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Multiple-seam mining interactions: case histories from the Harris No. 1 mine.

Chase-FE; Worley-P; Mark-C
Proceedings: New Technology for Ground Control in Multiple-Seam Mining. Mark C; Tuchman RJ, eds., Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2007 May; :63-71
The Harris No. 1 Mine 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 that have been conducted in the overlying No. 2 Gas Coalbed. The problems have included roof falls, excessive rib sloughage, and gate road and bleeder entry closure. A detailed evaluation of the multiple-seam experiences at Harris No. 1 Mine was done as part of NIOSH's nationwide multiple-seam mining case history database. One observation was that smaller, critically loaded, upper-seam pillars seemed to cause more severe ground conditions than wider pillars. The LaMODEL program was used to investigate this. Results confirmed that critical-sized pillars 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 an ALPS stability factor of less than 1.50.
Ground-control; Injuries; Coal-mining; Safety-research; Hazards; Mining-industry; Longwall-mining; Multiple-seam-mining; Models; Geology
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Proceedings: New Technology for Ground Control in Multiple-Seam Mining