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PERMFILE114680
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PERMFILE114680
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Entry Properties
Last modified
8/24/2016 10:10:48 PM
Creation date
11/24/2007 11:57:32 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981018A
IBM Index Class Name
Permit File
Doc Date
7/8/2002
Section_Exhibit Name
Section III Mine Description
Media Type
D
Archive
Yes
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<br />III.A.8 Mine Ventilation A permanent fan is installed at the D-Portal ventilation slope. This fan <br />operates in a blowing configuration pushing fresh air into the mine from the Ventilation Entries <br />and through the working area. It operates 24 hours per day, 365 days per year, with the <br />exception of scheduled maintenance periods. MSHA has approved the detailed plans for the <br />ventilation of the underground working. A ventilation shaft was constructed in the B Seam which <br />is an exhausting return air shaft. Details of the shaft construction are given on Map 151. The <br />raised bored shaft is about 210 feet deep and 12-feet in inside diameter. The shaft opening is <br />fenced off and elevated to control unauthorized access to MSHA standards. The shaft site is <br />100'x200'. Alight use road approximately 2410 feet long has been constructed from the existing <br />mine haul road to the shaft site (see Map 151). In anticipation of possible future power <br />requirements for the area, approximately 3400 feet of overhead electric utility lines may be <br />installed. See Map 151. <br />Return shafts RS-1 and RS-2 were constructed to the B-Seam to allow return air to exhaust. <br />RS-1 is about 300 feet deep and RS-2 is about 308 feet deep. Both RS-1 and RS-2 steel lined to <br />a five foot finished diameter. RS-3 will have a finished diameter of six feet when lined with steel <br />and will be about 310 feet deep. The upper and lower 20 feet of the annulus between the steel <br />liner and the shafts are grout sealed in with concrete. The middle zone of the annulus' are gravel <br />filled with weep holes drilled in the liner to allow drainage. Alight duty access road, <br />• approximately 8500 feet long, was constructed to RS-1 and RS-2. RS-3 will require 1550 feet of <br />light use road. A 3-foot diameter, 362-foot deep ventilation shaft was drilled to the West Mains in <br />the D-Seam. Map 153 shows the details of RS-1 which are typical of the other return shafts and <br />roads. Locations are shown on Map 147. <br />During early 1987, gassy conditions were encountered at the Deserado Mine. To relieve those <br />conditions, BME drilled a 12-1/4 inch hole (LWi-1) and six (6) 10-5/8 inch holes (LW1-2 to <br />LW 1-7) into the gob created behind the protective shield of the longwall 1. In September, 1988, a <br />vent hole (LW1-8) was drilled to relieve methane gas in the sealed area of the longwall panel #1 <br />to improve ventilation in other working areas of the mine. In January, 1990, an additional ten (10) <br />10-5/8 inch holes (LW2-1 to LW2-8, LW2-46 and LW2-66) were drilled in the longwall #2 and <br />eleven holes (LW3-1 to LW3-11) were drilled in the longwall #3. Disturbance of the <br />archaeological site 5RB859 was mitigated. Hole LW3-12 in the longwall #3 and holes LW4-1 to <br />LW4-13 in longwall #4 were drilled in 1990. Holes LW4-14 to LW4-17 and LW5-1 to LW5-17 <br />were drilled in 1991. Holes LW5-8 to LW5-15 and LW6-1 to LW6-3 were drilled during 1992. <br />Ventholes LW6-4 to LW6-12 and LW7-3 to LW7-5 were drilled during 1993. Holes LW7-6, LW7- <br />8, LW7-10, LW8-2, LW8-3 and LW8-5 were drilled in 1994. LW7-1 and LW7-2 were permitted <br />but not drilled because of the change in the start line location for LW-7. Holes LW7-7, LW7-9, <br />LW8-1, LW8-4 and LW8-6 were permitted but not drilled. On January 31, 1996, the mine caught <br />fire near LW-9 face. Emergency holes LW9-1 and LW9-2 were drilled to inject COz. The <br />. TR-57 (05/02) III-27 <br />
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