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<br /> <br /> <br /> <br /> <br />South of Divide <br />South of Divide <br />South of Divide <br />South of Divide <br /> <br /> <br /> <br /> <br />Figure 5. 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 were developed for the South of Divide and Dry Fork mining areas.