• Bord-and-pillar mining explained Illawarra Mercury

    Jun 01, 2017· Bord-and-pillar extraction is the older of the methods, and  The word “bord” is not a misspelling of “board”, but a mining term for an underground space or

  • Room and pillar mining Wikipedia

    OverviewProcessHistoryModern useSee also

    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 active research. The technique is usually used for relatively flat-lying deposits, such as those that follow a particular stratum.

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  • Bord and pillar mining method || underground mining method

    Dec 17, 2019· Hi everyone, In this video we are discussing about the underground mining method,basically what is bord and pillar mining method,what are the conditions

  • 作者: Mining Studies
  • Room and pillar mines, Mining Techniques, Underground

    Room and pillar. Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving "pillars" of unscathed material to support the overstrain leaving open regions or "rooms" underground.

  • Hard-rock room and pillar QueensMineDesignWiki

    Room and pillar is an underground mining method that has applications to a wide variety of hard-rock deposits worldwide. It is commonly classified as an open-stoping method, meaning that development involves mining out underground cavities while leaving

  • (PDF) Underground Mining Methods: Room and Pillar method

    Feb 01, 2014· Underground mining: room-and-pillar mining of thick seams –“Benching” Different approaches allow either the top or bottom part of the seam to be mined out first.

  • Room-and-pillar mining coal mining Britannica

    Other articles where Room-and-pillar mining is discussed: mining: Room-and-pillar mining: The most common mining system is room-and-pillar. In this system a series of parallel drifts are driven, with connections made between these drifts at regular intervals. When the distance between connecting drifts is the same as that between the parallel drifts, then a

  • Bord-and-pillar mining in inclined orebodies

    Bord-and-pillar mining was then compared to conven-tional mining according to the following: financial analysis, dilution and flexibility. Conclusions could now be drawn to the appropriateness of bord-and-pillar mining in Vlakpoort and Moddergat. Results Geology of Vlakpoort and Moddergat The UG2 Chromitite Layer sub-outcrop strikes approximately

  • Design of Bord and Pillar method in coal mines

    Feb 27, 2016· Bord and Pillar method of mining is one of the oldest methods. 3. 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.

  • EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

    Bord and Pillar method of mining. Bord and Pillar method of mining is one of the oldest methods of mining. The success of Bord and Pillar mining is selecting the optimum pillar size. If the pillars are too large, then the extraction ratio decrease leading to less production and profitability and if

  • Room and pillar mines, Mining Techniques, Underground

    Room and pillar. Room and pillar is also known as bord and pillar is a mining system in which the mined material is taken out across a horizontal plane while leaving "pillars" of unscathed material to support the overstrain leaving open regions or "rooms" underground.

  • Hard-rock room and pillar QueensMineDesignWiki

    Room and pillar is an underground mining method that has applications to a wide variety of hard-rock deposits worldwide. It is commonly classified as an open-stoping method, meaning that development involves mining out underground cavities while leaving

  • Room-and-pillar mining coal mining Britannica

    Other articles where Room-and-pillar mining is discussed: mining: Room-and-pillar mining: The most common mining system is room-and-pillar. In this system a series of parallel drifts are driven, with connections made between these drifts at regular intervals. When the distance between connecting drifts is the same as that between the parallel drifts, then a

  • Design of Bord and Pillar method in coal mines

    Feb 27, 2016· Bord and Pillar method of mining is one of the oldest methods. 3. 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.

  • (PDF) Pillar design in coal mines ResearchGate

    The 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

  • Room and Pillar / Entry Development Underground Mining

    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 seamlessly together as a system, providing the