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  • MSHA Coal Mine Fatal Accident Investigation Report, Coal

    The coal burst damaged the coal ribs of all nine pillars in the rooms, blowing in excess of 1,500 tons coal into the room entries and crosscuts. The blown coal injured six miners, two fatally. The potential for a coal burst was known to the mine operator, especially when mining beneath areas of

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  • Ground Control for Deep Cover Coal Mines s miningquiz

    seam and/or retreat mining scenarios. 9 If the coal seam is high, pillars are prone to rib sloughing. The direction of the face cleat with respect to entries and crosscuts often influences the type of failure, creating for example, vertical slabs of coal along pillar ribs or triangular slabs from pillar corners.

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  • Final Report Effects of Longwall Mining

    The political boundaries of Greene and Washington Counties encompass one of the nation's most renowned coal seams, the Pittsburgh seam. The Pittsburgh coal seam is a single, persistent bed, with an almost horizontal structure and a thickness of four to

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    The coal seam was originally auger mined in the late 1980's. At the time of the accident, the Green Hill Mining, Inc.,GHM #51 was operating with the permission of the surface mine operator, Alden Resources, LLC. Green Hill Mining's intent was to auger mine through the existing auger entries of the coal seam.

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  • Final Report Fatality #9 June 29, 2011 Mine Safety

    The P1 Mine is an underground coal mine owned and operated by Manalapan Mining Co. Inc. The mine is loed in Harlan County, Kentucky, and is developed in the Path Fork coal seam. Mining height ranges from 42 to 90 inches and the mine is accessed by four drift openings.

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    entries • Entries are connected to each other by driving cuts commonly referred to as crosscuts • Remaining coal "blocks", referred to as pillars, support the overlying strata • Size of entries and crosscuts vary from mine to mine – determined by size of equipment employed – thickness of overburden – coal seam thickness

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  • An Innovative Approach for GobSide Entry Retaining in

    the approach was tested on a thick coal seam longwall mining panel. Field monitoring indies that the retained entry was in a stable state and the index of the retained entry met the requir

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  • McDonald Mine The McDonald Mine was loed beneath

    The 1930 WPA mine map shows the main entry for the McDonald Mine as well as the two entries on the northeast where the mine railroad crossed the Montour to enter the opposite hill. The main entry entered the coal seam at about 1,045 feet and extended updip, allowing the

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  • Mine Entry Metadata

    The Coal Authority has records of over 170,000 mine entries within the UK captured in the National Coal Mining Database from a variety of sources including abandonment plans, geological and

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  • Weir International, Inc.

    Two parallel sets of entries are excavated in the coal seam These entries are connected at their far ends by another set of entries to form a block of coal, referred to as the "longwall" Typically, the block of coal is 1,000 feet wide and over one mile long A rotating shearer or plow traverses across the block cutting the coal

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  • Pittsburgh coal seam Wikipedia

    The coal was extracted from drift mine entries into the Pittsburgh coal seam at outcrop along the hillside about 200 feet above the river. The coal was poured into trenches dug into the hillside, rolled to the edge of the river, and transported by canoe and boats to the military garrison.

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  • List of collieries in the Rhondda Valleys Wikipedia

    A level is seen as a horizontal cut into a hill or mountain to access a seam of coal, while a colliery consists of shafts mined into the earth to reach seams of coal underground. Contents 1 List entries

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  • Coal Mining Methods EMFI

    Coal Mining Methods Underground Mining Longwall & Room and Pillar Mining Longwall mining and roomandpillar mining are the two basic methods of mining coal underground, with roomandpillar being the traditional method in the United States. Both methods are well suited to extracting the relatively flat coalbeds (or coal seams) typical of

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  • Overview of Coal Mine Ground Control Issues in the

    More than 75 individual coal seams have been identified in . the basin, of which 20 have been mined (Archer, 1975). The primary producing coal seams in the basin, the Herrin #6 and the SpringfieldHarrisburg #5, are middle Pennsylvanian in age. There are now 30 underground coal mines operating in the basin (Fig. 1).

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  • Contract No.: B2532532 Technology: Inseam Seismic Method

    Technology: Inseam Seismic Method . Contractor: Pennsylvania State University . Summary of technology: The inseam seismic method uses the travel time of reflected channel waves to determine the distance to reflection surfaces such as mine voids. Channel waves attenuate less rapidly than other waves in a typical coal seam, increasing the detection

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  • Room & Pillar Underground Mining West ia Coal

    The initial development of a room and pillar mine, where entries and crosscuts are driven in the coal seam is referred to as primary extraction. Mines using primary extraction only can usually recover 40 to 60 percent of the coal in a given seam and reserve.

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  • Full text of "Three Potential Longwall Mining Methods for

    Seamheight entries increase coal recovery by eliminating or reducing the amount of coal wasted in the roof or floor, provide a larger crosssectional area for ventilating air, and eliminate brow problems at the faceentry inter sections caused by a face being higher than the entries.

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  • Solved: A 6ft Coal Seam At A Depth Of 750 Ft Is To Be Min

    Show transcribed image text A 6ft coal seam at a depth of 750 ft is to be mined by a roomandpillar system incorporating 16ft entries and pillars that are 50 ft square. The K value for the seam is 4,000. Utilizing the Bieniawski formula, determine if these dimensions provide adequate stability.

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  • Ventilation System Design for a ThinSeam Mining Panel

    appliion of backfilling the thinseam entries following mining. KEYWORDS Coal, Thinseam, Ventilation, and Panel Layout. INTRODUCTION In 1990 the production of coal in ia peaked at a little over 46.5 million tons (41.5xl06 t01mes). Since that titne a uniform decline has been stemmed through legislative ac­

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  • Guideline for the Permanent Filling and Capping of Surface

    Guideline for the Permanent Filling and Capping of Surface Entries to Coal Seams NSW Trade & Investment Page 2 of 9 MDG 6001 Prepared by: Mine Safety Operations . Guideline for the Permanent Filling and Capping of Surface Entries to Coal Seams

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  • PA Mining History

    Roomandpillar mining involves driving tunnellike openings to divide the coal seam into rectangular or square blocks. These blocks of coal, or pillars, are sized to provide support for the overlying strata. The openings are referred to as rooms or entries.

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  • COAL_MINE_SEAMS_DANVILLE_IN: Coal Mines in Indiana in the

    COAL_MINE_SEAMS_DANVILLE_IN is a polygonbased ESRI ArcView shapefile that shows the loions and extents of Danville coal mines in the coal region of Indiana. COAL_MINE_SEAMS_DANVILLE_IN includes mine loions and coal seam information from documented surface and underground mines that operated in Indiana since the mid1800s.

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  • Hydrogeology, groundwater flow, and groundwater quality of

    The Pocahontas No. 3 coal seam in southern West ia has been extensively mined by underground methods since the 1880's. An extensive network of abandoned mine entries in the Pocahontas No. 3 has since filled with goodquality water, which is pumped from wells or springs discharging from mine portals (adits), and used as a source of water for public supplies.

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    The Turris Coal Company, a subsidiary of Shell Oil Company, opened a mine near Elkhart in 1982 and since that time has mined over 13,000,000 tons from the Springfield coal seam. In 1993 the mine was sold to the Zeigler /Old Ben Coal Company. In 2004 the mine was sold to I. C. G. Illinois and renamed the Viper Mine, and is still an active mine.

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    Since coal seams and gas in coal are formed together, it is a misnomer to call a coal seam nongassy. All coal seams are gassy by definition, but they vary in their degree of gassiness, i.e., gas content per ton of coal. The depth of a coal seam and its rank are good indiors of its

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    Roomandpillar mining has been used in the United States longer than any other underground method. Mining is accomplished by driving entries off the panel entries. As mining advances, rooms are excavated in the coal seam, the mountain above the seam is supported by pillars of coal left in place.

