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fhc three rooms on the west end of I southwest panel, which show astair-step con Pi~,uratirm, may be driven to aiJ <br />in drainac from the arcs. The microstructure of this area will dictate if these rooms are required to allow drainage <br />of water away from the working area. <br />• The three rooms on the west end of 2 southwest panel may be driven to provide a storage area for the cuttings that <br />will be generated during the drilling of the ventilation borehole. If this storage aria is not required, then these <br />additional rooms will not be driven. <br />A bleeder will be driven on [he west end of 3 southwest panel and a ventilation borehole will be drilled into this <br />entry as shown on Map 23A. It is anticipated that a pilot hole will be drilled fi'om the surface to [he mine, then a <br />raisebore rig will be used to complete [he boring. The details of the ventilation borehole are presented in a <br />following section. <br />The extension of [lie 2 and 3 soutltwes[ panels will allow for an additional 300 feet of loitgwall coal [o be produced <br />from the mine. This is very beneficial in that this coal will be recovered as opposed w beinu left in place and, <br />quite likely, never being mined. <br />Exhibit 7F, Prediction of Southwestern District Foidel Creek Mine, was prepared by SubTerrt, Inc. to predict <br />potential subsidence impacts to the area to be undermined and subsided by the extension of the 2 and 3 southwest <br />panels. The report demonstrates there will be no impact to Fish Creek or its alluvial valley Floor. Tltis feature is <br />the primary renewable resource that could be impacted by the panel extensions. <br />As shown on Map 23A, Twentymile is proposing subsidence monitoring line 5000 to verify that the angle of draw <br />does not project into the Fislt Creek alluvial valley floor. The monuments are labeled 5001 tltrouglt 5006 on the <br />snap. A further discussion of the subsidence monitoring plan is presented in a later section. <br />Twentymile Coal Company is requesting approval to drive the I SW gateroads approximately 700 feet to the west, <br />attd start mining the bleeder entries for 1 S W longrvall panel. The locations of the gateroad, bleeder, and drainage <br />rooms are shown on Figure 16-AI, SW Mining District-Gateroads, Bleeder, and Drainage Rooms. <br />9 Right Gateroads <br />Twentymile Coal Company is requesting approval to drive the 9 Rigltt Gateroads (3) approximately 5,500 feet to <br />the northeast. The locations of the gateroads are shown on Figure 16B, 4 Right Gateroad Extensions. The 9 Rigltt <br />Gateroads will be driven through a BLM right-of--way which Cyprus is securing. It is anticipated the right-of--way <br />will be issued during the first week of May 1945. <br />Driving of the gateroads will not result in any additional surface disturbance. The gateroads are driven by a <br />continuous miner, with each gateroad bay approximately 20 feet wide and 4 feet Itiglt. The coal [Wined from the <br />gateroads will be processed through Twetttymile's existing surface /tipple facility. Watet' used for dust <br />suppression encountered during mining will be discharged through Twen[ymile's existing facilities (either site I I S <br />or 109). The indicated permit boundary has been squared up to make it easier to describe. hmvever, the actual <br />minim, will occur within an area of less than 10 acres. <br />9 & 10 Right Gateroads <br />fwentymile Coal Company is requesting approval to drive the 9 Right Gateroads (3) approximately 7 O00 <br />additional feet to the northeast. The 10 Right Gateroads (3) will be driven approximatcl~ 14.000 leer to the <br />C <br />MR 97-lid "'.Oi-4 Rrvi;cd 11'1597 <br />