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C <br />C~ <br />0 <br />0.2 <br />®.~ <br />~~~ m <br />0.6 <br />0.6 <br />~.~ <br />-i.0 -0.6 -0.6 -0.4 -0.2 <br /> <br />~/~. <br />Figure 9. Subsidence development curves relative to a point (P} from the SNW longwall panel <br />at the West Elk Mine (squares), and Somerset room-and-pillar (circles, subsidence more than 90 <br />percent complete and triangles, subsidence only 60 percent complete) as compared to the <br />average National Coal Board curve (1975). This relationship is shown as the ratio of subsidence <br />to maximum subsidence (S/Sm) versus the ratio of face position to overburden depth (X/d). <br /> <br />0 0.2 0.~ 0.6 0.1~ 1.0 -.2 fl.~ <br />