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2005 Subsidence and Geologic Field Observations <br />f3ox Canyon, West Flatiron, Apache Pocks, <br />and South of Divide Mining Areas <br />from moderate. in the lower part of the slide, to very high in the u pper f'ructure d and jointed <br />sandstone cliffs and ledges. <br />Fiyure 7. Northward view of a rockfallAandshde area that is located on the east side of Box Canyon above <br />un-mtned Iongwall panel 19. This image shows more of the potential rockfall areas among the clifls and <br />ledges in Its upper part. The potential for more movement in this rocklalllsbde area vanes from moderate. <br />in the lower part (lower left), to very high in the fractured sandstone cliffs and ledges (upper nghq. <br />4.5 Traverse D-D' <br />Traverse is along a drill rood that hegms at ~~iDW' -'3-p5 lalso point C' I and ends at MDLY ?'-5. <br />Soil and culluvium was pnmarily of the Wasatch Formation above un-rttined Iongwall panel 23 <br />and mine) Iongwall panel _'2. Thc overburden depth to the Q-Scam ranges f'rorn '_?IK) u, 2.25(1 <br />feet. No suhsidencc feaatres ~ccrc observed. <br />4.5.1 Location 7 <br />This point is lucutrd m the top of the head scarp u(a rockfall/landslide area with high to eery <br />high nawr:d n>Lktall potential. It is Icxated above the approximate mid point of mined Iongwall <br />panel 22. The overhwden depth to the B-Seam is roughly 2,2W Peel. <br />831-032.710 Wright Water Engineers, Inc. Pege 17 <br />November 2005 <br />