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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />f , <br />u <br />11 <br />Figure 7. Another view of the Sylvester Gulch rockfall/landslide looking in an east/northeast <br />direction. Notice the size and number of boulders scattered around and beneath the pine trees <br />located in the middle ground. This slide cut across the upper drill road (middle ground just beyond <br />the pine trees) with some of the more rounded boulders almost reaching the lower road (just <br />beyond the dead pine tree in the middle ground). <br />5.2 Traverse B-B' <br />Traverse 8-13' begins at point X (of 'A-A') along Sylvester Gulch Road at the mouth of the first <br />cast side canyon of Sylvester Gulch and continues southward up the recently completed road to <br />the head of' the galley where it intercepts the main west Flatiron access road above mined <br />Longwall Panel 16 approximately 800 feet west of the area known as Twin Ponds (Ponds P27-2 <br />and P-17-3). <br />Chis traverse is located mostly above portions of the B-seam coal that have not been, and will not <br />he. mined. The traverse, however, is located in the area of nlinin`? influence of various <br />previously-mined longwall panels. Exceptions include a short segment (about 1.500 feet) <br />aarling at B which is above unnlined Longwall Panel 25 and the last segment (about 1.500 feet) <br />• near B'. which is over the Box Canyon mains and western ends of mined Lon?,wall Panels 15 and <br />831-032.790 Wright Water Engineers, Inc. Page 20 <br />December 2008