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• Ithaca Pit Mining Area <br />There is no mining scheduled for Ithaca pit (I-pit) during the 2008-2012 permit term. This area was <br />originally projected to affect previously disturbed and reclaimed but unmined land. It was to be located on <br />the northern fringes of the old Ashmore pit located in the Coyote and No-Name watersheds. Future <br />development of this area is currently be considered <br />3.1.4.2 Highwall Mining <br />Highwall mining has occurred on a limited basis to the east of East Ashmore pit. In 2007. In East <br />Ashmore pit the H seam on the floor of the cut 45 was highwall mined. <br />In the future, highwall mining may be conducted in the end walls or highwalls of the East Ashmore, L, <br />Derringer, East Flintlock (a.k.a Z) and Flintlock pits if further geologic and geotechnical studies <br />demonstrate feasibility, and the timing of stripping operations allows access. In the East Ashmore pit wall <br />the H seam would be mined. In the L dip pit wall the K and/or the M and/or the Q seam would be mined. <br />In the Derringer pit end wall the Q seam would be mined. In the Flintlock and East Flintlock pit walls the M <br />and/or the Q seam would be mined. <br />Use of Mining Technologies' HW H800 Addcar System or a similar system is planned. A launch vehicle <br />platform, which sits on the floor of a conventionally mined cut, controls all functions of the system, rigid <br />conveyor cars, which are each fitted with their own belt conveyor, are fed by a full sized conventional, <br />remote controlled underground continuous miner. Video cameras placed on the miner give real time <br />feedback to the outside operator, a proprietary HORTA Guidance System gives continuous three <br />dimensional locations, and Gamma Sensors in the miner's cutting head provide the ability to sense roof <br />• and floor rock and help keep the miner in the coal seam and avoid dilution from the roof and floor. <br />Depth of penetration and coal recovery will vary depending on coal seam splitting, thinning or pinching, <br />coal quality, roof and floor integrity, and machine physical limitations. Penetration depths of up to 1,400 <br />feet are possible under optimal conditions; however with Trappers thin and steeply dipping coal seams <br />much shorter penetrations are anticipated. <br />Trapper is not currently aware of any abandoned or active underground mine workings in any of the <br />pertinent coal seams in the proposed highwall mining areas. In the event abandoned or active <br />underground mining operations are identified, no highwall mining will be conducted within 500 feet of <br />previous workings in the applicable seams. <br />Trapper is also not aware of any dwellings, buildings, tanks, impoundments or utilities overlying areas <br />planned for highwall mining. <br />Access to highwall miner entries will be blocked or buried within 30 days following coal extraction. <br />Any highwall mining entry discharging water containing toxic-forming or acid-forming material will be <br />plugged within 72 hours after completion by backfilling and compacting non-combustible and impervious <br />material into the hole to a depth sufficient to form a water-tight seal or the discharge will be treated within <br />72 hours after completion to meet applicable effluent limitations and water quality standards. <br />• <br />Revision: PZ- L, <br />V., /114 3-15b Approved: