels. This paper presents a

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Logistic regression model for prediction of roof fall ...

In underground coal mining, bord and pillar is the method of working, mostly preferable for flat tabular deposits in thin seams, where bords or galleries are driven in the solid coal to form pillars in the development workings. 'Pillars' of coal are left behind to support the roof and prevent collapse.

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Subsidence in coal mines - SlideShare

May 06, 2011 · Subsidence in coal mines 1. ... critical, super critical Method of Working – Bord & Pillar, longwall Rate of Face Advance Backfilling of the Gob Time Elapse Structural Characteristics of buildings, monuments etc Fig: Effect of Dip of Coal Seams Fig: Subsidence in Multiple Coal Seams 8 ... Subsidence Measurement Various subsidence monument ...

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GC26WA7 Gibson County Coal (Earthcache) in Indiana, United ...

Apr 15, 2010 · Gibson County Coal (GC26WA7) was created by indymonk on 4/15/2010. ... 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 point (limited by geology, ventilation, or economics), a supplementary ...

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bord and pillar coal mining ppt - greenplanetfax

bord and pillar mining working photos . 201342 in underground coal mining, bord and pillar is the method of working, mining equipment to gold ore . More Info > Live Chat bathopele mine, rustenburg technology. mining method underground. loion bathopele mine geology. mining activity at bathopele involves the bord and pillar mining layout in . Get ...

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Bord and Pillar Methods. | Coal, Colliery and Mining Forum.

Books and Papers, Reviewed or For Sale, Items For Sale. The Message Board. The Bathrooms.

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