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West Elk Mine 2004 Annual Hydrology Report 31 <br />• 4.5 Mine Water Inflows <br />In WY 2004, several significant mine water inflows occurred during mining in longwall Panel 22. <br />In December 2003 inflow from a fault at the 22 TG Entry was measured at 100 gpm. Another <br />inflow at 22 HG E3 was measured at 120 gpm, but dried up several weeks later. In addition, some <br />small inflows (<15 gpm) were encountered during mine development and longwall mining. These <br />flows and drips occurred as roof drips, rib seeps, and minor fault zones. Total mine inflows during <br />WY2004 were estimated at 129 ac-ft from faults, 25 ac-ft from F Seam inflows, and 12 ac-ft from <br />miscellaneous ground water for a total of 166 ac-ft (MCC, 2005). Inflows aze illustrated on Map 1 <br />and Figure 3. <br />4.5.1 NW Panels Sealed Sump <br />During WY2004, MCC water from the NW Panels Sealed Sump was drained through a borehole to <br />the NE Panels Sealed Sump. There was no discharge from the NW Panels Sealed Sump to the <br />Lone Pine Pipeline (MCC, 2005). <br />4.5.2 NE Panels Sealed Sump <br />• During WY2004, water collected in the NE Panels Sealed Sump was pumped out of the sump <br />using the mine water pumping facility (MWPF) up the vertical well and discharged to Sylvester <br />Gulch. A clarifying pond and energy dissipater system is located at this discharge point. <br />4.5.3 Mine Water Sampling <br />During WY2004 as in WY2003, sampling of mine water inflows was hampered by the locations of <br />the inflows. Fault inflows occur in law places on the mine floor, which allows mixing of belt <br />wash-down water, process water, road maintenance (road watering mixed with magnesium <br />chloride), and rock dusting operations. However, two representative mine water samples were <br />collected and analyzed at the Panel 23 Headgate and the Panel 24 Headgate. A summary of the <br />mine water quality is in Appendix H. <br />4.6 Mine Water Balance <br />A mine water balance was developed as a tool for water management to quantify [he water entering <br />and leaving the mine. The WY2004 mine water balance is summarized below and illustrated on <br />Figure 3. <br />~J <br />August zoos HydroGeo, Inc. <br />