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Mayo and Associates, LC <br />3.7.2.3 14 Headgate Fault (14 HG Fault) <br />In mid-January 1997, approximately 150 gpm discharged from the roof and floor in <br />14HG E3 as the 14 Headgate Fault (14 HG Fault) was exposed. During mine <br />development work on January 20, 1997, the mine floor catastrophically blew out as <br />approximately 8,000 gpm instantaneously discharged from the floor at crosscut 3 of <br />Entry 2 of the 14 Headgate (14HG E2 XC3). The water had a discharge temperature of <br />about 86°F and evolved copious volumes of gas. A thin milky white precipitate formed <br />on flooded mine surfaces. The mine floor blowout was located about 10 feet prior to <br />crossing the 14 HG Fault and about 200 feet northeast of the groundwater discharge <br />location in 14 HG E3. Groundwater discharge rates declined rapidly during the following <br />month Figure 16. <br /> <br /> <br />1 <br />soa <br />soa <br />>oa <br />~ ~a <br />a <br />~ 5001 <br />rn <br />s 40a <br />N <br />o soa <br />zoa <br />toa <br />0 <br />0 <br />~~ Figure 16 Discharge hydrograph of groundwater flow from the I4SEHG fault, <br />West Elk Mine. <br />Evaluation of Potential Groundwater Inflows 55 February 24, 2004 <br />Associated with E Seam Mining, <br />Wes[ Ells Mine, Somerset, Colorado <br />IV iU JV TU JV <br />Days (0 = 1!21197) <br />