Risks and challenges affecting opencast pillar mining in …
The paper points out that bord-and-pillar mining is the most important method of coal extraction in South African underground coal mines, and advocates that pillar design procedures should be ...
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Bord and pillar mining in India
@misc{etde_5250611, title = {Bord and pillar mining in India - where do we go from here} author = {Ghose, A K} abstractNote = {Bord and pillar mining is the dominant underground coal mining system in India - of the 74.5 million tonnes produced from underground mines, only 2.1 million tonnes came from longwall operations. The level of mechanised extraction is very low, which …
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Bord & Pillar Mining Methods
The bord and pillar method of mining is suited to work flat coal seams of average thickness and at shallow depths. Coal seams of 1.8 to 3 m thickness are best suited for this method,
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BORD & PILLAR METHOD | Mine Portal
CLICK HERE TO DOWNLOAD NOTES FOR BORD & PILLAR METHOD OF WORKING. Mine Portal - India's Mining Exams Test Series Provider, Mine Portal is the favorite choice of thousands of mining professional …
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STUDY AND REVIEW OF ADVANCE DEPILLARING METHODS USED IN CONTINUOUS
Bord and Pillar mining is the oldest and most popular mining method to extract coal from underground. ... that encounter during depillaring DEPILLARING METHODS USED IN INDIA 9 3.1 Depillaring methods that are following in India 3.1.1 Bord and pillar method 10-16 10-16 10 3.1.2 Blasting Gallery method 13 3.1.3 Long wall method 15 DEPILLARING ...
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Optimum Utilisation of Continuous Miner for …
Indian co alfields, w here caving is p racticed, 60-90 m 2. ... [12] Sri Ram Chandra Nay ak, "Evaluation of bord and pillar mining sy stem in . M CL coal mines", NIT Rourkela, 2010.
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An empirical study of heat flow and temperature rise in bord-and-pillar …
The bord-and-pillar system is the predomi- nant mining method in India. More than 90% of deep-mined coal in India comes from bord-and-pillar workings. The method, al- though simple in terms of extraction technol- ogy, presents serious problems in numerical modelling of air flow and heat flow in the panel.
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Chapter 7 CONCLUSIONS AND SUGGESTIONS
The bord and pillar system is the most commonly used method of underground coal mining in India, in which the mining operation is commenced in two phases, i.e., development and depillaring. The galleries are formed during the development phase leaving pillars, whereas splitting/slicing the pillars has to be carried out in the
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LECTURE NOTES ON UNDERGROUND COAL MINING
MINING METHODS (UNDERGROUND COAL) 1.0 INTRODUTION TO UNDERGROUND COAL MINING : 1.1 Classify Underground Coal Mining Methods. Method of winning coal in …
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DESIGN OF SUPPORT SYSTEM IN BORD AND …
2. Department of Mining Engineering INDIAN INSTITUTE OF ENGINEERING SCIENCE AND TECHNOLOGY, SHIBPUR (An Institute of National Importance) ii CERTIFICATE This is to certify that the dissertation …
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Bord and pillar working with LHD/SDL | PPT
The document discusses mining methods and equipment used for underground coal mining using the bord and pillar method. It provides specifications for various mining equipment used including Load Haul Dumpers (LHDs), Side Discharge Loaders (SDLs), drilling machines, conveyors, haulage systems, and their capacities.
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Department of Mining Engineering
Bord and pillar method is the most widely practiced underground mining method in India. Nevertheless about 61% of underground coal mining accidents are due to roof and side fall of …
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EVALUATION OF BORD AND PILLAR MINING SYSTEM …
For Indian coal mines, CMRI has developed a formula for calculating the safety factor. Generally for Indian ... The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will collapse. If the pillars are too large then significant quantities
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COAL MINING IN INDIA: TECHNOLOGY, CHALLENGES …
In underground coal mines, drilling and blasting with loading by SDL or LHD and transportation by belt conveyors are the common technology in bord and pillar pattern whereas continuous …
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OVERVIEW OF BLASTING GALLERY METHOD IN AN …
Single lift mining is generally limited to heights of 4.8m. However, thick seams are normally mined multi-slices. This is called slice mining, wherein each slice is mined in one pass. Working of each of slice can be either by bord and pillar method or by longwall method. In …
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Chronological development in coal pillar design for bord …
Bord and pillar method of mining coal seam involves driving two sets of parallel inseam headings, one set being orthogonal to another, thereby forming square or rectangular pillars. These …
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A Critical Review of Indian Underground Thick Coal …
namely: Bord And Pillar Base and Longwall System Base. The National Coal Development Corporation (NCDC) was formed in the year 1956 which initiated a number of trails with global cooperation. 2.1.1 Bord and Pillar Based systems: Multi stage/slicing was a variant of conventional bord and pillar method in
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(PDF) Thick Coal Seam Mining
In this paper, the authors highlighted the several issues and challenges faced in different Indian thick seam mining methods in Bord and Pillar (B&P) and its variant like Blasting Gallery, Cable ...
