The design of pillar systems as practised in shallow hard …

The compelling need for using pillars is dictated by the prevailing consider-ations of rock mechanics at shallow depths, namely the large tensile stresses in the hanging-wall, and …

Room-and-pillar mining | coal mining | Britannica

In coal mining: Mining methods …classified into four distinct categories: room-and-pillar, longwall, shortwall, and thick-seam. Read More; open-stoping methods. In stoping. A common open-stoping method is room-and-pillar mining, in which pillars of ore are left standing to support the rock over a flat-lying ore body.

Coal Mining Methods

strongly favor longwall mining over room-and-pillar mining. In particular, coalbeds deeper than 1000 feet typically must be extracted using longwall mining. Room-and-pillar mining generally is not economical at such depths because the very large pillars are required to support the roof, which significantly reduces the

(PDF) Pillar design in coal mines

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...

Mine Health and Safety Council

from bord and pillar practices in the coal mining industry where the anchor support pattern, spacing layout, as well as the minimum drilling depth into the roof / hanging- ... bord and pillar mining areas of platinum / chrome sector of South Africa's mining industry has occurred (Singh et al., 2010). The accidents prompted the MHSC to

Bord and Pillar Method of Working | PDF | Coal …

The document discusses the bord and pillar method of underground coal mining. It describes how the method involves driving a series of parallel roads separated by blocks of coal (pillars) to develop the mine. After …

Risks and challenges affecting opencast pillar mining in …

During the early years of coal mining, over 90% of South Africa's coal was produced by underground bord and pillar mining (Mohutsiwa and Musingwini, 2015). However, one of the biggest disadvantages of this method is its relatively low extraction ratio - an average of just less than 50% across all collieries in South Africa (Madden et al., 1995).

Toward Pillar Design to Prevent Collapse of Room …

comes from room-and-pillar mining. Metallic minerals valued at about $1 billion, plus nonmetallic minerals valued well in excess of $1 billion, are also produced via room-and-pillar mining. A significant ($600 million) and growing portion of stone and aggregate production uses room-and-pillar mining. In addition, many other mineral commodities

FIRST WORKINGS – Mining Science and Technology

In NSW the size of the pillar is restricted to a minimum of 1/10 of the depth, and the width of the bord to 5.5 m. Special exemptions are required for driving bords (roadways) wider than 5.5 m. The roadways are normally driven in rectangular shape.

Greenside Coal Mine

Coal type: Bituminous (Thermal) Mine Type: Underground, bord and pillar; Start Year: Source of Financing: Articles and Resources Additional data. To access additional data, including an interactive map of world coal mines, a downloadable dataset, and summary data, please visit the Global Coal Mine Tracker on the Global Energy …

Developments Made for Mechanised Extraction of Locked-Up Coal …

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 …

Bord and pillar mining – Coal and coal mining

This diagram shows the traditional method of bord and pillar mining. Miners extracted coal along roadways or bords, with the coal between the bords acting as pillars holding up the roof. The outer pillars were then mined, leaving the roof to collapse in a controlled way as the miners retreated towards the exit.

Bord-and-pillar Definition & Meaning

The meaning of BORD-AND-PILLAR is of or relating to a system of coal mining in which tunnels are driven in a checkerboard pattern having massive square pillars between them which are gradually cut away as the work proceeds.

Chronological development in coal pillar design for …

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 pillars are subsequently extracted allowing the overlying strata to cave in the decoaled area. In some cases where circumstances so ...

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 ...

Research on overburden structural characteristics and …

The section coal pillar is the protective coal pillar of the mining roadway when mining the upper stratified working face. The dip length of the 14,022 working face is 176 m (35 m in the fully ...

Multi-seam coal mining

headed by BHP Billiton Energy Coal South Africa (BECSA). The colliery is located in the Mpumalanga province within the Kendal district. It has the sole purpose of supplying Eskom's Kendal power station with run of mine coal (ROM). The mining methods used are a mechanized bord and pillar method that utilizes continuous miners (CM) and a small-

AN OVERVIEW OF BORD AND PILLAR MINING METHOD

One of the earliest methods of mining is the Bord and Pillar method. The most important aspect of successful Bord and Pillar mining is choosing the right pillar size. The mine …

Guidelines for Pillar design in Bord-and-Pillar operations

Surface Coal Mining Methods in Australia

In Australia, the major coal mi ning methods are as follows: x Underground mining operations: x Longwall mining, and x Bord and pillar mining (also known as room and pillar mining). x Surface mining operations x Open cut mining (strip mining) o Using draglines, o Using truck and shovels, and

[PDF] Pillar design in coal mines

The paper points out that bord-and-pillar mining is the most important method of coal extraction in South Af~ican underground coal mines, and advocates that pillar design procedures should be refined to make more rational allowance for the differences in strength properties between various coal seams and roof and floor strata. However, any …

Can bord and pillar fly in Australia?

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.

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 …

Bord & Pillar Mining Methods

Bord and pillar method of coal mining offers many advantages. The major advantages are: The area to be immediately worked is proved, and so initial planning may be modified to deal with faults and intrusions without serious loss of output.

(PDF) Pillar design in coal mines

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 ...

Pillar design in coal mines

Role of Bord-and-pillar Mining A recent study by King1 has shown that, despite the increase in relative importance of open-cast and long-wall mining methods, bord-and-pillar mining is likely to remain the most important method of coal extraction for many years to come. Compared with the other methods of coal extraction,

A method of designing bord and pillar workings

Journal of the South African Institute of Mining and Metallurgy September, 1967. A METHOD OF DESIGNING BORD AND PILLAR WORKINGS. By M. D. G. Salamon*, Dipl. Eng. (Min) (Hungary), Ph.D. (Durham) (Member) SYNOPSIS. The object of this study is to formulate a procedure for the determination of mining dimensions in bord and pillar …

Coal mining

Coal mining - Underground mining: In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata. …

Room and Pillar Mining

Two dominant methods together account for the vast majority of underground coal mining: "room and pillar" and "longwall" mining. In room and pillar mining, seams of coal are mined partially, leaving large pillars of coal intact to support the overlying layers of rock.Mining by this method creates a network of alternating open spaces and large …

Maxwell Underground Coal Mine, New South Wales, …

The run-of-the-mine (ROM) coal production capacity of the mine is expected to be 5.7 million tonnes per annum (Mtpa). The Whynot coal seam will be mined using the underground bord and pillar technique, while the longwall extraction method will be used for the Woodlands Hill, Arrowfield and Bowfield coal seams. The mine entry area (MEA) …