full pillar extraction coal mining in south africa

SOUTH AFRICAN COAL SECTOR REPORT - Energy

systems employed in South Africa in such a case. In rib-pillar extraction, a continuous miner machine cuts a roadway up to 1.5 kilometres in length through the coal and 5 metres in from the edge of the area to be mined. This leaves a 5 meter-wide band of coal in the form of a long, isolated rib pillar along one side of the tunnel.

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Coal pillar extraction experiences in New South Wales

coal production. Pillar extraction, as an alternative high extraction system to longwalling, is practiced successfully in Australia (New South Wales) and the USA, but only to a limited extent in South Africa. The resultant pillar creation in South Africa and their subsequent extraction is the focus of

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Risk management of underground coal pillar extraction in ...

Pillar extraction practices in South Africa have consumed a significant proportion of safety and fatality statistics in relation to its relative output (less than 5% of total South African coal ...

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Risk management of underground coal pillar extraction in ...

Analysis of Pillar Extraction Potential (A-PEP) is an intelligent tool that could be used as a preliminary output indicator when considering the secondary extraction of regional support pillars in the Witbank and Highveld coalfields of South Africa. Pillar extraction practices in South Africa have consumed a significant proportion of safety and fatality statistics in relation to its relative ...

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Probability of failure of South African coal pillars

by bord and pillar mining and it was therefore assumed that this technique accounted for 100% of the total registered coal output. For the time between 1970 and 1994, when other mining methods such as opencast mining, longwall mining, and total pillar extraction increased their influence, no accurate production data could be found. However, charac-

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Key success elements of coal pillar extraction in New ...

the four full pillar extraction and three partial pillar extraction sites visited in New South Wales. These will be discussed under the broad headings of Section 138, geotechnical mapping, caving of the immediate roof, mining method, temporary support, mining equipment and training. Section 138 of the New South Wales Coal Mines Regulations Act ...

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TECHNOLOGY OF EXTENDED PILLAR RECOVERY IN ROOM

coal mining technologies. This article reviews process flow charts of coal extraction from pillars in the room and pillar minin g technolo y in the USA, Australia, South Africa, etc. The technolo - ical advance is based mobile roof support applied since 1970 for ground control and to

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SOUTH AFRICAN COAL SECTOR REPORT - Energy

systems employed in South Africa in such a case. In rib-pillar extraction, a continuous miner machine cuts a roadway up to 1.5 kilometres in length through the coal and 5 metres in from the edge of the area to be mined. This leaves a 5 meter-wide band of coal in the form of a long, isolated rib pillar along one side of the tunnel.

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Risk management of underground coal pillar extraction in ...

Analysis of Pillar Extraction Potential (A-PEP) is an intelligent tool that could be used as a preliminary output indicator when considering the secondary extraction of regional support pillars in the Witbank and Highveld coalfields of South Africa. Pillar extraction practices in South Africa have consumed a significant proportion of safety and fatality statistics in relation to its relative ...

Read More
Probability of failure of South African coal pillars

by bord and pillar mining and it was therefore assumed that this technique accounted for 100% of the total registered coal output. For the time between 1970 and 1994, when other mining methods such as opencast mining, longwall mining, and total pillar extraction increased their influence, no accurate production data could be found. However, charac-

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Increased underground extraction of coal. [South Africa ...

@misc{etde_6030788, title = {Increased underground extraction of coal. [South Africa]} author = {Fauconnier, C J, and Kersten, R W.D.} abstractNote = {This book was compiled from the lecture notes of contributors to the Vacation Schools organized by the South African Institute of Mining and Metallurgy held at the University of Witwatersrand during January and February 1981.

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(PDF) Pillar design in coal mines - ResearchGate

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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Analysis for pillar extraction potential (A-PEP)-a risk ...

UND, G,H. Analysis for pillar extraction potential (A-PEP)-a risk-based program for underground coal mining.Application of Computers and Operations Research in the Minerals Industries, South African Institute of Mining and Metallurgy, 2003. Analysis for pillar extraction potential (A-PEP)-a risk-based

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Pillar Extraction using Continuous Miners - underground COAL

PILLAR EXTRACTION USING CONTINUOUS MINERS. Overview. Now that longwall equipment has been developed to a stage where it is able to cope with most conditions satisfactorily, longwall mining is the most widely used method of secondary extraction. However, there are still mines and occasions where longwall mining is not suitable e.g.

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Pillar Extraction - an overview ScienceDirect Topics

Pramod Thakur Ph.D., in Advanced Mine Ventilation, 2019. Abstract. Longwall mining or coal pillar extraction by any other method causes the roof to subside and the floor to heave. The “gas emission space” created by such coal extraction can extend 1000 ft above and 250 ft below the working seam depending on the width of the panel. Any coal seam contained in the gas emission space will ...

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EVALUATION OF BORD AND PILLAR MINING SYSTEM IN

mining and its development correlate closely with cultural progress. Mining processes involve prospecting for ore bodies, analysis of the profit potential of a 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.

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Kobus Gerber - Contract Manager - STA Coal mining LinkedIn

Kobus Gerber Newcastle, KwaZulu-Natal, South Africa Contract Manager at STA Coal mining Experience in: Mechanical mining development Mechanical pillar extraction Drill and blasting Shafts Cm development Cm pillar extraction Special support Long wall development Long wall mining Safety 40 connections View Kobus's homepage, profile, activity, articles

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Factors and challenges affecting coal recovery by opencast ...

