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sandstone coal mine roof

Definition and formation Sandstone is a common roof rock above many coal beds It is especially common beneath paleochannel deposits and transitional with some stackrock deposits Thicksandstone mine roofs commonly offer good roof conditions Sandstone tops may have local weaknesses along bedding however which can lead to roof falls

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    sandstone and limestone The Coal Mine Roof Rating CMRR ranges from 3083 and averages 44 The depth of cover ranges from 25900 ft and averages 325 ft Coal mine roof that falls before the installation of roof bolts can be hazardous From 19952008 24 miners were killed while travelling beneath unsupported roof MSHA 19952008

  • sandstone coal mine roof
    sandstone coal mine roof

    Definition and formation Sandstone is a common roof rock above many coal beds It is especially common beneath paleochannel deposits and transitional with some stackrock deposits Thicksandstone mine roofs commonly offer good roof conditions Sandstone tops may have local weaknesses along bedding however which can lead to roof falls

  • Mapping techniques for determining sandstone roof
    Mapping techniques for determining sandstone roof

    ABSTRACT Sandstone channels are constant hazards to coal mining operations the presence of a channel over a seam can result in thinning of the seam changes in stress orientations variation in stress intensity abrasive cutting roof hangup faulting jointing loading of the face and even wind blasts

  • Application of coal mine roof rating in Chinese coal mines
    Application of coal mine roof rating in Chinese coal mines

    The coal mine roof rating CMRR is a measure of roof quality or structure competency for bedded roof types typically of underground coal mines The CMRR has been used widely in the US South Africa Canada and Australia

  • Coal bursts that occur during development A rock
    Coal bursts that occur during development A rock

    At Bowie the roof is usually composed of interbedded siltstone fossiliferous shale and thin layers of sandstone Coal mine roof rating CMRR values typically range between 40 and 60 with typical UCS values of 50–80 MPa The immediate floor usually contains a considerable thickness of coal

  • Mine Roof Condition and the Occurrence of Roof Falls in
    Mine Roof Condition and the Occurrence of Roof Falls in

    the time when the roof was sandstone and 12 of the time when coal was left to protect the shales while 80 of roof falls occurred when the roof consisted of unprotected shales The best quality roof consists of well consolidated graywacke sandstones which are generally about 3 m thick and laterally continuous for more than 600 m Home et al 1978

  • Mapping techniques for determining sandstone roof
    Mapping techniques for determining sandstone roof

    2014 Coal Operators’ Conference The University of Wollongong 18 12 – 14 February 2014 MAPPING TECHNIQUES FOR DETERMINING SANDSTONE ROOF CHANNEL PALEODRAINAGE DIRECTION IN COAL MINES Luc Daigle1 ABSTRACT Sandstone channels are constant hazards to coal mining operations the presence of a channel over a seam can result in thinning of the seam changes in

  • Geologic Hazards and Roof Stability in Coal Mines
    Geologic Hazards and Roof Stability in Coal Mines

    GEOLOGIC HAZARDS AND ROOF STABILITY IN COAL MINES By Gregory M Molinda1 ABSTRACT The US underground coal miner faces a continuing hazard from the fall of roof At the root of many injuries and fatalities are weak or defective roof strata Throughout mining history millions of

  • Influences of Water Vapor on Roof Fall Accidents in
    Influences of Water Vapor on Roof Fall Accidents in

    Coal mines showed the highest rate that is 175 roof fall injuries per 200000 h underground work The Mine Safety and Health Administration MSHA of the US reported seven fatalities 278 nonfataldayslost NFDL injuries and 152 nodayslost NDL injuries on 2006 because of roof falls in US underground coal mines The main consequences

  • MSHA  Coal Mine Fatal Accident Investigation Report Fall
    MSHA Coal Mine Fatal Accident Investigation Report Fall

    The immediate mine roof consists of gray shale to siltstone sandstone or interbedded shales and sandstone known as stackrock Employment is provided for 194 underground and 18 surface employees The mine is operated three shifts per day five days per week producing 21000 tons of raw coal per day from two continuous mining machine units

  • Stackrock mine roofs Coal Kentucky Geological Survey
    Stackrock mine roofs Coal Kentucky Geological Survey

