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2008-03-21_PERMIT FILE - C1980007A (5)
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2008-03-21_PERMIT FILE - C1980007A (5)
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Last modified
8/24/2016 3:25:41 PM
Creation date
6/20/2008 11:15:04 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007A
IBM Index Class Name
Permit File
Doc Date
3/21/2008
Doc Name
pg 2.05-101 to 2.05-199
Section_Exhibit Name
2.05.5 & 2.05.6 Post-Mining Land Uses and Mitigation of Surface Coal Mining Operation Impacts
Media Type
D
Archive
Yes
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West Elk Mine <br />Modern Methods-of Ventilation <br />Under modern methods of ventilation, high capacity fans exhaust return air from the mine. This <br />procedure keeps the mine air pressure less than the outside air pressure. The mine is less likely to <br />"gas up" because methane is continually removed from fractures in this negative-pressure <br />environment. In the case of the Oliver No. 2 Mine, fresh air reportedly was blown into the mine <br />with a 4-foot squirrel-cage blower (Boyd Emmons, Oral Communication, November 6, 1996). In <br />this type of positive-pressure environment, the mine workings become progressively gassy if the fan <br />does not have-a sufficient air-moving capacity to ventilate sudden inflows of methane. <br />Potential Impacts of Subsidence and Mine Induced Seismic Activity on Landslides and <br />Rockfalls <br />Landslides <br />Box Canyon Mining Area - In October 1996, large, composite landslides with numerous scarps <br />were observed between the unnamed drainage west of Box Canyon and Box Canyon and also to the <br />east of Box Canyon. As discussed in Section 2.04.6, the slides are compartmented into essentially <br />separate slides by competent sandstone ledges. Grabens, sag ponds (complete with small wetlands), <br />and tension cracks occur between the scarps. The tension cracks could easily be confused with <br />subsidence cracks, but no mining has been done in the area. The landslides are located in or near <br />the northern boundary of the Box Canyon permit revision area. The southern limit of the landslides <br />is located at least 650 feet north of the nearest planned longwall panel-well outside of the <br />conservative angle of draw. <br />In October 1996, large, composite landslides with numerous scarps were observed between the <br />unnamed drainage west of Box Canyon and Box Canyon and also to the east of Box Canyon. As <br />discussed in Section 2.04.6, the slides are compartmented into essentially separate slides by <br />competent sandstone ledges. Grabens, sag ponds (complete with small wetlands), and tension <br />cracks occur between the scarps. The tension cracks could easily be confused with subsidence <br />cracks, but no Honing has been done in the area. The landslides are. located in or near the northern <br />boundary of the Box Carryon permit revision area. The southern limit of the landslides is located at <br />least 650 feet north of the nearest planned longwall panel-well outside of the conservative angle of <br />draw. <br />As mentioned above, a small portion of the development mining area along the northwest side <br />longwall panel 18A underlies a known area of landslide disturbance south of Highway 133 as <br />shown on Map 1 of Exhibit 60C. is a result, the worst possible consequence associated with <br />minim-induced . subsidence in the West Flatiron lease area is that this landslide will be <br />reactivated during mining activities causing a potential crossing of Highway 133 and an <br />obst_ ,.ction to traffic. <br />Based on observations made in the field bot.1-1 of active and inactive landslide areas before and <br />after mining activities, MCC and it's consultant (WWE) concludes that the greatest potential for <br />the worst possible consequence would occur during a very wet precipitation period. Such <br />periods have been observed in the North Fork Valley as recently as the mid-1990s causing <br />initiation or reactivation of numerous natural landslides. <br />2.05-144 Revised June 2005PRIO, Rev. A4arch 2006; May _ 006 PRIO. Nov. 2006TR707,Ap7-i! 2007TRI08; Sep. 2007 PR12; Feb. 2008 PR-12
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