Guidelines for hard rock pillar design in South African bord-and-pillar operations are presented in this report as well as a proposed multi-year research project to address the unknowns in …
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Paper written on project work carried out in partial fulfilment of Technikon Practical Training Frank shaft is mining both Merensky reef and UG2 reef. The Merensky orebody is almost depleted and this was the reason for starting to mine the UG2 ore reserves. It was decided to mine the UG2 orebody with trackless equipment using a bord and pillar mining method. …
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Research Article Stability Analysis of Pillar System during Room and Pillar Retreat Mining with Three Coal Seams Un Chol Han,1 Kum Il Pak,2 Chung Song Choe,1 Kun Ui Hong,2 and Chung Il Kim 2 1School of Science and Engineering, Kim Chaek University of Technology, Pyongyang 999093, Democratic People's Republic of Korea 2Faculty of Mining Engineering, Kim Chaek …
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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 titled "DESIGN OF SUPPORT SYSTEM IN BORD AND PILLAR MINE" being submitted by Mr. Anurag Kumar Jha (Roll no-511214025) to the …
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bord-and-pillar will remain the dominant mining method for the foreseeable future. It is therefore expected that a substantial part of any such increase will be mined by bord-and-pillar techniques. A variety of equipment is used in South Africa for bord-and-pillar mining in narrow coal seams. This equipment
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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. …
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4. Characteristic of R & P It is the most common supported pillar method, designed and used primarily for mining flat-lying seams, or tabular orebodies, or gently dipping bedded ore deposits of limited thickness (like coal, oil shale, limestone, phosphate, salt, trona, potash, and bedded uranium ores,). Room and pillar methods are well adapted to …
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This research makes a critical review of the current design approach so as to understand the contributors to pillar failure in a section of an underground platinum bord and pillar mine.
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Mine Portal - India's Mining Exams Test Series Provider, Mine Portal is the favorite choice of thousands of mining professional aspirants for online exam preparation. [email protected] +91 8804777500 ... CONTOUR MINING-STRIP MINING-ROOM & PILLAR MINING. THICK SEAM MINING METHODS.
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Most autonomous navigation systems used in underground mining vehicles such as load–haul–dump (LHD) vehicles and trucks use 2D light detection and ranging (LIDAR) sensors and 2D representations/maps of the …
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The significance of mining to human civilization is undeniable. Mining, being one of the earliest human endeavors, and its evolution are inextricably linked to cultural advancement. Mining is the cradle of all other businesses. Different strategies have been approached for mining effectiveness while keeping output and safety in mind. The Bord and Pillar method of mining …
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A statistical model was developed for investigating the influence of gently inclined medium thick orebody, the footwall dip angle, the Footwall surface roughness, draw point interval and production blast ring on the recovery ratio, …
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One among the oldest methods of mining is that the Bord and Pillar. It's a way within which the mined material is extracted across a horizontal plane while leaving "pillars" of untouched …
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Room-and-pillar mining is an open stope mining method that uses surrounding rocks and regular continuous pillars or rib pillars to maintain stope stability in the process of room stoping. The long-axis direction of the stoping room in the mining system can be arranged along the strike or dip, and the rooms and pillars are arranged alternately ...
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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
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South Africa is one of the leading producers and exporters of coal globally. A significant amount of the country's production is obtained from previously mined underground bord and pillar workings. This coal is in the form of pillars and remnants on the roof and floor of the old workings. The good quality coal pillars were left behind as primary support during …
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4. BASIC PRINCIPLE OF BORD AND PILLAR METHOD The 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, …
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In room & pillar mining the tabular or bedded thin to moderately thick ore bodies dipping from flat to incline (up to 40° or so) are mined by driving the rectangular or square shaped openings in the deposit. A pillar that separates two adjacent openings is left in between to provide natural support. If the deposit is continuous and the ...
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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 ...
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The room-and-pillar mining method is commonly employed in the exploitation of gently inclined thin orebodies, in which continuous or isolated natural pillars are always retained to support the stope roof [1, 2].Although the remaining natural pillars can effectively improve the overburden stability, a large number of pillars permanently left in the stope lead to an …
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The pillar's performance as a primary support structure is governed by several factors such as rockmass characteristics, rockmass fabric, pillar geometry, pillar floor and roof interaction, mining ...
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The room-and-pillar technique is a self-supporting mining method in which part of the ore is left unmined as pillars. To increase the mining efficiency, the pillars are later recovered partially or completely. This research aims at evaluating and comparing four methods of pillar recovery, namely, 'pocket and wing', 'open ending', 'split and fender', and 'Christmas tree' …
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CW: The primary benefit of bord and pillar mining is that for an equivalent production the capital cost of a bord and pillar operation would be 45% to 65% of that of a longwall mine. The operating costs may be 30% to 60% more than a longwall, but the risks are significantly less and production variances are very low compared to longwall.
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Mine Health and Safety Council A handbook on practical design methodology for spans (bord widths) in bord and pillar mining on platinum and chrome mines in the Bush Veld Complex. Project leader: S K Murphy Project reviewer: W C Joughin, Pr Eng Project team: E J Walls, Pr Sci Nat Research agency: SRK Consulting (Pty) Ltd (South Africa)
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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 ...
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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 ...
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Bord-and-pillar mining explained. By Ben Langford. Updated June 2 2017 - 2:14pm, first published May 31 2017 - 12:47pm. By Ben Langford. Updated June 2 2017 - 2:14pm, first published May 31 2017 ...
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Underground coal mining is characterised by the formation of extensive areas of pillars. The history of mining continues to be blemished by the failure of pillar systems, often …
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Bord and pillar mining method comprises two phases, i.e., development or 'whole working' and depillaring or 'broken working'. Sometimes both these phases proceed simultaneously. In development, pillars are formed by driving a network of galleries, of which one set is
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