room and pillar mining pulling pillars

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  • Room and pillar mining

    Jan 16, 2018· The pillar design guidelines have been incorporated into software packages that can be used for the preliminary design of pillars for longwall gateroads and retreat mining in coal and in limestone min The software packages are: ALPS (Analysis of Longwall Pillar Stability) for longwall gateroad pillars in coal...

  • Pillar design incoalmines

    and-pillar mining isthe seam thickness The influence ofthis parameter on the amount ofcoal lost inthe support pillars is shown in Fig 2, which illustrates clearly how in a conventional bord-and-pillar system thecoallossesincrease with seamheight From Figs Iand2itfollowsthat theareaofapplica-tion ofconventional bord-and-pillar mining ....

  • Room and Pillar Mining Method

    Oct 22, 2014· Room and Pillar Mining Method 1 Hassan Z Harraz [email protected] 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...

  • Room and Pillar Mining

    Some underground mining techniques include room and pillar mining, and long wall mining Room and pillar mining is usually completed in flat dipping bedded or Pillars are placed in a particular pattern and the rooms are mined out This method is used in deposits such as oil shale and coal...

  • Rib pillar design in open stope mining

    ROCK MECHANICS Rib pillar design in open stope mining Y Potvin, M Hudyma and HDS Miller The University of British Columbia ABSTRACT This paper introduces a new approach for the design ofrib...

  • Retreat mining

    Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining In the first phase of room and pillar mining, tunnels are advanced into the coal or ore body in a rectangular pattern resembling city streets Pillars are left between tunnels to ,...

  • coal mine roof fall afrter pillaring

    May 03, 2012· this is what happens after the pillars have been removed A normal day at work for a coal miner...

  • Room & Pillar Mining

    This is called "pulling the pillars" While a longwall section would have production rates of 1,000 to 20,000 tons per shift, room and pillar mines have lower production rates of 600 to 1,000 tons per shift per miner unit Photo is a Continuous Miner machine, commonly used in coal room and pillar mining...

  • Pillar design

    Post Pillars Room and pillar variation where ore is mined out in a series of horizontal slic , General Aspects of Pillars Pillar design considerations , The following pictures show an experiment that was carried out on a large pillar in which mining was carried out around it so the load is increased In the center-height of the pillar ....

  • Post pillar case study

    Mining and Development The Agnew Mine combined the beneficial supportive properties of cut and fill with room and pillar to create a highly productive and safe mining method for poor ground conditions The pillars provide support for the hanging wall for the entire extraction period...

  • Freehand Sketching

    To demonstrate the freehand sketching technique, let's start by building a simple room and pillar coal mining geometry The roadways measure 2m wide by 2m high, and the coal pillars measure 6m towards the East and 4m towards the West We want to start with a ,...

  • What is room and pillar mining

    Room and pillar mining is when pillars of rock are left standing to support the roof Between the pillars, coal or ore is cut out and removed leaving spaces known as rooms...

  • Toward Pillar Design to Prevent Collapse of Room

    TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOM-AND-PILLAR MINES R Karl Zipf, Jr , Room-and-pillar mining accounts for a significant portion of the total mineral production in the United States , 11 to 13 are typical for panel pillars after retreat mining...

  • Room and pillar

    Room and pillar This method consists in a variety of empty stopes where only part of the ore is extracted, the rest being left in the form of pillars to support the back These pillars may be abandoned definitely or be recuperated later...

  • Talk:Retreat mining

    I think that "retreat mining" is made up by the AP, since almost all mining methods retreat back towards good ground and pulling pillars is common to all mining methodsDjoeyd114 20:44, 16 August 2007 (UTC) Merger proposal I propose that Retreat mining be merged into Room and pillar...

  • Underground Mafia

    Room & Pillar and longwall mining method explained Room and pillar and long Wall mining Ruben Pillar is a mining method involving the extraction of coal that forms a series of rooms while leaving pillars or columns of coal to help support the mind roof The rooms are generally 20 to 30 feet wide and the remaining pillars are 20 to 90 feet wide as production advances A grid-like pattern ....

  • The strength of hard

    developed for room and pillar mining of horizontal coal seams and that the value of K is only typical for South African coal One of the earliest investigations into the design of hard-rock pillars was carried out by Hedley and Grant [3] They analyzed 28 rib-pillars (3 crushed, 2 partially failed, and 23 stable) in massive quartzites and...

  • West ia coal mininglittle pillar action

    Jul 17, 2013· This video was uploaded from an Android phone...

  • (PDF) Room

    Room-and-pillar panel design method to avoid surface subsidence Article (PDF Available) in Mining Engineering Vol 67(No 7):105-110 July 2015 with 2,802 Reads How we measure 'reads'...

  • MINING BLOCK STABILITY ANALYSIS FOR ROOM

    consideration at designing pillars and room Mining Block Stability Analysis for Room-And-Pillar Mining with Continuous Miner in Estonian Oil Shale Mines 519 Room Sizes and Technological Requirements The influence of random deviations of the actual room sizes (Table 1) on the...

  • Room and Pillar / Entry Development

    The Joy room and pillar/entry development product suite is extremely robust, including continuous miners, entry development equipment, haulage systems, feeder breakers, bolters, and loaders All our equipment is designed to work seamlessly together as a system, providing the ,...