    Stackrock conditions are potential rooffall hazards modified from Greb and Cobb 1987 Large stackrock falls in above the Pond Creek coal from a mine in eastern Kentucky Trends Stackrock situations formed from channel flooding have more predictable trends than those formed in other situations In cross section both levee and splay

  • Development and Application of the Coal Mine Roof
    Development and Application of the Coal Mine Roof

    The Coal Mine Roof Rating CMRR was developed 10 years ago to fill the gap between geologic characterization and engineering design It combines many years of geologic studies in underground coal mines with worldwide experience with rock mass classification systems Like other classification systems the CMRR begins with

  • Concretions in mine roofs Coal Mining Geology Kentucky
    Concretions in mine roofs Coal Mining Geology Kentucky

    Large concretion that fell from between bolts in a dark gray shale roof from Greb and Cobb 1987 Trends Concretions are generally randomly distributed in darkshale mine roofs Where shales coarsen upward concretions sometimes occur at the vertical transition from shale to siltstone in the roof

  • IC 9313 Roof control of stress relief jointing near
    IC 9313 Roof control of stress relief jointing near

    ROOF CONTROL OF STRESSRELIEF JOINTING NEAR OUTCROPS IN CENTRAL APPALACHIAN DRIFT COAL MINES By Gary P sarnes and Noel N Moebs1 ABSTRACT This report discusses some practical applications of a geotechnical investigation conducted by the US Bureau of Mines that can help mine operators meet revised Federal regulations in their roof control plans

  • Observations and analyses of roof T guttering in a coal
    Observations and analyses of roof T guttering in a coal

    Observations and analyses of roof guttering in a coal mine To eliminate control or minimize the risk of rockfalls pillar failure and roof and floor failure as a result of the instability associated with bord and pillar mining it is necessary to understand the distribution of stress and

  • Mine Roof Condition and the Occurrence of Roof Falls
    Mine Roof Condition and the Occurrence of Roof Falls

    ABSTRACT Mine roof fall characteristics of 250 falls in 5 different roomandpillar coal mines located in Pike Martin and Floyd counties Kentucky were investigated to determine the relationship of selected parameters associated with roof failure and the assumed condition of the mine roof before failure The selected parameters used in

  • PDF Coal Mine Roadway Stability in Soft Rock A Case
    PDF Coal Mine Roadway Stability in Soft Rock A Case

    Coal Mine Roadway Stability in Soft Rock A Case Study tigate roadway failures and roof behaviour of coal mining activities B roof sandstone 1842 784 836 220

  • Glossary of Mining Terms  Coal Education
    Glossary of Mining Terms Coal Education

    A 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 rocks over a longwall face is transferred to the front abutment that is the solid coal ahead of the face and the back abutment that is the settled packs behind the face

  • Final Report  Fatality 5  February 23 2017  Mine
    Final Report Fatality 5 February 23 2017 Mine

    The mine roof was not properly supported or controlled where miners were required to work and travel on the 001 MMU On February 23 2017 a section of loose draw rock fell from the mine roof in the 3 entry 1 crosscut inby SS 804 on the active 001 MMU and fell onto a miner working on the section

  • Jackson County Michigan Historic Coal Mines
    Jackson County Michigan Historic Coal Mines

    The Hayden Reynolds properties had mines adjacent to Sandstone Creek Test drilling located coal northward toward and then around the Village of Woodville Coal supplied the main west – east railroad That railroad today is the New York Central There are many mines located near Sandstone Road Mines run from just north of Slayton Road

  • Final Report  Fatality 5  February 23 2017  Mine
    Final Report Fatality 5 February 23 2017 Mine

    The mine roof was not properly supported or controlled where miners were required to work and travel on the 001 MMU On February 23 2017 a section of loose draw rock fell from the mine roof in the 3 entry 1 crosscut inby SS 804 on the active 001 MMU and fell onto a miner working on the section

  • DEPARTMENT OF LABOR MINE SAFETY AND HEALTH
    DEPARTMENT OF LABOR MINE SAFETY AND HEALTH

    The mine roof was in a transition zone beginning in the crosscut outby the accident scene The shale roof changed to laminated sandstone approximately four feet above the coal seam The operator mined the shale up to the sandstone to increase the mining height because the shale would try to separate and fall from the sandstone when a thin

