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E <br />w <br />z 4 <br />1— <br />Q 2 <br />F- <br />Z <br />O 1 <br />O 0 <br />LL <br />0 <br />_ u) <br />Z - 1 <br />Q <br />E Z -2 <br />1- -3 <br />1- <br />2 -4 <br />- 5 <br />i <br />1, <br />_ r <br />r <br />L <br />I <br />A <br />" South of Divide <br />E <br />South of Divide <br />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 />Z:\Project Files \72 -99 \831- 032 \831- 032.780\Deliverables \SPRING 2007 REPORT'Appendix A.doc <br />+Em <br />