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<br />Exn~brt 60C <br />Subsidence Eveluabon and 2004 Geologic Hazard Fietd Observatwns <br />West Flatiron Lease Area <br />Figure 5. Westward vlew of the cliffs and ledges of the Ohio Creek Member of the Mesaverde FormaGOn <br />snowing a rockfall and landslide area la„ated m the southwestern part of the West Flatiron Lease area <br />From Location 3. A small landslide ~s located m the lower center of the image. <br />• I he natural rockfall process im~olves failure along joints near the edge of the clifTs, tshich <br />tend to open up in reslwnse to the lateral component of graviq-induced stress. the roek~ <br />then topple, full, and roll down slope. <br /> <br />A rockfall and landslide area is located on the eastern side of 1Ncst flatiron alxivc the <br />southeastern part of un-mined lontzHall panel 21 (Figure 5). The fall and slide arcs is located <br />tcithin a few hundn;d feet tsest of the tte;t boundun of the West Flatiron Lease area (in the <br />Buy C'ant'on mining arcs), but is tt ithin the area i+f mining influence of the lease. <br />In wmmarv, the natural rockfall potential to date has been observed to incrcasc only acn <br />slit:hth or not at all in areas ~~-here the natural meklall )xncntial is high, hotveecr the rockfall <br />Ex>tential tsar accelerated noticeably above longN~all panel 22 where the estimated natural <br />rocklall potential is very high. <br />831-032 650 Wnght Water Engineers, Inc Page 22 <br />November 2004 <br />