wedges coal mines

  • More Coal Mining Forest of Dean

    11 Sep 2013 On reaching the seam coal between the drifts was removed to create a working face In this mine the floor was clay fire clay and the roof was a hard shale The coal was removed by undercutting the seam using a narrow pick to dig out a thin band of clay below the coal Wedges could then be driven in nbsp …

  • Effect of discontinuities characteristics on coal mine stability and

    The method is based on the analysis of structural data and the geometry and stability of wedges in underground coal mines In this regard an accident causing a huge collapse in a coal mine leading to 4 fatalities is illustrated by way of a case study Horizontal and vertical profiles are prepared by geophysical methods to nbsp …

  • Coal burst induced by rock wedge parting slip a case study in

    Fully mechanised mining process was used when the coal burst occurred at the longwall face which is located in mining area at the Zhaolou coal mine Its east is the inclined roadway and the west is the boundary of mining area the north is the goaf of coal nbsp …

  • Ground Failures in Coal Mines with Weak Roof Centers for

    However rock fall accidents and injuries continue to occur in coal mines that have been supported according to the NIOSH has investigated roof failure in a number of coal mines in order to illustrate the causes and conditions The Energy shale occurs in large wedges and represents overbank deposits from the ancient …

  • Pit Terminology Healey Hero

    I have also used 39 A Pit Terminology Glossary Used in Coal Mining 39 a publication compiled by William Stukeley Gresley dated 1883 and given to me by Philip Wyles Cams Cambered Slightly curved girders set at roof level for gate support jabbed and wedged into a roadway side and not supported by legs …

  • Glossary of Mining Terms Kentucky Coal Education

    Abutment In coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch of strata spanning the roadway and 2 the weight of the Wedge A piece of wood tapering to a thin edge and used for tightening in conventional timbering …

  • Achieving higher pull and yield in solid blasting IR CIMFR

    different gee mining conditions following common blasting patterns of wedge cut fan cut etc have never bccn considered satisfactory for optimum utilisation of men and machincs at faces and more so with introduction of semi mechanization in most of the undergron coal mines 2 1 has been a great challenge for the nbsp …

  • Improving the Safety of Batteries in Underground Coal Mines

    17 Oct 2017 The presence of released methane CH4 gas and coal dust both of which result from various coal mining processes that occurs within the coal mine for evaluating the safety of Li ion batteries a study by NIOSH developed a method that involved a 90° wedge shaped plastic fixture to compress the Li cell …

  • Making a Mine

    Making A Mine This page describes the various stages of making a mine from digging the first sod to getting actually to the coal face The tools of the miner consisted of a sledge eight to ten pounds in weight several steel wedges six to eight inches long three to six picks from two and a half to three pounds in weight with nbsp …

  • Coal Mining University of Kentucky

    A wedge of overburden is removed along the coal outcrop on the side of a hill forming a bench at the level of the coal After the coal is removed the overburden is placed back on the bench to return the hill to its natural slope Mountaintop removal mines are special area mines used where several thick coal seams occur nbsp …

  • Coal Mine Bumps as Related to Geologic Sunnyside District

    Coal mine bumps as related to geologic features in the northern part of the Sunnyside District Carbon County Utah I by Frank W Map showing boundaries of coal mines and major geologic features in the Sunnyside coal mining district vertical succession of thin interlocking or overlapping wedge shaped layers …

  • MINEmTlMBER MARKET Forest Service

    Figure 2 Examples of timbers used in the underground bituminous coal mining industry planking wedges crib blocks construction and repair and a number of minor uses fig 2 As coal is extracted from the cod seam roof support timbers are set and depending on the mine or area in the mine mine ties are laid flooring nbsp …

  • Cutting Processes Introduction underground COAL

    This is achieved by quot snaking quot the AFC on which the shearer travels so that the cutter drum can cut a wedge shaped section of coal until the full depth of the web is attained The best system will often be different for different mines particularly in different seam thicknesses and possibly even with different personnel …

  • Mining STS Systems

    STS provides technical expertise products and systems for mining ground control and tunnel excavations services in coal and hard rock mining economic high quality production and on time sourcing We also have a range of STS products including tensioning jacks hydraulic pumps and hosing wedges and barrels …

