2012-05-11_PERMIT FILE - C1981033 (3)

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• 2.05.6(6) Structures and Renewable Resource Lands The following Table 15 presents a list of structures and renewable resource lands within the permit and adjacent area. Table 16 presents the magnitude of damaging effects of horizontal movements caused by subsidence. The West Elk Mine structures are presented on Map 6. Severe subsidence coupled with large horizontal movements, if it occurred, could render many of West Elk's structures useless and require partial or complete rebuilding. The same is true for the Operators surface facilities, railroad, State Highway 133, structures in the Town of Somerset, Somerset Mining Company surface facilities and the Fire Mountain Canal. Subsidence could effect the springs and water rights in the adjacent area. Subsidence could also temporarily affect the North Fork of the Gunnison River. Since the description of worst possible subsidence consequences determined that material damage or diminution of reasonably foreseeable use could result in the event of subsidence within the • permit and adjacent areas, then a subsidence control plan is necessary. 0 The subsidence control plan is to restrict mining to areas where the anticipated extent of subsidence is well away from any of the structures or renewable resource lands presented on Table 15. Map 6 presents the projected extent of subsidence, from the B -Seam mining, and the nearby structures and renewable resource lands. It is clear from this map that the structures and renewable resource lands lie outside of the projected extent of subsidence. The projected extent of subsidence is developed from published data (C. Richard Dunrud Geological Survey Professional Paper 969), the lithologic information presented on Map 7, the overburden information presented on Map 14 -10, and a room and pillar mining technique. Based on this information a 25° angle of draw was used to develop the projected extent of subsidence. 2.05 -63d Rev. 12 -29 -94