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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />• <br />yY <br />1 <br />r ?t <br />Figure 5. Northeastward view of a new rockfall/landslide on the east side of Sylvester Gulch above <br />currently mined Longwall Panel 25. Notice the light color of the fresh rock outcrop which is the <br />source area for the rockfall/landslide. Compare this to the small rockfall area in the left-central <br />portion of the image which suggests that this rockfall is considerably older than previously <br />discussed in the Spring 2008 Subsidence Monitoring Report. <br />• <br />i ' TC ?.•x't? ?? " <br />Figure 6. Eastward view of the new rockfall/landslide on the east side of Sylvester Gulch. Much of <br />the rockfall was captured by the upper drill road. The large boulder among the established <br />vegetation demonstrates that it has been there for many years and that this is a natural occurrence <br />in this area. <br />• <br />December 2008 <br />Wright Water Engineers, Inc. Page 19