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?1 <br />r? <br />E <br />5 <br />4 <br />3 <br />2 <br />1 <br />?e 0 <br />-1 <br />-2 <br />3 <br />-4 <br />-5 <br />1Vdm <br />4000- <br />South of Divide <br />? f. <br />0 <br />a <br />?M <br />' South of Divide <br />0 <br />0 <br />0 0.2 0.4 0.6 0.8 <br />W/d <br />1.0 12 1.4 1.6 <br />Figure 5. Graph showing maximum tilt (MO 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) <br />longwall curves. New curves were developed for the South of Divide mining area. <br />Tetra Tech - 090717/P <br />45