2014-04-25_PERMIT FILE - C1982056A (3)

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Ventilation System ,The main mine ventilation system consists of two fans. The two fans are a Buffalo Forge, Model 28-16, and a Jeffrey, Model 8HUA96. They are located as shown on Map 24, Surface Facilities. The bleeder ventilation system was first developed with the Fish Creek Ventilation Borehole. The system then utilized the Southwest Ventilation Borehole until the completion of the Western Mining District. The Eastern Mining District utilizes the EMD Ventilation Shafts for both bleeder exhaust and bleeder intake. These ventilation systems are described in detail below. For the development of the EMD, the number 7 North Escape Shaft was installed for emergency evacuation purposes and is currently utilized as a supplemental intake airsource. A heating system has been installed at the portal entry. The system will circulate antifreeze through the houghs on either side of the slope. This will prevent water from freezing on the slope which, in turn, will alleviate ice buildup. Buffalo Forge The Buffalo Forge is a 110" diameter vane axial fan that has the capacity to exhaust approximately 700,000 cubic feet per minute from [he mine. The prime mover is a 1,250 hp motor. The Buffalo Forge fan is tied into the existing structure of the rock slope bulkhead via duct work. The fan is tied into this duct work and the motor is offset from this system. The fan, motor, and duct work are supported on concrete footers and pads which underlie al! the structures. The electrical building, housing the motor and • controller, is on a 30' x 30' by 2' pad requiring approximately 67 yards of concrete. The motor is on a concrete pedestal 5' x 4' x 4' and contains approximately 3 yards of concrete. The fan is mounted on a concrete pad 15' x 30' x 2' with a pedestal 2' x 8' x 5' totalling approximately 33 yards. The outlet evase is connected to the fan via a 90 degree transition duct with both being supported on the same concrete pad as the fan. 0 E°try Ventilation Shaft A ventilation shafr was constructed into the 0 entry, and is approximately 100 feet deep with a finished inside diameter of 16 feet. A fan and control building was placed adjacent to the shaft. The location of the shafr, fan and building is shown on Map 24. The fan is a Jeffrey, Model 8HUA96, which is a 96" diameter vane axial fan that has the capacity to exhaust approximately 900,000 cubic feet per minute from the mine. The prime mover is a 1,000 hp motor. Prior to constructing the shafr a pad azea was developed by excavating approximately 16,000 CY of material from the site. Of this amount there is a limited amount of plant growth media which was placed on the topsoil stockpile adjacent to the site. It was estimated that less than SO CY of plant growth material is at the site. The presence of vegetation dictated if the material was salvaged and placed on the topsoil stockpile. The excavated material was placed in the adjacent equipment storage azea and was utilized in the grading associated with the proposed preparation plant facility. The final grade of the slopes is between 2H:1V and 3H:1 V. The existing road into the equipment storage area is used to access the site. The shaft was constructed by drilling a pilot hole into the mine and then reaming it out to a diameter of 48 inches. The initial drilling required installation of mud pits. The area is located within Twentymile Coal Company's . existing sediment control system. After the pilot hole was bored the cuttings from the reaming process fell into the mine entry and were hauled away by the underground mobile equipment. The cuttings were placed underground. !+ ~APPROVEU APRs u 1998 PR 97-04 2.05-39 04/15/98