  • Coal Mining Encyclopedia of Alabama

    18 Feb 2008 In slope and shaft mines miners removed coal in a four step process undercutting drilling blasting and loading First miners used picks to carve a 3 to 4 foot wedge into the lower part of the face of the coal seam usually on their knees or lying on their sides Next miners used a 5 1 2 foot long auger with nbsp …

  • Mining Methods Rhino Resource Partners

    Underground mines in the United States are typically operated using one of two different methods room and pillar mining or longwall mining In room and pillar mining A wedge of overburden is removed along the coal outcrop on the side of a hill forming a bench at the level of the coal After the coal is removed the nbsp …

  • Coal burst induced by rock wedge parting slip a case study in

    Coal burst induced by rock wedge parting slip a case study in Zhaolou coal mine The evolution of microseismic source locations in the coal face was also obtained to correlate rock wedge parting with coal burst Keywords Rock wedge parting stick slip model coal burst source evolution stress superposition nbsp …

  • Coal Mining Context for Illinois Fever River Research

    15 Mar 2005 PICK SHOVEL WEDGE AND SLEDGE A HISTORICAL CONTEXT FOR EVALUATING COAL MINING RESOURCES IN ILLINOIS By Floyd Mansberger and Christopher Stratton Fever River Research Inc Springfield Illinois Prepared for Illinois Department of Natural Resources Springfield Illinois …

  • The Work of a Coal Miner in the Gilded Age and Progressive Era

    Look at the pictures carefully and study the accompanying text in order to learn about the work of coal miners and how the work changed over the course of time The tools of the miner consist of a sledge eight to ten pounds in weight several steel wedges six to eight inches long three to six picks from two and a half to nbsp …

  • Geologic Hazards and Roof Stability in Coal Mines CDC stacks

    Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Geologic Hazards and Roof Stability in Coal Mines Fatalities caused by the fall of roof and rib in U S coal mines 1983 99 Wedge shaped lag deposit forms a weak drawrock in coal mine roof in southeastern Ohio …

  • Aspir™ Wedge Wire Baskets Weir Group

    Overview The Aspir™ range of Australian made wedge wire centrifuge baskets are designed to deliver optimum results in coal mining and industrial applications including particle separation dewatering and classification …

  • Wedge Anchorage DSI Underground Systems

    DSI Underground Systems Inc operation of the Wedge Anchorage for Cable Bolts …

  • Deaths from mining at Denniston 1881–1906 – Coal and coal

    12 Jun 2006 2 June 1884 Banbury Thomas Henderson 54 Experienced miner wedging down coal hit by fall of stone from false roof 14 July 1884 Koronui John McCormack 66 Walking down incline between tracks Hit by truck 15 November 1887 Coalbrookdale Edward Jones 34 Fall of wedge shaped piece of nbsp …

  • wedge cut – Mining and Blasting

    23 Jul 2009 Posts about wedge cut written by PARTHA DAS SHARMA …

  • Coal Mining Tools Bridgeport Historical Society

    The basic tool for the miners was a pick Most of the picks had handles like the one in the photo showing all the tools However some did not have handles due to the limited space in the tunnels The picks broke the coal loose from the veins A hammer and wedge was used to reduce the size of a large block of coal so that it nbsp …

  • Power Wedge Mechanical Pre Stressing Strata Worldwide

    The Power Wedge Mechanical Pre Stressing Device applies active roof loads from prop type supports Power Wedge converts torque into upward roof force generating pre stressing loads up to 10 tons Torque is applied with a 1 1 8 quot 29 mm socket via hand wrench air or hydraulic tool The unit enables pre stressing nbsp …

  • In the Black Cap Wedge Daily Yonder

    7 Nov 2016 7661052 orig Before roof bolting became common the top was supported by wooden timbers held n place with a cap wedge In modern mining they still used to secure bratices and in emergencies Photo 1912 in the Hanna coal mines University of Wyoming Cap Wedge had worked for Alpha Natural nbsp …

  • Underground Mine Black Country Living Museum

    Underground Mine Mind yer 39 ed Take a trip with 39 Lija Wedge 39 into the world of the Black Country coalminer in the 1850s The Black Country was famous for the Staffordshire Thick Coal which lay beneath much of the area The coal occurred in seams of up to 10 metres thick far bigger than anywhere else in Britain and the nbsp …

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