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• • <br />POWDERIIORN COAL COMPANY <br />FIGURE 2.05.6 D <br />., i <br />,~ <br />O~6U <br />W <br />sn <br />o; <br />c <br />c <br />40 <br />~~ <br />~ 30 <br />z~ <br />c <br />N <br />H <br />-A 111 <br />J <br />U~ <br />0 <br />~` - 0.949 Sy. - 4. t©% <br />i - R r <br />R - Exrl,~cr:o„ fr -trr„.„.9 N<<~i,r~i~~ <br />zO(~11-3000 -~(~DD SCbO 6A)~DOO BO(Jb 9nno !0000 1%O(lr %2OOn <br />1 n.aw (~/~~) <br />Subsidence above room-and-pillar i,arlial extraction workings following <br />pillar sdueeze or failure. <br />/3000 /JQOJ /.Si <br />InU <br />John F. Abel, Jr. (1902) <br />