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7 <br />~~ <br />^ ^ D <br />D ^ ^ <br />COLORADO WESTMORELAND INC. <br />ORCHARD VALLEY WEST MINE <br />ORCHARD VALLEY MINE <br />ROOF BOLTING PATTERN <br />~ <br />~ <br />1 MAX <br />MAX <br />MAX <br />S~MAX. WHERE PILLAR CORNERS NAVE <br />U ^ ^ <br />U ^ SLOUGHED OFF EXCESSIVELY, <br /> MORE THAN FIVE FEET FROM <br /> THE NEAREST SUPPORT, THEY <br /> M'1LL 8E SUPPOPTED WITH <br />0 0 ^ ^ TSIONAL BOLTS OR TIMBER <br />PO <br /> S <br />^ ^ ^ ^ <br /> ~MAX~ . <br /> <br />^ ^ ^ <br />^ x <br />~~ <br /> ^ ^ ~ <br /> <br />^ ^ ^ ^ X N ~ <br /> ~~ W <br /> Q z <br />^ ^ ^ ^ ^ ~~ <br />O O O D x <br />ha <br />^ ^ D ^ ^ ^ O ^ ^ ~~ <br />Initial 11/01/86 <br />^ ^ ^ <br />^ ^ D <br />MDAX, 20 F~ <br />MINED WIDTH <br /> <br /> <br /> <br />