bord and pillar mining method

  • Bord-and-pillar mining in inclined orebodies

    proven mining method in these conditions and has a lower risk operational failure. 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-pillar mining in narrow tabular steep dipping orebodies

  • 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 explained Illawarra Mercury

    May 31, 2017· What is bord-and-pillar mining? Two main methods of extraction are used for underground coal mines in New South Wales: longwall and bord-and-pillar extraction.

  • Design of Bord and Pillar method in coal mines

    Feb 27, 2016· One of such methods is the Bord and Pillar method of mining. 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.

  • 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

  • Room-and-pillar mining coal mining Britannica

    In 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

  • VENTILATION PLANNING LAYOUTS FOR LARGE OPENING

    workers. Large room-and-pillar stone mines in the United States represent a major sector of mines in the noncoal mining industry. Numerous large room-and-pillar mines began as surface quarries, that due to increased stripping ratios or environmental considerations, have become underground mining operations. These stone mines are characterized by

  • Definition of bord-and-pillar method Mindat

    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

  • EVALUATION OF BORD AND PILLAR MINING SYSTEM IN MCL

    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

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  • Bord and Pillar Method of Working Coal Mining Coal

    Combining the features of both Bord and Pillar methods and Longwall methods, there is another method of mining coal seams which is known as the Shortwall Method of mining. It incorporates the advantages and disadvantages of both Bord and Pillar methods and Longwall methods.

  • 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 m x 9 m. This method creates the required, higher extraction percentage and higher Run of

  • (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

  • Coal Mining Methods Colorado School of Mines

    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 States. Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of

  • Mining Funda: Bord and Pillar method of Mining

    Nov 21, 2019· Bord and pillar mining method comprises two phases i.e DEVELOPMENT and DEPILLARING. Sometimes both these phases proceeds simultaneously. In development, pillars are formed by driving a network of galleries, of which one set is generally parallel to the dip and the other set is parallel to the strike cutting the former at right angles.

  • (PDF) Success of Continuous Miner in Bord and Pillar Method

    Success of Continuous Miner in Bord and Pillar Method. This paper deals with the use of continuous miner and its success in bord & pillar method of underground coal mining.

  • Room and Pillar Mining Method SlideShare

    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.

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    casino games online for money Jordan loses consciousness after the battle and falls toward the Sun, but is saved by Sinestro, Kilowog, and Tomar-Re. Women were responsible for gathering wild edibles such as berries, tubers, seeds, nuts, vegetables, and wild fruit but could choose to hunt if they wanted to.

  • Underground mining of thick coal seams ScienceDirect

    This paper reviews underground mining methods for total thickness of a thick coal seam in single lift (TTTCSSL). Review shows the required engineering for extraction of thick seams needs to be fitted with thickness of the seam, behavior of rock-mass and surrounding stress conditions for efficient mining.

  • Bord and Pillar Methods. Coal, Colliery and Mining Forum.

    General chat about bord and pillar.

  • Major Mines & Projects Wessels Mine

    Mining Methods. Bord-and-pillar; Summary: Wessels is an underground bord and pillar operation with a current capacity of approximately 1.2 Mtpa of ROM production (100 per cent basis). Processing Technologies. Summary: Primary crushing of ore takes place underground, while secondary crushing forms part of the surface operations. ROM ore is

  • Multi-seam coal mining SciELO

    mine coal (ROM). The mining methods used are a mechanized bord and pillar method that utilizes continuous miners (CM) and a small-scale contractor operated opencast which utilizes trucks and shovels1. There are 5 accepted coal seams in the Witbank coalfield named numerically from 1 to 5 from the bottom2. Mining at Khutala Colliery

  • Digging deeper: Mining methods explained Anglo American

    The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds. We use this for mining coal.

  • Bord and Pillar Methods. Coal, Colliery and Mining Forum.

    General chat about bord and pillar.

  • Major Mines & Projects Wessels Mine

    Mining Methods. Bord-and-pillar; Summary: Wessels is an underground bord and pillar operation with a current capacity of approximately 1.2 Mtpa of ROM production (100 per cent basis). Processing Technologies. Summary: Primary crushing of ore takes place underground, while secondary crushing forms part of the surface operations. ROM ore is

  • Multi-seam coal mining SciELO

    mine coal (ROM). The mining methods used are a mechanized bord and pillar method that utilizes continuous miners (CM) and a small-scale contractor operated opencast which utilizes trucks and shovels1. There are 5 accepted coal seams in the Witbank coalfield named numerically from 1 to 5 from the bottom2. Mining at Khutala Colliery

  • Digging deeper: Mining methods explained Anglo American

    The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds. We use this for mining

  • UNDERGROUND COAL MINING: FACTORS, COST, AND

    UNDERGROUND COAL MINING: FACTORS, COST, AND TIME CONSIDERATIONS Presented by: Definition of Room and Pillar Mining • A system of extracting coal by driving a series of openings referred to as • A high extraction method of mining along the face of a predefined block of coal, referred to as a panel, while allowing the immediate roof

  • Room and Pillar Mining an overview ScienceDirect Topics

    Jürgen F. Brune, in Advances in Productive, Safe, and Responsible Coal Mining, 2019. 6.4 Ventilation of continuous miner faces and sections in coal mines. In the US, underground coal mining is frequently carried out using the room-and-pillar mining method where

  • Tweefontein Mine Mining Industry Data

    Underground mining is conducted using conventional drill and blast methods (including total extraction mining, i.e. stooping), as well as fully mechanised, continuous miner equipment on a bord and pillar system. Opencast mining is undertaken using the strip mining method with dragline.

  • MINING METHODS T cmpdi

    9 Blasting Gallery Method Conventional bord and pillar mining in thick seams is associated with very low percentage of extraction [around 30% in a panel] even under favourable conditions. Extensive development of pillars carried out

  • Underground Mining Methods and Equipment

    UNESCO EOLSS SAMPLE CHAPTERS CIVIL ENGINEERING Vol. II Underground Mining Methods and Equipment S. Okubo and J. Yamatomi ©Encyclopedia of Life Support Systems (EOLSS) Figure 2: Room-and-pillar mining Pillars of original bedrock are left to support rock pressures and to protect personnel.

  • Coal mining Choosing a mining method Britannica

    Coal mining Coal mining Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method

  • Bord & Pillar Method Mining Coal Scribd

    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 mines.

  • v117n2a8 Reflections on narrow-reef platinum mining pillar

    paramount. The success of platinum mining by the bord and pillar method depends heavily on a comprehensive and dependable pillar design method. Pillars need to be large enough to safely support the load and small enough to avoid loss of resources. A critical evaluation of current pillar design systems used in narrow-reef platinum mining was

  • Depillaring: Arrangement, Precautions and Pillar

    After pillars have been formed on the bord and pillar system, consideration has to be given to the extraction of coal from the pillars; the operation is known as pillar extraction. It is also referred to as depillaring, pillar-cutting or broken working. Improper mining methods that create localized extensive stress concentration.

  • PREVIOUS AND CURRENT MINING METHODS.

    Mining method and equipment 4.2.1 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