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2005 Subsidence and Gaolog,c Field ObsorvaUOns <br />Box Canyon, Wost Flatiron, Apache Rocks, <br />and South of Divide 64n,ng Areas <br />(Figure 6). :Vthough the mining of longwall panel 2'_ likely triggered the rockfalls and slides <br />shown in Figure G, they were prohahly near a potential failure stage. Ruc:kfalls are common in <br />the rlifl areas of \\'eit Flatiron. <br />Figure 6. Southward view of a recent rocklalUlandshtle, caused by tailure m a massive sandstone cldl of <br />the Ohio Creek Member of the Mesaverde Formation. The tailure occurred some 1,800 feet above the <br />ta,lgate road pillars of mined longwall panel 22. The excavated area above the slide (upper nghq is <br />MDW 22.05. Two small, Iresh rocklall areas can be seen in the same sandstone to the left. <br />4.4.2 Location 6 <br />[.ctcattOrt G, which is the same point as IAl'ahOn 2 of the 20(k3 field traverses, is I~k•ared in flit <br />approximate center of mined longwall panel 22 in approximately 2.350 Icct of uverhurdcn to the <br />Q Scam. GPS IlxahOn is 290,2Sthttl:. 4,309, I C>am\ I lrl'A1, NAD 193:x, circle of en•or: G-9m). <br />Cracks were not observed in Traveru C-C' on flit drill read. un the walk to this obsenation <br />point, ur to the end of the traverse. No changes +vcm uhscrvcd on the nxktall and landslide area. <br />located un the cast side of &tx C;tnyun atxtvc un-mined longwall panel 19. The potential for <br />more movement in this unsWhle area, which is Ic>lated alwve un-mined longwall panel 19, ranges <br />a3t •032.710 W right Water Engutoers, Inc. Page t6 <br />November 2005 <br />