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<br />C <br />• <br />~+ <br />,, <br />„~ <br />,,.~ <br />n / <br />V .5' <br />r': /\ <br />i~,: m(~ <br />V.J <br />n~ <br />u. <br />r-~~ <br />I.0 <br />rn ~r nr n n n n~ n nr i+n i `~ <br />~r~~; <br />iu , w. <br />Figure 8. Subsidence development curves relative to a point (P) from the SNV1' longwall panel <br />at the West Elk Mine (squares), and Somerset room-and-pillaz (circles, subsidence more than 90 <br />percent complete and triangles, subsidence only 60 percent complete) as compazed to the average <br />National Coal Boazd curve (1975). This relationship is shown as the ratio of subsidence to <br />maximum subsidence (S/Sm) versus the ratio of face position to overburden depth (X/d). <br />