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• 1999 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. Both McClane and Munger Canyon Mines were idle during the period. This report shall first discuss the effect of McClane Canyon Mine on the hydrologic regime, next discuss the effect of Munger Canyon Mine, 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 were mined. In 1989; 125,200 tons of coal were 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 in temporary cessation during 1998 and the 1999 water year. As required by stipulations, a mine map for McClane Canyon showing important hydrologic features is included as Figure 3. There was no water encountered by mining in 1999; therefore, no hydrologic features are noted. In response to comments made by the Division regarding the 1995 annual hydrologic report, Figure I -Water Sampling Locations, has been added. Figure I is a line diagram of the drainages and water sampling locations that was derived from Figure 4.2-2 of the McClane Canyon Mine permit. Mine Water Inflow/Discharge No water was discharged from the mine and no flow into the mine was noted this year. Previous hydrologic reports have shown the inflow of water to the mine can be attributed to dewatering of a perched aquifer as well as surface water infiltration along the faults of the graben. During the mid 1980's, a clear picture of mine water inflows was obtained because water collected in the faces was regularly pumped to outfall 002 and discharged. The quantity of water discharged was recorded on a meter and • correlated with precipitation. The steady decrease in the amount of water pumped from the mine during the idle years is evidence of the creation of a dewatered zone in the