2010-05-07_PERMIT FILE - C2006085 (2)

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will be backfilled with compacted construction debris and overburden material. Sealing and reclamation of mine openings is discussed further in Section 2.05.4. Ventilation Shafts, Mine Fan and Fan Housing, and Emergency Escape Hoist Two proposed ventilation shafts will be constructed during the initial development of the mine. Both shafts will be circular, approximately 10 feet in diameter, and are anticipated to range in depth from 300 to 340 feet. Shaft walls will be lined, where necessary, to stabilize weak strata or control water inflows. Areas will be excavated at each shaft site to create cut /fill benches to accommodate the shaft drilling equipment and for subsequent use during mining operations. Bench size will be limited in size for the intended use and protection of each shaft opening. At the exhausting shaft, the site will contain the shaft opening and its concrete collar, and space for vehicular access. The opening will be covered with a reenforced steel grid to prevent ingress. The bench for the mine fan shaft will be large enough to contain the fan and housing structure along with the adjacent emergency hoist system. Both bench areas will be graded to drain stormwater away from the openings. Perimeter fences will be constructed to maintain security. At the collar of the intake shaft, fan housing and air duct structure will be constructed between the fan and shaft to enclose the axial fan and cable- operated emergency escape pod. The fan motor and associated electrical equipment will be mounted outside the fan housing. A small vertical extension of the fan housing, located directly above the shaft, will provide an airtight enclosure for the escape pod. The pod enclosure will have a set of airlock doors for personnel access, with a stairway constructed from ground level to the doors. The escape pod will be operated by a small electric - powered hoist and fixed crane boom mounted on the ground near the shaft. The boom will extend over the top of the escape pod enclosure, with its end - mounted pulley centered above the shaft for hoisting the pod. All of the fan components, fan housing, air duct assembly, and pod enclosure structure will be constructed from prefabricated steel panels, and will be anchored to a concrete pad designed to support the load of the structure. The anticipated ventilation demands to control coal dust, equipment emissions, and methane from face areas will provided by a fan in a 2.05.3 -12 Revised 12/04/09, TR -01