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Parameter <br />Longitudinal Profile <br />So. End 1 NW LW <br />Longitudinal Profile <br />No. End 1 NW LW <br />Transverse Profile <br />Above 2,3 NW LW <br />W/d <br />750/1240 =0.6 <br />750/1350 =0.56 <br />2 NW: 750/1000 =0.75 <br />3 NW: 750/900 =0.83 <br />a S <br />N/A <br />N/A <br />0.20 to 0.35 <br />a =S /t <br />6.94/12 =0.58 <br />6.06/11.5 =0.53 <br />2 NW: 0.62 <br />3 NW: 0.58 <br />S /d <br />0.005597 <br />0.004489 <br />2 NW: 0.00729 <br />3 NW: 0.00762 <br />S /d <br />0.000004514 <br />0.000003325 <br />2 NW: 0.00000729 <br />3 NW: 0.00000847 <br />M <br />0.015 <br />0.014 <br />2 NW: 0.014 <br />(2.7•S /d) <br />(3.1 . Sm /d) <br />3 NW: 0.021 <br />C <br />0.000065 <br />(14.4•S /d) <br />0.000060 <br />(18.0•S /d) <br />2 NW: 0.00022 <br />3 NW: 0.00014 <br />- 0.000111 <br />- 0.000066 <br />2 NW: - 0.00025 <br />(- 24.6•S <br />(- 19.9•S <br />3 NW: - 0.00012 <br />E <br />0.0070 <br />0.0058 <br />2 NW: 0.0102 <br />(1.25•S /d) <br />(1.3•S /d) <br />3 NW: 0.0085 <br />- 0.0047 <br />- 0.0009 <br />2 NW: - 0.0236 <br />(- 0.8•S /d) <br />(- 0.2•S /d) <br />3 NW: - 0.0307 <br />Maximum <br />80 feet <br />100 feet <br />50 feet <br />Crack Depth <br />Break Angle <br />32percent <br />42percent Slope - <br />- <br />Slope - <br />3° <br />Slope in opposite <br />-9° Slope in same <br />Direction to tilt <br />Direction as tilt <br />Angle of <br />17 °(4) <br />15 °(4) <br />- <br />Draw <br />• <br />• <br />• <br />TABLE 1 <br />MAXIMUM SUBSIDENCE PARAMETERS <br />FROM WEST ELK MINE SUBSIDENCE MONITORING NETWORK <br />Notes: <br />(1) Numerical curvature values are in radians per foot (rad/ft). <br />(2) Maximum crack depth is projected for hard, brittle sandstones; depth is expected to be much less, or non- existent, in <br />soft, ductile shales and claystones. <br />(3) Measurement from vertical reference. <br />(4) Measurement takes into account influence of development entries, chain pillars, and prior F -Seam mining. <br />