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When drilling is required near the crest of a highwall, it may be necessary to orient the <br />drills at the crests of highwalls at an angle less than perpendicular to the highwall. <br />Protective measures will be utilized to ensure the safety of personnel and equipment. <br />These measures will include establishing berms at the crests of the highwalls prior to <br />commencing work to ensure safe distances from the crest are maintained for equipment <br />working in this vicinity, orienting equipment as near to, but not perpendicular to the <br />highwall as possible given the constraints of the cross -slope stability limitations for the <br />equipment involved, and/or utilizing buffer blasting in advance where possible to <br />eliminate the need for drills to work near the crest of an established highwall altogether. <br />Benching may be necessary in order to allow the drills to work safely. Benching is <br />accomplished by means of excavation, importation of fill material, or a cut/fill process. <br />Protective berms will be established on the benches and safe access to the benches <br />will be established and maintained. <br />Underground Mines: <br />There is currently an abandoned Highwall mined area north of Lancaster Pit. However, <br />there will be no highwalls developed directly above this area (see Ground Control Map <br />1) <br />Coal Removal: <br />Coal is generally excavated with hydraulic excavators positioned on top of the coal <br />seam. Trucks are usually loaded while sitting on the pit floor. However, before an initial <br />slot is opened up in any given area, trucks are loaded while sitting on the coal seam. <br />Coal may be excavated and hauled by other equipment from time to time. <br />Access to the pit floor will be provided via ramps on either the highwall or spoil side. In <br />some cases, access may be through the end wall of the pit. Typically, these access <br />roads will be constructed with an average grade of up to 12%, with some steeper <br />sections. Berm height will be, at a minimum, the axle height of the largest piece of <br />equipment utilizing the access road, or any elevated roadway. The running surface will <br />be a minimum of 1.5 times the width of the largest piece of equipment utilizing the <br />access road. Adequate drainage will be provided along the access road. <br />Blasting: <br />Both non -electric and electronic blasting systems are used at Trapper. The non -electric <br />system is initiated manually with a lead-in line and an electric blasting cap or <br />radio/remote firing device. The electronic system is initiated through a lead-in line and <br />computerized firing control box. The blasting systems used at Trapper may change at <br />any time if a better, more economic or safer blasting system is developed. Persons who <br />use or handle explosives or detonators will be experienced employees who understand <br />the hazards involved. Trainees will do such work onlAGeg�,Tlho /ftivision of <br />experienced employees. ED <br />AUG 2 6 2016 <br />S:\GROUND CONTROLUanuary 2016 GCP Revision\Trapper_GCP Jan20 X U&Ma..b&TR I CT 9 Page J 6 <br />