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2004 Geologic Hazard Field Observations <br />South of Divide Mining Area <br /> <br /> <br /> <br />seven general areas with slopes ranging from 30 to 80 percent. The areas listed below (listed in <br />an east-to-west, north-to-south direction) have a low to high rockfall potential (Map 1}: <br />1. There are steep slopes (estimated rockfall potential ranges from moderate to high) located <br />north of Dry Fork and west of Minnesota Reservoir. However, no mining is currently <br />planned in this area, so this rockfall area will not be impacted. <br />2. Two steep ridges with small cliffs and ledges, located above the northern part of longwall <br />panel E9 east of the landslide azea described in section 10.1 (mostly in the SE'/< of Section <br />32, Township 13 South, Range 90 West). The estimated rockfall potential is low to <br />moderate. There aze no roads or man-made structures in the azea. <br />3. The south end of a steep ridge containing cliffs and ledges located north of Minnesota <br />Reservoir and Dry Fork, north of the confluence of Deer Creek and Dry Fork and above the <br />western edge (within the area of mining influence) of longwall panels E1 and E2 (NW'/., <br />Section 33, and S''/Z of Section 29, Township 13 South, Range 90 West). The estimated <br />rockfall potential is moderate to high. However, the Dry Fork road is located 400 to 500 feet <br />south of neazest azea boundary, thus posing no risk to travelers. <br />4. Steep to moderately steep slopes containing seven scattered rockfall areas with small cliffs <br />and ledges located north and south of Dry Fork and its tributaries. Estimated rockfall <br />potential is low to moderate. These areas aze located above longwall panels El through E4. <br />(Sections 33 and 34, Township 13 South, Range 90 West). <br />5. The area is located in the southwest part of the South of Divide mining azea east of the main <br />fork of Minnesota Creek. The northeastern part of this azea, which has an estimated <br />moderate to high rockfall potential, is within the area of mining influence of the western and <br />southern parts of projected longwall panels E8 and E9, respectively (W'/z and S 'h of Section <br />5, Township 14 South, Range 90 West). The road up the main fork of Minnesota Creek is <br />located 1,500 to 2,500 feet from the western rockfall boundary. <br />831-032.621 <br />November 2004 <br />Wright Water Engineers, Inc. <br />Page 44 <br />