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. _ Exhibit 6GC <br />Subsidence Evaluation and 2004 Geologic Hazard Fieid Observatans <br />West Flac•ron Lease Area <br />. _ • The image shown in Figure ? is within the area of mining influence of tin-mined longw:tll <br />~- ptutrls ?(1 and 21 in the eastern part of the 13ox Canyon mining area, as well as in the area of <br />- influence of these longs+all panels that c~tend into the Nest Flatiron Lease area. <br /> <br />• <br />Overburden depth ro the li Scam is abaut'_.I i0 leeL <br />8.2 Location 2 <br />L.ocatiun ? is about 4t7U t'ect west ol'the West Flatiron boundan at the cliff'outcrop of the (7hio <br />Creek ~9cmber of the \1rsa~erde Formation abu~r the eastern part of tin-mined kmgwall panel <br />.0. <br />A good view ol'thc rugged clitl's and lower slopes of West Flatiron is shown in Figure 4. 1hr <br />area shown near the IrR margin of Figure 4 is within the area of mining influence of un- <br />minrd lungwall panels IR and 19 for both the E3ox Can}tm mining area and the N'cst Flatiron <br />I_case area. <br />Figure 4. Northward view of the West Flatiron Lease area from Location 2 The left side of the image ~s <br />the approximate boundary between the Box Canyon mining area and the West Flatiron Lease area. The <br />natural rockfall potential is locally high to very high for the first 200 to 300 feet of cliffs and over-steepened <br />slopes below <br />83t-032 650 Wright Water Engineers. Inc Page 20 <br />November 2004 <br />