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• 2004 ANNUAL HYDROLOGY REPORTS McClane Canyon Mine Permit No. C-80-004 Munger Canyon Mine Permit No. C-81-020 This report on the mine inflows, discharges and probable hydrologic consequences is submitted in compliance with the stipulations of the Mining and Reclamation permits for the mines noted above. The stipulations require a report for each permit. Since the mines are in close proximity, the effects are combined. The McClane Canyon mine was in operation during the year and Munger Canyon Mine was idle. This report shall first discuss the effect of McClane Canyon Mine on the hydrologic regime, next discuss the effect of Munger Canyon Mine, and then give an overview of the surface water system and groundwater monitoring. This report shall conclude with a discussion of the cumulative effect of both mines on the hydrology of East Salt Creek. McClane Canyon Mine Mine History and Production: The McClane Canyon Mine began production in 1977. The mine ceased production later that year when a fault was encountered. The mine remained idle until 1980. From 1977 through 1982 the mine produced a total of 184,365 tons of coal, In 1983 the mine was idled and remained under Division approved temporary cessation until November 1988. In December of 1988, 3,995 tons of coal was mined. In 1989; 125,200 tons of coal was produced. Production during 1990 totaled 208,945 tons. Production for 1991 totaled 194,000 tons of coal. 1992 Production was 7,914 tons. No coal was produced between 1992 and 1996. In 1997 production of 49,115 tons was accomplished. The mine was idle during 1998 and 1999. Production began again in February 2000 and has been continuous through the end date of this report. Production continued during 2004 with a production of 295,185 tons. Production from the mine during the year was retreat mining from 2"d North Panel, developing the East Mains and then developing the 3r° North panel. Production ended during the reporting period with retreat mining beginning in the 3rd North panel. As required by stipulations, a mine map for McClane Canyon showing important hydrologic features is included as Figure 3. Seepage from the 2nd North Panel was collected and used in the mine until a roof fall during April blocked access to the pump. Seepage followed the mine development in the 3rd North Panel. Seeps are encountered at the mine face during advance. The seeps usually dry up in a few days. The seeps emit from the floor. There is no detectable flow; however, enough water will accumulate during a 16-hour period that the faces need to be dewatered before mining can resume. A pump is located at the end of the 3rd North Panel. In response to comments made by the Division regarding the 1995 annual hydrologic report, Figure I - Water Sampling Locations, has been added. Figure 1 is a line diagram of the • drainages and water sampling locations that was derived from Figure 4.2-2 of the McClane Canyon Mi\ a permit.