Laserfiche WebLink
<br />• <br />3.1.4.2 Hiohwall Minino <br />Highwall mining is slated to occur to the east of East Ashmore pit and the Gatling dip pit in 2006 and <br />2007. In East Ashmore pit the H seam on the floor of the last cut will be highwall mined prior to <br />backfilling and regrading. In Gatling dip pit both the K and Q seams will be highwall minetl. The two <br />seams may be mined top-down or bottom-up depending on geotechnical considerations and the <br />sequence of stripping and mining operations. <br />In addition, highwall mining may be conducted in the end walls of the East Ashmore, Gatling, Derringer <br />and Flintlock pits if further geologic and geotechnical studies demonstrate feasibility, and the timing of <br />stripping operations allows access. In the East Ashmore pit end wall the H seam would be mined. In the <br />'n di pit end wall the K andLor_the_M.and/or the Q seam would be mined. In the Demnger pit end <br />wall the fl seam would be mined. In the Flintlock pit end wall the Mand/or the O seam would be mined. <br />Use of Mining Technologies' HW H800 Addcar System is plannetl. A launch vehicle platform, which sits <br />on the floor of a conventionally mined cut, controls all functions of the system, rigid conveyor cars, which <br />are each fitted with their own belt conveyor, are fed by a full sized conventional, remote controlled <br />underground continuous miner. Video cameras placed on the miner give real time feedback to the <br />outside operator, a proprietary HORTA Guidance System gives continuous three dimensional locations, <br />and Gamma Sensors in the miner's cutting head provide the ability to sense roof and floor rock and help <br />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 condkions; 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 alive untlerground mine workings in any of the <br />pertinent coal seams in the proposed highwall mining areas. In the event abandoned or alive <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 overtying 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 toxio-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 forth awater-tight seal or the discharge will be treated <br />within 72 hours after completion to meet applicable effluent limitations and water quality standards. <br />---'-'_'-- _'/~-~Ir '~~°o/o~ <br />3-15b <br />~~ ~"--~ ~_~~IS~a~~ <br />