Opencast pillar mining requires maximizing coal recovery in order to be competitive in the market, since a portion of the resource has already been extracted. Exposure and recovery of the coal are crucial in reducing coal losses and dilution due to the coal pillars and voids, and challenges experienced during the mining of pillars from surface.

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4 Coal Mining and Processing Coal: Research and ...

The U.S. coal industry serves a vital role in the nation’s economy by producing fuel for more than half of its electricity. Despite the industry’s importance, industry financial data for 2005—the strongest year for the coal industry in recent years—shows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between $1 billion and $2 ...

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and pillar mining equipment

Room-and-pillar coal mining equipment Engineer Live. 2013-2-21 21st February 2013 Paul Boughton. The first full fleet of Cat branded room-and-pillar coal mining equipment is being installed by Armstrong Coal in conjunction with the opening of its new underground mine at Lewis Creek in Kentucky.

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Risk management of underground coal pillar extraction in ...

Analysis of Pillar Extraction Potential (A-PEP) is an intelligent tool that could be used as a preliminary output indicator when considering the secondary extraction of regional support pillars in the Witbank and Highveld coalfields of South Africa. Pillar extraction practices in South Africa have consumed a significant proportion of safety and fatality statistics in relation to its relative ...

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Pillar design in coal mines - Journals

mission, about 33 per cent of South Africa's coal reserves fall within this range. If the limits for the application of bOld-and-pillar mining methods are widened to a coal-to-waste ratio of 1:5 and 40 per cent lost coal, then almost 63 per cent of the country's coal reserves fall within the scope of bord-and-pillar mining.

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SOUTH AFRICAN COAL SECTOR REPORT - Energy

systems employed in South Africa in such a case. In rib-pillar extraction, a continuous miner machine cuts a roadway up to 1.5 kilometres in length through the coal and 5 metres in from the edge of the area to be mined. This leaves a 5 meter-wide band of coal in the form of a long, isolated rib pillar along one side of the tunnel.

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Operations - Seriti

Commissioned in 1982, the New Denmark Colliery is situated in the Highveld coalfields, about 30km north of Standerton, Mpumalanga. One of the deepest coal mining operations in South Africa, New Denmark is a mechanised mine, with the bulk of production being sourced from one extraction unit using longwall mining methods.

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Extraction Technology and Pillar Design Analysis of End ...

pillar design in end-wall mining system According to the theoretical and numerical simulation results, end-wall mining system can increase the coal recovery from residual coal resources around end-wall and reduce the effect of underground mining operation on slope stability. Keywords: end-wall mining, pillar design, extraction, recovery ratio.

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SOUTH AFRICA’S COAL INDUSTRY OVERVIEW, 2014

Both opencast and underground mining methods are employed in South Africa for extraction of coal reserves. There are three different mining methods that are commonly used in underground mines in South Africa. The most common technique is the ’bord and pillar’ method. This method is ideal for relatively shallow deposits

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A limit equilibrium fracture zone model to investigate ...

Sep 01, 2018  This may nevertheless be a good approximation of coal mine problems where pillar scaling occurs while the roof and floor remains intact . Download : Download high-res image (183KB) Download : Download full-size image; Fig. 9. Scaling of a coal pillar in the Vaal Basin in South Africa .

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Deformation Mining - Council for Geoscience

Province of South Africa, coal mining commenced at the turn of the 20th century. The room and pillar (also called bord and pillar) was the extraction technique of choice in the early days. The room and pillar technique is a system in which mined material is extracted across a

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25.6 Mining in South Africa Mining of mineral resources ...

Surface mining. Surface mining is exactly what the word says - digging rocks out from the surface, forming a hole or pit. In South Africa, this method is used to mine for iron, copper, chromium, manganese, phosphate and coal. Surface mining is also known as open pit or open cast mining. An open pit coal mine.

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Subsidence from Underground Mining: Environmental

on longwall and room-and-pillar mining of coal. It has been estimated that coal extraction is respon­ sible for over 90 percent of worldwide mining-in­ duced subsidence (Alien, 1978), Longwall mining currently accounts for less than 10 percent of the coal mined in the United States, although it has

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Design Criteria for Mechanised Drilling Coal Mines

strip mining depths less than 60 m (li) continuous miners - bord-and-pillar down to . 150 m (iii) mechanised longwalls - depths greater than 150 m . However, despite these trends, some 60 per cent of South Africa's an­ nual coal production of 70 Mt is extracted by mechanised bord-and-pillar mining, that coal

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Factors and challenges affecting coal recovery by opencast ...

Opencast pillar mining requires maximizing coal recovery in order to be competitive in the market, since a portion of the resource has already been extracted. Exposure and recovery of the coal are crucial in reducing coal losses and dilution due to the coal pillars and voids, and challenges experienced during the mining of pillars from surface.

Read More
Board Pillar? Coal, Colliery and Mining Forum.

Dec 07, 2015  Nov 25, 2013 at 6:01am tygwyn said: You should have joined in on the debate,as it was not mentioned about a certain depth for Bord and Pillar,but a mention by a Mining Engineer that at greater depth there was need for larger pillars with his link to the Coalbrook disaster in South Africa in

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