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Design Strategies -Because NSA recommends designing for the maximum mining <br />height expected in a panel, designing for a lower mining height and limiting mining may • <br />be advantageous if only a small portion of the panel contains thicker coal, especially if <br />that coal is under deep cover. Also, in areas where the cover increases rapidly from the <br />highwall. due to seam dip, topography. or a combination, higher tonnages may be <br />realized by limiting miner penetration. This limits design depth and may allow for <br />reduced web pillar sizes and overall higher recovery. These situations would have to be <br />evaluated on an individual basis to determine the total recovery associated with different <br />design strategies. <br />REFERENCES <br />Fiscor. Steve. 2002. Contour Mining Pu[s Highwa]] System to the Test. Coal Age, July, <br />PP 20-22. <br />Heasley, K.A.. and M.D.G. Salamon, 1996. 1Vew Laminated Displacement-Discontinuity <br />Program: Fundamental Behavior. Proc, 15's Intl Conf on Ground Control in Mining, <br />Colorado School of Mines. Golden. CO. August 12-15; pp 11 ]-125 <br />Highwa]] Mining Services. ]998. Auger Panel Design Study: Seneca IIW and Yoast <br />Mines. Seneca Coa] Company. Report to Seneca Coal Co., Sept. 56 pp. <br />Jaeger, J.C.. and N.G.W. Cook. ] 969. Fundamentals of Rock 1.9echanics. Halsted Press, • <br />585 pp. <br />Karabin. G. J., and M. A. Evanto. 1994. Experience With the Boundary Element Method <br />of Numerical Modeling as a Tool to Resolve Comolex Ground Control Problems. Proc. <br />13`h Int. Conf. On Ground Control in Mining, Aug. 2-4, 1994, Morgantown, WV, l3 pp. <br />Mark. C., F. E. Chase, and A. A. Campoli. ] 995. Analysis of Retreat Mining Pillar <br />Stability. Proc. 14`h Conf. On Ground Control in Mining. Morgantown, WV, Aug. I-3. <br />1995. pp. 63-71. / <br />Mark. C., and T.M. Barton. 199%. Pillar Design and Coal Strength. Proceedings: New <br />Technology for Ground Control in Retreat Mining. NIOSH 1C 9446, pp. 49-59. <br />Molinda. G.M.. and C. Mark. ]994. Coal Mine Roof Rating (CMRR): A Practical Rock <br />Mass Classification for Coal Mines. USBM ]C 9387; 83 pp. <br />• <br />Seneca Coal Companv 2~ NSA Engineering. In:. <br />Highu~all A9ine Design Report lone?003 <br />