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A novel approach for the assessment of caving behaviour in a bord …

Generally, In-situ stresses are mostly static, but induced stress developed over pillars and stooks continuously changes at various stages of underground coal mining activities. 1 The bord and pillar mining method is used to operate roughly 70–80% of India's underground coal mines, in which 3000 MT of coal reserves are located in coal ...

Design of Bord and Pillar method in coal mines

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 …

Bord and Pillar Method of Working | PDF | Mining | Coal Mining

The document discusses the bord and pillar method of underground coal mining. It involves driving parallel roads called bords separated by coal pillars. Development involves driving the bords and pillars, followed by depillaring which extracts the pillars. Factors like seam thickness, depth, and roof/floor strength determine suitability. Support systems like …

Deployment of Continuous Miner in under Ground Coal …

Bord and pillar's mining is one of the widely preferred methods of coal extraction in India. Before developing continuous mining technology, the mining cycle was composed of undercutting/middle cutting/side cutting the coal (required as per gassiness of the seam), drilling, blasting and loading.

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 …

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 ...

(PDF) Room and Pillar Mining with case studies

3) Aashutosh Chhirolya, Design of BORD and PILLAR method in coal seams. 4) J.T. Jordaan, Bord-and-pillar mining in inclined orebodies. 5) Wikipedia: Room and Pillar Method. 6) Minewiki: Bord and pillar mining Method.

A Machine Learning Model for Evaluation of Chain Pillar

The size of chain pillars in the Indian geo-mining conditions is primarily decided in accordance with the regulatory provisions. These provisions are of little help for deep longwall workings, exceeding the cover depth of 360 m. Furthermore, these provisions are primarily meant to support pillars in bord and pillar workings. They may not be …

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

Coal pillar extraction at deep cover: With special reference to …

Indian geo-mining scenario of coal pillar extraction is provided. Status of bord and pillar mining for deep coal seams is reviewed. Inherited instability issues of …

Beginners Guide to Room and Pillar Mining

Once the deposit has been fully mined, perhaps the most common option is "retreat mining." This method has been criticized in recent years because it's extremely risky both to workers and local geology.. This technique involves strategically removing the remaining pillars, causing the roof to collapse and the productive area to be filled in by …

Bord & Pillar Mining Methods

However, in India in some cases the depth of mining by bord and pillar method has been around 600 m, though mining at such depths is beset with the problems of strata control. Sometimes, low strength of coal limits the depth to which bord and …

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 …

Deployment of Continuous Miner in under Ground Coal …

Bord-and-pillar mining in inclined orebodies | Journal of …

Bord-and-pillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions. The success of mechanized 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 …

An approach for support design in depillaring panels of …

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 …

LECTURE NOTES ON UNDERGROUND COAL MINING

Drivage of Roadways, development of mine by the method of working known as bord and pillar consists of driving a series of narrow roads, separated by blocks of solid coal, …

Bord-and-pillar mining in inclined orebodies

proven mining method in these conditions and has a lower risk operational failure. Bord-and-pillar mining has some favourable promises such as improving labour difficulties, lowering operating costs and providing safer working conditions. The success of mechanized bord-and-pillar mining in narrow tabular steep dipping orebodies

Room and Pillar Design and Construction for …

by the highwall mining system (Porathuir et al. 2017). In this manner, the coal is accessed from galleries starting at the base of the highwall and driving their way through the deposit. Nevertheless, in the case examined the exploitation is not being made by auger systems but by using the room and pillar mining scheme without any recovery of ...

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.

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 …

underground mining bord and pillar

This paper reviews underground mining methods for total thickness of a thick coal seam in single lift (TTTCSSL). ... Bord and pillar in India adopted induced caving of roof coal band for single lift depillaring of total thickness (SLDTT) of a competent thick coal seam developed along floor. ... longwall and room and pillar methods of ...

9: Illustration of Bord and Pillar Mining Method (Van der …

The success of a bord and pillar mining method in the exploitation of platinum heavily depends on a comprehensive and competent pillar design method. Pillars need to be large enough to contain ...

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 ...

Exploitation of developed coal mine pillars by shortwall mining—a case

Introduction. 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 …

Applicability of Continuous Miner in Room and Pillar …

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

Exploitation of developed coal mine pillars by shortwall mining—a case

1.. IntroductionIn 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 …

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.

Bord and pillar applications on the platinum mine: T-cut …

The mining layout is exactly the same as that of the normal bord and pillar layout (see Figure 3). The bords are 4 m wide and pillar sizes are 13 m x 13 m, thus creating centres of 17 m. The stopping width in the development phase is 1.8 m (0.2 m hanging wall, 0.8 m UG2 reef and 0.8 m footwall). The pillar that is created is then stoped out ...

A novel approach for the assessment of caving behaviour in a bord …

In India, bord and pillar is one of the popular underground mining methods for coal extraction. Bord and pillar are the two basic structures that need to be appropriately designed for the success of mining operations. The performance of these structures depends on geo-mining conditions, state of stress and geotechnical …