  • UNDERGROUND COAL INE Herrin No 6 Stratigraphy
    UNDERGROUND COAL INE Herrin No 6 Stratigraphy

    which promote separation of the layers in roof falls The sandstone is slightly permeable and is believed to be the main source of water that seeps from the roof into mine workings The channel phase of the sandstone occurs in one major channel and several

  • COAL MINES AS LOCALITIES FOR STUDYING DINOSAUR
    COAL MINES AS LOCALITIES FOR STUDYING DINOSAUR

    Selected coal pillars which support the roof have been removed in some mines allowing overburden to fall to the floor These Figure 2 Coal mine in the Kenilworth Coal near Kenilworth Utah east of Helper showing numerous overlapping roundbottomed dinosaur footprint casts extending down from the roof

  • Coal Mines  Utah State University Eastern
    Coal Mines Utah State University Eastern

    As the shearer moves back and forth cutting the coal the coal falls onto a conveyor belt and carried out of the mine As the track is pushed forward on hydraulics the roof is allowed to collapse behind hydraulic roof supports called shields that protect the miners

  • Observations and analyses of roof T guttering in a coal
    Observations and analyses of roof T guttering in a coal

    Observations and analyses of roof guttering in a coal mine To eliminate control or minimize the risk of rockfalls pillar failure and roof and floor failure as a result of the instability associated with bord and pillar mining it is necessary to understand the distribution of stress and

  • Full text of Geologic conditions affecting coal mine
    Full text of Geologic conditions affecting coal mine

    £ Most clastic dikes in western coal mines are of a sandstone texture and can enter the coalbed from either the roof or the floor 30 Figure 33 shows a clastic dike that entered the coalbed from below and failed to completely transect it

  • CHAPTER 1 INTRODUCTION  UPSpace
    CHAPTER 1 INTRODUCTION UPSpace

    CHAPTER 1 INTRODUCTION Dorstfontein Coal Mine is situated at the northern limb of the Highveld Coalfield Snyman 1998 The close proximity of the Nebo Granite Suite SACS 1980 which outcrops near the boxcut to the No2 Seam makes it a very difficult mine to operate The coal seam mimics the granite paleo­

  • Analysis of alternatives for using cable bolts as primary
    Analysis of alternatives for using cable bolts as primary

    Various solutions using cable bolts as primary support were attempted at two lowseam coal mines in Western Pennsylvania that were experiencing difficult roof conditions Sandstone is occasionally found close to the coalbed being mined but typically was found no closer than 24 m above the coal bed in the area studied at Mine B

  • Glossary of Mining Terms  Coal Education
    Glossary of Mining Terms Coal Education

    A 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 rocks over a longwall face is transferred to the front abutment that is the solid coal ahead of the face and the back abutment that is the settled packs behind the face

  • coal mine roof bolt coal mine roof bolt Suppliers and
    coal mine roof bolt coal mine roof bolt Suppliers and

    558 coal mine roof bolt products are offered for sale by suppliers on of which mining machinery parts accounts for 29 mine drilling rig accounts for 20 and anchors accounts for 5 A wide variety of coal mine roof bolt options are available to you There are 558 suppliers who sells coal mine roof bolt on mainly

  • Coal Resources of Butler County Pennsylvania
    Coal Resources of Butler County Pennsylvania

    Coal Resources of Butler County Pennsylvania By ELMER D PATTERSON and J A VAN LIEU COAL RESOURCES OF WESTERN PENNSYLVANIA G E 0 L 0 G I C A L S U R V E Y B U L L E T I N 114 3C Prepared in cooperation with the

  • Signal Peak Makes Longwall Recovery History  Coal Age
    Signal Peak Makes Longwall Recovery History Coal Age

    The overburden above the Mammoth coal seam in the 13 Right recovery areas is approximately 200 ft The roof consists of shale siltstonesandstone and rider coal Rehder coal seam The location of the Rehder seam changes and when it comes close to the roof line roof instability may occur if sufficient roof support is not installed

  • Jackson County Michigan Historic Coal Mines
    Jackson County Michigan Historic Coal Mines

    The Hayden Reynolds properties had mines adjacent to Sandstone Creek Test drilling located coal northward toward and then around the Village of Woodville Coal supplied the main west – east railroad That railroad today is the New York Central There are many mines located near Sandstone Road Mines run from just north of Slayton Road

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