coal mining pillar extraction

  • 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.

  • Room and pillar mining Wikipedia

    Room and pillar mining was one of the earliest methods used, although with significantly more man-power. The room and pillar system is used in mining coal, gypsum, iron, and uranium ores, particularly when found as manto or blanket deposits, stone and aggregates, talc, soda ash and potash.

  • Coal mining Wikipedia

    Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine a pit, and the

  • Coal mining World Coal Association

    In room-and-pillar mining, coal deposits are mined by cutting a network of 'rooms' into the coal seam and leaving behind 'pillars' of coal to support the roof of the mine. These pillars can be up to 40% of the total coal in the seam although this coal can sometimes be recovered at a later stage.

  • Toward Pillar Design to Prevent Collapse of Room-and

    Table 1 Value and production by room-and-pillar mining in the United States Commodity Total U.S. production, Room-and-pillar mining Typical extraction, tons Percentage Tonnage Value, million U.S. dollars % Coal1 1,014,000,000 20 202,000,000 $3,550 60 Lead2 493,000 90 444,000 $432 75 Zinc2 722,000 60 433,000 $491 75

  • PA Mining History

    Coal Mining in Pennsylvania PA Mining History. Room-and-pillar mines have been active in Pennsylvania's bituminous coalfields since the late-1700s. Bituminous coal was first mined in Pennsylvania at "Coal Hill" (Mount Washington), just across

  • Sizing of Final Stumps for Safer Pillar Extraction

    in underground coal mining. Safety requires that the roof above the intersection remain stable until after the pillar has been extracted. Artificialsupports (timbers and Mobile Roof Supports) are essentialto roof stability, but so is the final remnant stump or pushout. Traditional mining practices usually called for the complete extraction of the final stump, but the recent trend (both in the

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  • Pillar design in coal mines SlideShare

    May 06, 2011· pillar design in coal mines, different pillar design approaches, salmon versus sheorey formulae, panel stability, diffrent approaches, local mine stiffness Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

  • Panel & Pillar Extraction Mining Science and Technology

    Problems encountered with the Old Ben system prompted the design of Wongawilli system of Pillar extraction, and the following parameters were set: 1. Provision of a single working place 2. Extraction of coal in stress relieved areas 3. Utilisation of the coal in stress as a support 4. Maximise extraction of []

  • Risk management of underground coal pillar extraction in

    Risk management of underground coal pillar extraction in South Africa Article in International Journal of Surface Mining Reclamation and Environment 19(3):218-233 · September 2005 with 49 Reads

  • Sizing of Final Stumps for Safer Pillar Extraction

    summarized in U information Circular 8849, “Room and Pillar Retreat Mining, A Manual for the Coal Industry” (6). The study found that about 38% of all U.S. mines employed room and pillar Sizing of Final Stumps for Safer Pillar Extraction

  • Toward Pillar Design to Prevent Collapse of Room-and

    TOWARD PILLAR DESIGN TO PREVENT COLLAPSE OF ROOM-AND-PILLAR MINES R. Karl Zipf, Jr. Room-and-pillar mining Typical extraction, tons Percentage Tonnage Value, million U.S. dollars % coal mine failures, usually much less than 1 in metal-mine failures, and less than about 2 for nonmetal mine

  • Coal mining World Coal Association

    In room-and-pillar mining, coal deposits are mined by cutting a network of 'rooms' into the coal seam and leaving behind 'pillars' of coal to support the roof of the mine. These pillars can be up to 40% of the total coal in the seam although this coal can sometimes be recovered at a later stage.

  • Pillar Extraction an overview ScienceDirect Topics

    Extraction of coal from a pillar between two roads is practised in both cases. With bord and pillar mining and subsequent extraction of pillars dependent on the size of room and pillar widths some 30% of part of a deposit is exposed through development and roads. With longwall mining only 5% is involved in this way.

  • (PDF) COAL MINING METHODS ResearchGate

    While extraction of all the coal in a pillar is a desirable objective, partial pillar extraction schemes are more comm on. At depths greater than 400 to 500 metres, room-and- pillar

  • Coal Mining Methods emfi.mines.edu

    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

  • Appendix E: Coal Mining and Processing Methods Coal

    Underground mining is usually by the room-and-pillar mining or longwall mining method ().Even in mines where the longwall method is the principal extraction method, the development of the mine and the longwall panels is accomplished by room-and-pillar continuous mining.

