Interactions Between Multiple Seam Longwall and Room-and-pillar Operations

A Case Study in Boone County, WV

by Alexander May, Bernard J. Steblay, Gregory J. Chekan, Gregory M. Molinda, Howard W. Kilau, J. Alton Burks, John C. Edwards, Richard J. Mainiero, Roy H. Grau, Thomas M. Barczak, David K. Ingram, James Reid Boyle, Lon D. Santis, Rudy J. Matetic, Thomas C. Ruhe, Thomas E. Marshall, Ellsworth R. Spencer · 1989