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70 <br /> so <br /> <br /> ~`'~ <br /> <br />...~ <br />c <br /> 40 <br />~ <br />0 Subsidences°lo}=+8.4f 9+f 1.951n f-max~~fw-} <br />~; 30 rz=0.949 Syx=4.77% <br />:~? `.max = 4.$8x10-~ <br />Y <br />R <br /> ~0 _ <br />1 <br />Y = ©ensity ~PCF} <br /> R =Extraction Ratia <br /> H =Mining hleight eft) <br /> 10 W =Pillar Width (ft) <br /> <br /> °w ~a ~o so ~a 100 <br /> ~-mcnc~H <br /> Red Cliff Mine EIS <br /> Figure 8 <br /> Subsidence Over Room-and-Pillar <br /> Workings after Pillar Failure <br />DBMS 344 <br />