  • Coal pillar extraction experiences in New South Wales

    extraction mining technique (longwalling) is widely used, as it is inherently safer than pillar extraction1. The use of longwalling as a high extraction mining technique in the USA and Australia was initially stifled as a result of competent overburden creating roof control difficulties with the earlier types of longwall supports.

  • Pillar Extraction SpringerLink

    Abstract. Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar extraction methods, with numerous

  • Rock-n-Roll Coal .mpg YouTube

    Sep 08, 2011· Here is a pillar fall at the mines that I work! This is wild to watch!

  • Coal mining Underground mining Britannica

    Often the extraction of coal from the seam during mine development is called “first mining”; the extraction of the remaining seam is called “second mining.” Mining methods Modern underground coal-mining methods can be classified into four distinct categories: room-and-pillar,

  • 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.

  • Pillar extraction Article about pillar extraction by The

    Find out information about pillar extraction. Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining Explanation of pillar extraction. Pillar extraction Article about pillar extraction by The Free Dictionary.

  • Coal pillar extraction experiences in New South Wales

    extraction mining technique (longwalling) is widely used, as it is inherently safer than pillar extraction1. The use of longwalling as a high extraction mining technique in the USA and Australia was initially stifled as a result of competent overburden creating roof control difficulties with the earlier types of longwall supports.

  • Coal mining Underground mining Britannica

    Often the extraction of coal from the seam during mine development is called “first mining”; the extraction of the remaining seam is called “second mining.” Mining methods Modern underground coal-mining methods can be classified into four distinct categories: room-and-pillar,

  • Panel & Pillar Extraction Mining Science and Technology

    Problems encountered with the Old Ben system prompted the design of Wongawilli system of Pillar extraction, and the following parameters were set: 1. Provision of a single working place 2. Extraction of coal in stress relieved areas 3. Utilisation of the coal in stress as a support 4. Maximise extraction of []

  • Pillar extraction Article about pillar extraction by The

    Find out information about pillar extraction. Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining Explanation of pillar extraction. Pillar extraction Article about pillar extraction by The Free Dictionary.

  • 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.

  • Appendix F: Underground Coal Mining Methods and

    FIGURE F-1 Schematic of a room-and-pillar coal mine section. SOURCE: Arch Coal, Inc., 2012. FIGURE F-2 Details of the longwall face. SOURCE: EIA, 1995. There are several variations of each method. However, ever since the introduction of continuous miners in the late 1940s, room-and-pillar continuous mining has been gaining ground over conventional room-and-pillar mining.

  • CDC Mining Deep Cover Pillar Extraction in the U.S

    Mining Publication: Deep Cover Pillar Extraction in the U.S. Coalfields. Keywords: statistics indicates that deep cover pillar recovery accounts for a disproportionate share of the underground coal mine roof/rib fall fatalities and injuries. Past research has shown that previously recommended Analysis of Retreat Mining Pillar Stability

  • PA Mining History

    Coal Mining in Pennsylvania PA Mining History. Room-and-pillar mines have been active in Pennsylvania's bituminous coalfields since the late-1700s. Bituminous coal was first mined in Pennsylvania at "Coal Hill" (Mount Washington), just across

  • Research Report on the Coal Pillar Recovery under Deep

    RESEARCH REPORT ON THE COAL PILLAR RECOVERY UNDER DEEP COVER a study of the recovery of coal pillars through retreat room-and-pillar mining practices in underground coal mines at depths greater than 1,500 ft. The study with emphasis on the impact of full or partial pillar extraction mining. The study should include, but not be limited

  • 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 to use in extracting a coal seam depends on many

  • Underground Coal Mining YouTube

    Apr 25, 2014· A view from the drivers seat going into a mine where they use the room & pillar mining technique and another clip showing the longwall mining operation. Underground Coal Mining MineralsInYourLife.

  • EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

    ―Evaluation of Underground Coal Pillar Design‖ and later on for his inspiring guidance, Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an ore body, vein or (coal) seam. Mining

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  • Pillar Extraction Methods AusIMM

    A pillar ‘is a block of coal left in the first working of a coal seam for the purpose of supporting the superincumbent strata in such a manner that the winning out roadways will be safe to traverse by men and by the coal transport system. PRINCIPLES OF PILLAR EXTRACTION. The size of a pillar...

  • SOUTH AFRICAN COAL SECTOR REPORT

    The most economical method of coal extraction from coal seams depends on the depth and quality of the seams, as well as the geology and environmental factors. Surface (opencast) mining and deep underground mining are the two basic methods of mining used in South Africa. Approximately 51% of South African coal mining is done underground and