typical oreflow system in a bord and pillar coal mine 2

  • Room and pillar mining Wikipedia

    Room and pillar (variant of breast stoping), is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. To do this, "rooms" of ore are dug out while "pillars" of untouched material are left to support the roof overburden.Calculating the size, shape, and position of pillars is a complicated procedure, and is an area of

  • Room and pillar mines, Mining Techniques, Underground

    The room and pillar system is used in mining coal, iron and copper ores mainly when found as manto or blanket sediments, stone and aggregates, talc, soda ash and potash. The key to the winning room and pillar mining is opting the optimum pillar size. If the pillars are so small the mine will fall down.

  • EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

    This is to certify that the thesis entitled “EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES” submitted by Sri Ram chandra Nayak, Roll No. 10605015 & 1 Cross section of typical Bord and pillar layout 11 2 Type of machineries in pillar mining 12 3 The tributary area pillar loading concept 19

  • Bord and pillar mining Coal and coal mining Te Ara

    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 collapse in a controlled way as miners retreated to the exit.

  • typical oreflow system in a bord and pillar coal mine 2

    typical oreflow system in a bord and pillar coal mine : 4.8/5 · 2,775 ; posts related to typical oreflow system in a bord and pillar coal mine. room and pillar mining animation. animation video example of mechanized room and pillar mining . Get Price

  • typical oreflow system in a bord and pillar coal mine 2

    bord and pillar mining method. coal mining ore crusher price. in deep mining the room and pillar or bord and coal mining in india has a long history methods of mining overview and graphic of coal mining methods get price typical oreflow system in a bord and pillar coal mine 2get price

  • Room and Pillar Mining an overview ScienceDirect Topics

    The major partial mining method are strip pillar mining, Wongawilli strip pillar mining, room and pillar mining, and thickness-limited extraction. 1. Strip pillar mining. Strip mining technology is an effective measure to reduce the overburden strata and surface movement and deformation, and it is also one of the important measures in the system of “Green Mining.”

  • typical bord and pillar mine plan ppt BINQ Mining

    ROOM AND PILLAR PPT in Yemen Crusher South Africa. typical oreflow system in a bord and pillar coal mine. Room & Pillar Mine The PowerPoint PPT presentation: "2nd Pillar

  • Design of Bord and Pillar method in coal mines

    Feb 27, 2016· INTRODUCTION In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods. The other countries where Bord and Pillar method predominates are Australia, The USA and South Africa. The key to the successful Bord and Pillar mining is selecting the optimum pillar size.

  • VENTILATION PLANNING LAYOUTS FOR LARGE OPENING

    Large room-and-pillar stone mining fundamentals The value per ton of ore for large room-and-pillar stone mines is typically low, therefore productivity must be high. Typical face areas are 12.2 m wide x 7.6 m high (40 ft wide by 25 ft high) with 4.3 m (14 ft) pulled with each blast (Figure 1). This equates to over 1,000 tons of stone per

  • VENTILATION PLANNING LAYOUTS FOR LARGE OPENING

    Large room-and-pillar stone mining fundamentals The value per ton of ore for large room-and-pillar stone mines is typically low, therefore productivity must be high. Typical face areas are 12.2 m wide x 7.6 m high (40 ft wide by 25 ft high) with 4.3 m (14 ft) pulled with each blast (Figure 1). This equates to over 1,000 tons of stone per

  • EVALUATION OF BORD AND PILLAR MINING SYSTEM IN

    This is to certify that the thesis entitled “EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL COAL MINES” submitted by Sri Ram chandra Nayak, Roll No. 10605015 & 1 Cross section of typical Bord and pillar layout 11 2 Type of machineries in pillar mining 12 3 The tributary area pillar loading concept 19

  • Evaluation of Bord and Pillar Mining System in MCL Coal Mines

    Varying geo-mining conditions make it extremely difficult to extract more than 30% of the total coal reserve by room-and-pillar (also known as bord-and-pillar) method, which is again the most

  • coal production by bord and pillar india

    Here we will discuss about Evaluation of bord and pillar mining system in mcl coal bord and pillar mining india production is achieved by conventional BordGet Price Pillar design incoalminesSAIMM the percentage production efficiency of bOld-and-pillar mining methods are widened to a coal-to-waste ratio of1 conventional bord-and-pillar mining

  • CHAPTER 11 Mining Technology

    over the life of the system for the typical room-and-pillar operation in the West, using continuous miners. In many cases, the sav-ings in labor and the other advantages of using longwall mining may not be sufficient to offset this cost differential. Nevertheless, longwall systems are likely to figure prom-inently in mining underground Federal coal

  • (PDF) CFD Modeling of Ventilation System of Bord & Pillar

    Indian coal mining industry is now adopting bulk production technology, viz. Longwall technology and continuous miner (CM) in Bord & Pillar development along with mechanized transportation

  • bord and pillar mine Traiteur Deli Dish

    Description of developed Bord-and-Pillar panel of a coal mine. Bord-and-Pillar is a system for underground mining (mainly for coal iron mining) in which a horizontal plane some "pillars" of mined materials are left to support the overburden while mined materials are extracted leaving some open areas around the pillars which are known as . Chat

  • University of Wollongong Research Online

    Room and Pillar mining technique with continuous miners is the pre-dominant technology used in underground coal production. Room and Pillar mining method falls in the category of open stopping method and is often used to excavate horizontal deposits with reasonably competent roof strata. A typical continuous miner is shown in Figure 1.

  • Hard-rock room and pillar QueensMineDesignWiki

    To evaluate the condition of existing pillars, mines often develop a pillar rating system in hard rock mines. As an example, the mines of Vibernum Trend use a rating system from 1 to 6 to monitor pillar condition. A rating of 1, indicates no signs of stress and a rating of 6, indicates complete failure.

  • Monitoring and management of subsidence induced by

    Figure 2.2 An operating longwall coal mine face.. 5 Figure 2.3 Schematic cutaway view of a typical longwall coal mine .. 6 Figure 2.4 Plan layout of a typical longwall mine, also showing some bord and pillar

  • Pillar Strength and Design Methodology for Stone Mines

    mines. This paper presents a pillar strength equation with associated design guidelines that will assist in the design of safe room-and-pillar workings in stone mines. BACKGROUND In a room-and-pillar mine, the pillars are required to provide global stability which can be defined as supporting the overlying strata up to the surface.

  • Mining simulation for room and pillar coal

    Mining simulation for room and pillar coal operation by S.P. Pereira*, J.F.C.L. Costa†, P. Salvadoretti†, and J. Koppe† Synopsis The mechanized mining cycle using loaders and shuttle cars had its peak in terms of usage in the mining industry during 1950 through 1960. In Brazil, this system is still used at underground coal mines

  • Mining Methods Lithgow Environment Group

    The mined panel created is between 2-4m thick and up to 400m in width, and all coal is removed. Longwall panels are located in parallel, separated by coal pillars. Longwall mining increases coal retrieval rates by up to 60% more than bord and pillar methods. The typical longwall panel can take a year to mine.

  • Bord and Pillar Method-Handouts Coal Mining Explosion

    In the present scene of underground mine development by Bord and Pillar system, mostly square pillars are being formed of size dictated only by depth and width of galleries under the Coal Mine Regulations. BORD&PILLARLAYOUT 4/16/2013. DEVELOPMENT A group of such pillars form what is known as a panel and one panel is separated from another panel

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