Laserfiche WebLink
• <br />POWDERHORN COAL COMPANY <br />TABLE 20-2 <br />PREDICTED MAXIMUM VERTICAL SUBSIDENCE <br />WITH RESPECT TO PILLAR SIZE AND DEPTH <br />• <br /> PILLAR SIZE <br />DEPTH 12X80 14x80 12x80 10x80 8x80 6x80 <br />200 0.99 1.12 1.50 1.89 2.23 2.68 <br />300 1.44 1.64 1.92 2.20 2.55 3.00 <br />350 1.67 1.80 2.04 2.32 2.67 3.12 <br />400 1.89 1.90 2.14 2.43 2.77 3.22 <br />450 1.89 2.00 2.23 2.52 2.86 3.31 <br />500 1.97 2.08 2.32 2.60 2.95 3.39 <br />600 2.11 2.22 2.46 2.74 3.09 3.53 <br />700 2.23 2.34 2.58 2.86 3.21 3.65 <br />800 2.33 2.44 2.68 2.96 3.31 3.76 <br />900 2.43 2.53 2.77 3.06 3.40 3.85 <br /> <br />