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 ...
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 ...
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
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 …
MINING ENGINEERING BY MANOJ KUMAR BISWAL ... 1.1 Accident statistics of Indian underground coal mines 8 ... 2.3.2 Guidelines for drawing of support plans in bord & pillar Barton's Q-system Bieniawski's RMR system 11 12 13 2.4 CMRI-ISM Rock Mass Classification 13 2.5 Design of support for development & depillaring working 17 2.6 Monitoring ...
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 …
As bord and pillar workings are developed roof support becomes a major consideration and operating cost item. Support requirements vary considerably and are dependent on the physical conditions in the seam, which are often depth dependent, and the length of time that the workings are required to be serviceable. ... In underground mining, first ...
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 ...
In India, underground coal production is mostly dependent upon the conventional bord and pillar (room and pillar) method of mining, although the overall output per man shift (OMS) through this method is generally not more than 1 ton in any of the mines [1].Large areas in all the subsidiaries of Coal India Limited and even in Singarani Coal Companies Limited (India) …
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 ...
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 …
Bord and Pillar method of mining is one of the oldest methods. The key to the successful Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too small the mine will ...
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.
Coal in India is extracted generally by semi-mechanized and mechanized underground mining methods. The Bord and Pillar (B & P) mining method still continues to be popular where deployment of ...
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.
@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 …
Among different methods of underground mining technology adopted for coal extraction, bord and pillar mining is the most popular and predominant method of underground mining in India. This method is characterised with small capital investment and faster rate of return on capital. Varying geomining conditions demand scientific approach for design of …
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 …
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.
pillar mining system in India. The growing coal demand requires the mechanized depillaring to extract the coal from underground at a faster rate. A continuous miner (CM) is a suitable machine for mechanized depillaring operations in bord and pillar workings. In India, the bord and pillar panel developed by conventional mining methods (drill 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 …
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 …
are about 95, 33 and 20% respectively, India produces only about 15% of coal from underground mines (Prasad 2009). 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 India, and the rest is mined by the longwall mining method.
underground mine with a method of mining/technology (i.e. Bord and Pillar mining method). In which we have analyzed from the below-mentioned seams in mine they are, 1 seam average thickness of 2.5 mts to 3.30 mts. 2 seam average thickness of 2.5 mts to 3.30 mts. 3 seam average thickness of 3 mts to 3.60mts. 2.
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 …
MINING METHODS (UNDERGROUND COAL) 1.0 INTRODUTION TO UNDERGROUND COAL MINING : 1.1 Classify Underground Coal Mining Methods. Method of winning coal in underground mines are classified into two main categories : 1. Bord and pillar (also known as pillar and stall) and its modification. 2. Longwall (i) Advancing, (ii) Retreating.
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 …
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 …
Ensuring rib stability during pillar extraction is of prime importance in bord and pillar (B&P) method of underground coal mining with caving.
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 …
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 ...
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
using Bord and Pillar mining methods- a variation of sorts of Room and Pillar mining, and little by longwall mining. More than 90% of Indian underground coal production is generated from bord and