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• <br />• <br />E <br />w <br />Z <br />F- <br />J <br />Z <br />O 1 <br />E2 O 0 <br />= (!) <br />z -1 <br />Q <br />� <br />z -2 <br />J -3 <br />I- <br />2 -4 <br />2 <br />X -5 <br />2 <br />> South of Divide <br />+ Em <br />Z:\Project Files \72 -99\ 831 - 032 \831- 032.780 \Deliverables \SPRING 2007 REPORT\Appendix A.doc <br />South of Divide <br />E <br />0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1 6 <br />W/d <br />Figure D. Graph showing maximum tilt (M and horizontal strain (E versus the mining panel <br />width to depth ratio (W /d). Tilt (circles) and horizontal strain (squares) for the West Elk Mine <br />subsidence monitoring network are shown with the average National Coal Board (1975) longwall <br />curves. New curves are shown as developed for the South of Divide mining area. <br />