2008-03-03_PERMIT FILE - C2006085A (2)

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The air intake side of the partitioned slope will be equipped with rail for • transportation of men, materials, and supplies. The rail will extend from the surface opening into the yard where cars can be positioned for loading .and unloading of personnel, supplies, and equipment. The decline portal will be designed, constructed, and maintained to provide stable long-term access for the life of the Northfield mining operations. Portal maintenance, including both openings in the partitioned ;slope, will involve periodic inspections, adjustment or replacement of roof control devices, drainage of any water inflows, and belt and track maintenance to maintain safe and dependable transportation and coal haulage. Upon completion of mining activities, Northfield will seal the mine portal to prevent access. Sealing will require either fabrication of a block or concrete wall, or filling of the opening with compacted incombustible material for distance of at least 25 feet, in accordance with 30 CFR. 75.1711. The void between the portal seal and the surface will be back~Filled with compacted construction debris and overburden -----mater-ia~: -Se~al~ing and-rec-la-mation-of--mine-openings-is- discussed further in SE~ction 2.05.4. • Hoist Systern and Protective Structure A hoist system will be designed and installed to safely transport men, equipment, and supplies in and out of the decline entry. The hoist will be a double drum unit equipped with required overspeed, overwind, and automaitic stop controls, constructed and maintained in accordance with CFR 30, 75.1400. Power for the hoist will be provided by an electric motor, and a backup motor will be provided for continued operation in the event of failure of the primary system. The hoist system will be placed in line with the decline within a prefabricated steel structure to protect the equipment from precipitation and dust, and to provide security for the installed equipment. NVithin the structure with the hoist equipment will be an enclosure foir the full-time hoist operator, along with associated electrical distribution and protection equipment. The supporting concrete pacl will be anchored to bedrock in order to provide the required support and stability for the hoist. General construction and dimensional information for the structure is shown on Table 2.05.3-2. Upon complE~tion of mining and just prior to sealing the portal, the hoist and associated mechanical equipment will be salvaged, the housing and foundation will be demolished, and resulting debris will be disposed of iin designated disposal areas on site. 2.05.3-12 Revised 5/01/07