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Elk Creek Mine Subsidence Page 22 February 26, 2003 <br />Figure 7. Chimney collapse height cumulative frequency <br />distribution (data from Gray, et. al., 1977). <br />100 <br />90 <br />80 <br />W <br />70 <br />W <br />~ 60 <br />Z <br />W <br />1Y ~ <br />W <br />Q <br />aj 40 <br />J <br />~ 30 <br />v <br />Zo <br />10 <br />0 <br />0 50 100 150 <br />HEIGHT OF CHIMNEY COLLAPSE (feet) <br />-22- <br />200 <br />• <br />L <br />~~ <br />Cumulative percent of chimney collapse height <br />(Gray, Bruhn and Turka, 1977) <br />