ICGCM Papers:
Pillar Design Workshop
 
 
Pillar Stability and Coal Bumps – Case Histories of Retreat Mining in the Thick Overburden and Multiple Seam Environment of Appalachia
Pillar Mechanics Workshop Proceedings 2010
Pillar Stability and Coal Bumps – Case Histories of Retreat Mining in the Thick Overburden and Multiple Seam Environment of Appalachia
by
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David Newman, President Appalachian Mining and Engineering, Inc. Lexington, KY
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[Book] Pillar Mechanics Workshop Proceedings 2010
[Topical Area] Pillar Design Workshop
[Author] 
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David Newman, President Appalachian Mining and Engineering, Inc. Lexington, KY
[Abstract] 
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Multiple seam underground coal mining under deep overburden is ubiquitous in Southern Appalachia. Many coal properties have from two to ten or more economically mineable coal seams with overburden ranging between 1,000 and 2,200 ft. Ground control engineering and mine planning may require incorporation of undermining and/or overmining where the geometry of the abandoned mine(s) is frequently incongruous with modern mining methods and layout. The overburden and interburden commonly consists of strong rock, sandstone, and sandy shales with a lesser percentage of weak shales, claystone, mudstone, and fireclay. Strong competent strata are beneficial to roof conditions on advance but frequently are detrimental to the ability to initiate caving.