Definition of bord-and-pillar method A system of mining in which the distinguishing feature is the winning of less than 50 coal on the first working It is more an extension of the development work than mining The second working is similar in principle to top slicing The remainder of the coal is won by a retreating system, the cover being ....
Pillar Strength and Design Methodology for Stone Mines
Pillar Strength and Design Methodology for Stone Mines Gabriel S Esterhuizen, Sr Research Engineer Dennis R Dolinar, Lead Research Engineer John L Ellenberger, Lead Research Scientist NIOSH-Pittsburgh Research Laboratory Pittsburgh, PA ABSTRACT Underground stone mines in the United States make use of the room-and-pillar method of mining...
Basic parameters of bord and pillar mining system 1 Gallery bord 2 Pillar 3 Junction Calculation of percentage of extraction during development If coal from the full seam thickness is extracted, the percentage of extraction during development is nearly 20 in deep mines and 35 in shallow min...
This diagram shows the traditional method of bord and pillar mining Miners first extracted coal along roadways or bords, while the coal in between the bords acted as pillars holding up the roof Then the outer pillars were mined, leaving the roof to ....
v117n3a2 Factors and challenges affecting coal recovery by ,
pillar coal remaining from a previous bord-and-pillar operation that reached its end of life in the 1980s The underground mine was operated using the conventional drill-and-blast, bord-and-pillar mining method The pillars were left intact when the underground operation was shut down In 1995, a project to extract the remaining pillars was ....
Jan 22, 2014 0183 32 Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation Development by CCM The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted...
Matla Mine 2 utilises both bord and pillar an total extraction coal mining methods to mine the 2 seam and proposes to mine the 4 seam in future Total extraction of a wall in the northeast area is currently underway, but bord and pillar mining may also be utilised in that area if required...
PDF 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 ....
At present, production by longwall mining accounts for a minor amount of total underground mining production with the majority coming from bord-and-pillar methods Since it is envisaged that longwall mining will require time to become established in India, bord-and-pillar methods will continue to be dominant in the foreseeable future Thus, it ....
Increasing Production Time in Continuous Mining Methods
Increasing Production Time in Continuous Mining Methods EE Dorey D McGinness SYNOPSIS The use of continuous miners in a conventional bord and pillar section results in a considerable amount of unproductive time This is due to the roof support requirements, continuous miner configurations, and shuttle car change-outs These factors have...
TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOM-AND-PILLAR MINES R Karl Zipf, Jr Chief, Catastrophic Failure Detection and Prevention Branch , Traditional strength-based pillar design methods applicable to coal or hard-rock mines use a , Room-and-pillar mining ,...
Evaluation of Current Pillar Design Practice in Ramagundam ,
Bord and Pillar mining is the oldest and most popular mining method to extract coal from underground It is simple, easy to operate and reasonably safe The pillars form the natural support to the overburden roof and transfer the load to floor In the process a large portion of the coal remain blocked for long period till depillaring is carried out...
Research Report on the Coal Pillar Recovery under Deep ,
RESEARCH REPORT ON THE COAL PILLAR RECOVERY UNDER DEEP COVER Office of Mine Safety and Health Research National Institute for Occupational Safety and Health Centers for Disease Control and Prevention Department of Health and Human Services February 2010 EXECUTIVE SUMMARY Background...
Bord and Pillar method of mining is one of the oldest methods 3 INTRODUCTION In India, about 98 of underground output of coal is, Get Price A Guide to Surface Features Related to Underground Coal Mining...
Mar 24, 2013 0183 32 Bord and pillar, same as board I guess , Post and Stall, Stall Worked, and here is one up for grabs, for some reason I cannot shake off the thought that I recall this method being referred to as Pillar and Post locally at least, I know that it seems to be nonsensical by virtue of both terms being support methods, but we are a queer lot in this corner anyway tail-gate corner that is, probably ....
Bord and pillar applications on the platinum mine T cut The T cut mining method is basically a partial pillar extraction method The pillar 13 m x 13 m created by the bord and pillar development is being stoped only the UG2 reef out for 2 m from the roadways on all sides, to leave an effective pillar of 9 ,...
power point presentation on board and pillar mining
bord and pillar mining method crusherasia bord and pillar coal mining ppt , , power point presentation on board and pillar mining Get More power point presentation on board and pillar mining evaluation of bord and pillar mining system in mcl coal mines ethesis The most pleasant point of presenting a thesis is the opportunity to thank...
Productivity Improvement in Underground Coal Mines
The only way to achieve this is to reduce production costs by improving productivity, efficiency and the effectiveness of the equipment This paper aims to identify the various factors and problems affecting the productivity of underground coal mines adopting the bord and pillar method of mining and to propose suitable measures for improving them...
Pillar Extraction using Continuous Miners Introduction ,
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 eg...
Bord and Pillar Methods Coal, Colliery and Mining Forum
Mining Methods and Geology Bord and Pillar Methods Mining Methods and Geology , Bord and Pillar Methods General chat about bord and pillar Threads and Posts Total Threads 5 Total Posts 77 This board has 1 moderator On This Board You cannot create threads...
Pillar Extraction using Continuous Miners Introduction ,
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...
Coal Mining Methods Underground Mining Longwall Room and Pillar Mining Longwall mining and room-and-pillar mining are the two basic methods of mining coal underground, with room-and-pillar being the traditional method in the United Stat Both methods are well suited to extracting the relatively flat coalbeds or coal seams typical of...
Feb 27, 2016 0183 32 This method is sometimes called room-and-pillar mining This can be better understand with the help of follwing fig 6 APPLICABILITY OF BORD AND PILLAR METHOD The Bord and Pillar method is adopted for working 1 A seam thicker than 15 m, 2 A seam free from stone or dirt bands...
EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES , 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 collapse If the pillars are too large then significant...
Indian miners moves to get longwall mining back on the rails were , by the bord-and-pillar mining method, and the longwall mining process, Get Price Coal India may invite global firms to extract coal bed methane - The , Aug 1, 2018 , We plan to appoint global mining development operators MDO for outsourcing methane production ....
Mining method and equipment 421 General The bord and pillar mining layout will be maintained because of its reliability, flexibility, low capital cost, low working costs and large skills source availability Woodruff, 1966 Increasing mechanization has resulted in ,...
Oct 22, 2014 0183 32 Room and Pillar Mining Method 1 Hassan Z Harraz hharraz2006 yahoo 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors...
PDF Underground Mining Methods Room and Pillar method
Underground Mining Methods Room and Pillar method , Characteristics of R P method in non-coal applications R P classic Step mining Post-pillar mining Configuring the R P method in coal ....
