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REP43740
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REP43740
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Entry Properties
Last modified
8/25/2016 12:46:02 AM
Creation date
11/27/2007 9:59:41 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
6/3/1996
Doc Name
B East Mains Mine inflow report
From
MOUNTAIN COAL CO
To
DMG
Permit Index Doc Type
MINE INFLOW REPORTS
Media Type
D
Archive
No
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and piping required to just keep up with the water, the inflow was estimated to be a maximum of <br />2,500 gpm. Shortly thereafter, flows in the fifth entry dried to only drips. <br />As with the inflow in the fifth entry, the flow in the fourth entry began to d'uninish within three to <br />four days. On May 7, 1996, the flow was measured at approximately 240 gpm. <br />MCC contracted with Wright Water Engineers, Inc. (W WE) to assist in the evaluation of the <br />inflows and to provide expertise and support to MCC's sediment pond water treatment program. <br />Messrs. Gary Witt and Pete Miller inspected the inflow, reviewed available data, and inspected the <br />surface land above the fault on April I 1 and 12, 1996. As MCC's Senior Geologist had recently <br />left MCC, ARCO Coal Geologist, Mr. Alex Papp, and a contract geologist with the Whitewood <br />Geologic Group, Mr. Lary Henchel, also participated in the inflow evaluation. The following is a <br />brief summary of the observations made during these evaluations, in addition to the descriptions <br />provided in this letter, above. <br />• The lazgest fault displacement in the sixth entry was estimated to be 2.5', upthrown on <br />the southeast side. <br />• The appazent displacement of the fault in the fifth entry was approximately 6' with a <br />dip angle of about 65'. <br />• Water emanating from the floor in the fourth entry was observed to be milky, <br />potentially the result of clays carried into the fault from another location or, more <br />likely, the result of the degassing of the water as it was dischazged. The milky color <br />was observed to be clear within several feet of the discharge location. The water is <br />probably off-gassing dissolved cazbon dioxide, due to the relatively lazge bicazbonate <br />concentration in the water. <br />• Hydrogen sulfide gas was detected (by smell) in the fourth entry at cross-cut # 19 for a <br />short period of time. This gas is not unusual in a coal mine, but has only occasionally <br />been encountered in the West Elk Mine. <br />• Flows observed by WWE personnel at the time of their inspection were entirely from <br />the floor. Dominant flow was from an area which had a surface opening of <br />approximately eight inches in diameter with a vertical discharge of approximately one <br />foot. Based on flow rate tables developed for measurements of vertical discharge <br />from a pipe (per Water Measurement Masrual, U. S. Bureau of Reclamation, 1984), <br />this flow converted to approximately 1,300 gpm. Utilszing this figure, along with the <br />operating capacity of the pumps and an estimate of the amount of water on the floor <br />bypassing the pumps, the total flow from the fault azea was estimated to be <br />approximately 2,200 gpm. <br />One issue discussed with WWE was how to ++~inimi~e the flows in the B-seam East Mains so that <br />development mining could continue. Options to intercept the water down-dip of the mining <br />included the following. <br />Angled drilling into the fault from the surface in Sylvester Gulch. The probability of <br />actually intercepting, even recognizing the fault when drilling, were determined to be <br />very small. Even if the fault were encountered, it may not contain water. Down-hole <br />
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