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Ventilation - InFluences the size and number of mine openings. • The general mine plan layout and timetable is shown on Map 23. Main entries consist of parallel openings, typically 5, but may he increased or decreased in number depending upon conditions, driven on 80-foot centers. The openings will be approximately 20 feet wide and separated by GO-foot pillars. Crosscuts will be driven to connect the mains every 100 feet. Longwall panels will be laid out in 500 to 800 foot wide by 3,000 to 9,000-foot long blocks. The blocks will be bordered by a 2 or 3-entry system of gate roads. Atypical mine section layout is shown on Figure 7, Typical Mine Section. Map 23, Mine Plan, represents a general conception of the anticipated artery system. Exact location of mains, as is understood, is subject to change as development progresses and mining conditions are proved or the land or permitting status changes. In the event conditions prove to be such as to preclude longwall mining as a feasible and practical mining method, TCC would utilize continuous mining methods in a manner to achieve the best recovery possible under the circumstances. Attempts are made, wherever possible, to maximize [he reserves designated for extraction by the longwall method. In order to further define the geologic conditions in panel 5, a mine development drill hole will be drilled during 1990. The location of the drill hole is shown on Map 23A, Mine Plan. An existing ranch road will be used as part of [he access into the site. The existing ranch road, as shown on Map 23A, will tie inro the access road leading into the site. The proposed drill site location has been shown on Map 23A inside of the boundaries of the drilling area. It is anticipated the drill site will be located a[ that location, although it may be • located anywhere within the drilling area boundary. The exact location will depend upon field conditions and survey control. In reference to the new access road into the site, it is planned not to strip topsoil unless ground conditions dictate this be done. If excessive rutting will occur [hen the topsoil, approximately 2 feet in depth, will be bladed to either side of the road. Once the site is reclaimed the topsoil will be bladed back over the road and seeded wi[It the appropriate seed mixture. The drill site will be approximately 100 X 100 `and will have [he topsoil stripped from it. The ropsoil will be srockpiled adjacent to the site and signed. Once the site is reclaimed [he topsoil will be redistributed over [he site and seeded with [lie appropriate seed mixture. A ditch will be inscribed above the drill pad and will divert upland Flow away from the pad. If the topsoil stockpile is located upslope of the pad the diversion ditch will be inscribed above the stockpile. The ditch will minimize [he amount of precipitation that falls on the pad, and [he ditch and the small size of the pad will provide sediment control for the site. After topsail has been salvaged from the site, the site will be leveled as necessary, and mud pits will be dug within [he boundary of the site. The material excavated from the pits will be placed adjacent to [he pi[ within the boundary of the site. After drilling ceases the pits, once suitably dry, will be backfilled with the material excavated from them. A trash pi[ may be dug on the site, or an existing mud pit may be used to collect trash, such as paper, cans, cardboard, etc. It is understood that oily wastes will not be placed in the pit. The trash pit will be backtilled when it is no longer needed. • The drill hole will be approximately 1,200 feet in depth and have a nominal diameter of 6'/ inches. The hole will be drilled with either, air, water, foam or mist, or any combination of the various circulation media. Any water arising MR 97-154 2.05-14 Revised 9/9/97