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Mining Publication: Multiple Seam Mining Interactions: Case Histories from the Harris No. 1 Mine

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.

Original creation date: August 2005

Image of publication Multiple Seam Mining Interactions: Case Histories from the Harris No. 1 Mine

The Harris No. 1 Mine, located in Boone County, WV, has been longwalling the Eagle Coalbed for over 30 years. Harris has experienced numerous interactions associated with the extensive room-and-pillar and longwall mining operations which have been conducted in the overlying No. 2 Gas Coalbed. The problems have included roof falls, excessive rib sloughage, and gateroad and bleeder entry closure. A detailed evaluation of the multiple seam experiences at Harris No. 1 Mine was conducted as part of the National Institute for Occupational Safety and Health (NIOSH) nation-wide multiple seam mining case history data base. One observation from the Harris gateroad case histories was that smaller, critically loaded, upper seam pillars seemed to cause more severe ground conditions than did wider pillars. The LaModel program was used to investigate this supposition, and the results confirmed that "critical" sized pillars do transmit the highest amounts of stress to adjacent seams. In addition, the data suggest that the probability of a major multiple seam mining interaction increases when the depth of cover is 1,000 ft or greater and when the Eagle seam pillars have a Analysis of Longwall Pillar stability factor less than 1.50.

Authors: FE Chase, P Worley, C Mark

Conference Paper - August 2005

NIOSHTIC2 Number: 20028270

In: Peng SS, Mark C, Finfinger GL, Tadolini SC, Heasley KA, Khair AW, eds. Proceedings of the 24th International Conference on Ground Control in Mining, Morgantown, West Virginia, August 2-4, 2005. Morgantown, WV: West Virginia University, 2005; :79-86