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Fall 2007 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />l'hc overburden depth to the E-seam in the shaft excavation area is approximately =t•O0 feet. The <br />depth of the colluvium and local landslide material is estimated to be in the range of 75 to 12~ <br />feet. <br />Projected long~vall panels EI through Eli underlie the Dty Fork valley and its tributaries <br />upstream from the mouth of Deer Creek to the SOD mining permit boundary (figure 27). <br />Although as much as 14 feet of coal is projected to be mined in the E-seam. subsidence effects <br />are expected to be less than in the Box Canyon and Apache Rocks mining areas because the <br />topography is more subdued and fewer cliff areas are present (see Table 2, Appendix A, t~~r <br />details). <br />~• ~ e4.. <br />`~ ,• <br />`' ~ -.« <br />S ' {o .. <br />'d ~ ~~; . <br />~' ~ { ' <br />w. - !; <br />_ :~' <br /> <br />~ r -+r7~ ~~.~~ f 'y ~ rat - { ~.~ r- ._' `4~rj ~ ~ ~~ <br />• ~ ~.a •, ~~~ <br />Vic.; L ~ ~'. ~ ~ ~ ~K « fir' ~~j~~~'~"~4;~,, ~ f `r <br />Ski, ~R; s~: ~~~~~r+ ~R':~'^.i4•.~ - _`~ ~, .~-.. ~.'-l,''~ c, <br />. .,~, ~~~ ,;r'w4,, <br />' a ~ ~ , <br />r ~ '~. <br />t j~~ s~ - <br />r f ' <br />Figure 27. Southeastward view of Dry Fork valley and its tributaries showing the topography that overlies more than <br />fifty percent of the SOD (SOD) mining area. Mount Gunnison is in the right background; West Beckwith Peak is in <br />the Iefi background. Overburden depth to the E-seam in this field of view ranges from about 600 to 1,200 feet. <br />• <br />831-032.780 Wright Water Engineers, Inc. Page 41 <br />November 2007 <br />