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5 <br />W <br />Z 4 <br />Q <br />3 <br />U) <br />Q 2 <br />Z <br />O E 1 <br />W O 0 <br />= cn <br />Z W -1 <br />Q <br />E Z -2 <br />J -3 <br />2 -4 <br />-5 <br />Mm <br />~ O <br />"*"South of Divide <br />/ oo <br />- / o Em <br />a <br />-t South of Divide <br />0 <br />0 <br />a o 0.2 0.4 o.s o.s <br />5 wid <br />1.0 1.2 1.4 1.6 <br />Figure D. Graph showing maximum tilt (Mm) and horizontal strain (Em) 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 />ZA\Project Files \72 -99 \831- 032 \831- 032.780\Delrverables \SPRING 2007 REPORT\Appendjt A.doc <br />