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  • Coal Zoom Buck Creek Mine Complex in Kentucky Transforms

    Buck Creek Mine Complex in Kentucky Transforms To A Staged High Margin Low Capex Development . February 15, 2016 Paringa Resources Limited has announced the results of a scoping study on the Buck Creek No.2 Mine in Kentucky, which is loed within the Buck Creek mining complex and south of the Buck Creek Mine's proposed 3.8 million tons per annum coal project.

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    entries, 1.5 for panels, and 1.3 for rooms.Entries will be 20 foot wide. Mining with the 70 X 70 foot plan creates 50feet by 50feet pillars and 51% of the coal to support the roof during advancing of the mine. Increasing the cross cut spacing increases the pillar sizes and coal

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  • A Review of Highwall Mining Experience and Practice

    The coal is accessed at the base of the highwall from where a series of parallel entries are driven into the coal seam. The entries are mined using two types of highwall mining systems,

    Authors: Sungsoon Mo · Chengguo Zhang · Ismet Canbulat · P HaganAffiliation: University of WollongongChat Online
  • Chapter 16 Flashcards Quizlet

    network of entries in coal mines cut into a seam a horizontal layer of coal. longwall mining. a machine called a shearer moves back and forth across the face of a coal seam. longwall. the wall of the seam. surface mining. Environmental Sci chapter 16 Mining and Mineral Resources. OTHER SETS BY

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  • Numerical Study on Spontaneous Combustion of Coal in U.S

    The coal source for spontaneous heating can be coal left from the mined coal seam or other overlying or underlying coal seams. In our study, a 2mthick main coal seam was considered, with a 1mthick rider sequence 1 m above the main coal seam. The

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  • Appendix E: Coal Mining and Processing Methods Coal

    In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction. The elements of a surface mining operation are (1) topsoil removal and storage for later use, (2) drilling and blasting the strata overlying the coal seam, (3) loading and

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  • Coal Types, Formation and Methods of Mining epcamr

    Drift mines have horizontal entries into the coal seam from a hillside. Slope mines, which usually are not very deep, are inclined from the surface to the coal seam. Shaft mines, generally the deepest mines, have vertical access to the coal seam via elevators that carry workers and equipment into the mine.

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  • Nonharmonious deformation controlling of gobside entry

    The primary coal seam of the first mining district is loed in the second level, which belongs to the 12th coal bed of Upper Carboniferous Taiyuan Formation. The coal seam dip is 2°–8° and thickness of 1.1–1.37 m. There are 0–3 layers with the thickness of 0.20–0.33 m within the coal seam.

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  • CON29M Residential Mining Report SAMPLE Coal Authority

    4 Mine entries Yes 5 Coal mining geology No 6 Past opencast coal mining No 7 Present opencast coal mining No 8 Future opencast coal mining No 9 Coal mining subsidence Yes 10 Mine gas No investigation of coal seams/former mines of coal may have the potential to generate and/or

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  • Two coalseam fires merge to form rapidlygrowing wildfire

    An aerial photo taken Tuesday of the Louise Creek Coal Seam 2018 Fire about 5 miles northeast of Healy. (Teo Fusco/Alaska Division of Forestry) State Forestry firefighters are working to contain a

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  • Archived: Interstate Technical Group on Abandoned

    Irrespective of which survey method is used (fenceline or tomography), the detection of voids (mine entries) within a coal seam using RIM is based entirely on the waveguide behavior of the coal seam itself. The RIM EM wave travels in a "trapped" mode in the coal

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    Bleeder entries are special air courses designed and maintained as part of the mine ventilation system. This chapter focuses on the design, examination, maintenance, and evaluation of bleeder systems in underground coal mines. The history of coal mine explosions in the United States is a reminder of the importance of adequate ventilation.

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