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Guidelines for Pillar design in Bord-and-Pillar operations
For the bord-and-pillar layouts, the pillars are designed to remain stable and the APS needs to be limited to prevent failure of the pillars. Typically, a factor of safety (Fs) is used in the design and this is given by: ... and h is the pillar height (mining height). Equation (6) can be inserted in (5) to give: By assuming that Equation (7 ...
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Sustainability of Underground Coal Mining in India Vis-a' …
Traditional Bord and Pillar system of mining with deployment of SDL/LHD is neither economic nor it can achieve large output, underground mines producing more than 1000 tonnes of coal per day with the said technology are limited few in the entire country. ... Coal mining started in British India with Bord & Pillar method of underground mining in ...
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Introduction Chapter 1
The bord and pillar system is the most popular underground coal mining method in India concerning the geo-mining complexities. The conventional mining practices adopt a cyclic …
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Utilisation of coal gasification in addition of bord and …
Bord and Pillar method: Bord and Pillar method, by which the coal seam is extracted by making intersecting headings that provide coal pillars as a natural support for the development stage and gallery after the pillar has been extracted [1]. Longwall : It is a …
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Support design in underground coal mines using …
Coal mines in India are predominantly worked by bord and pillar mining method where a series of pillars are formed by driving roadways in both parallel and perpendicular direc-tion (Singh et al. 2016). Out of the total coal production in India, 90% is worked by board and pillar mining and the rest 10% by the longwall mining method (Mukherjee and
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Depillaring By Bord And Pillar Method With Stowing …
One of the oldest methods of mining is the Bord and Pillar. It is a method in which the mined material is extracted across a horizontal plane while leaving "pillars" of untouched material to …
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Support design in underground coal mines using modified …
Bord and pillar method of mining continues to be a major operation in India with about 160 mines producing 35 MT of coal. Owing to the exhaustion of near-surface deposits, environmental impacts and land acquisition issues associated with surface mining, underground coal mining is expected to take a leap in the next decade. Weak and layered roof strata in …
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Support Design during Depillaring Operation in Bord …
Department of Mining Engineering, IIT BHU, Varanasi, India (riz.itbhu@gmail) Abstract In an underground coal mine, most successful and economical approach to support the underground structure is roof bolting technology. The most preferred method of working in Indian coal mine is Bord and Pillar.
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Representative coal pillar (size 25 m  25 m corner-to …
Ensuring rib stability during pillar extraction is of prime importance in bord and pillar (B&P) method of underground coal mining with caving.
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Developments Made for Mechanised Extraction of Locked-Up Coal Pillars
Bord and Pillar method of underground mining has been used extensively to develop Indian coal seams into pillars and galleries. This results in only 20–30% recovery of coal and rest coal remain locked up in developed pillars. Indian coalfields are famous in the world for its uniqueness and complexity of the geomining conditions which makes the extraction of the …
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Underground Coal Mining Methods and Their Impact on …
2.4 Room and pillar. In India, underground mining is highly dependent on bord and pillar/room and pillar mining due to their adaptability, flexibility, and accessibility. "room and pillar" mining involves a sequence of activities that are performed to first enter and develop the mine and then progressively extract the coal.
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Developments made for mechanised extraction of locked-up coal pillars
Bord and Pillar method of underground mining has been used extensively to develop Indian coal seams into pillars and galleries. This results in only 20-30% recovery of coal and rest coal remain ...
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