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2000 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 hydrologc consequences for the next year 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 can be combined; therefore, two copies of this single report detailing the cumulative effects are provided. Munger Canyon Mine was idle during the period. McClane Canyon Mine resumed production in the month of February 2000. 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 wtil 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 has been 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 305,332 tons were mined that year. As required by stipulations, a mine map for McClane Canyon showing important hydrologic features is included as Figure 3. Water was encountered while mining the Main East Entries during the month of April. A sump was established in the Main East Entries and the mine then began developing to the south. In response to comments made by the Division regarding the 1995 annual hydrologic report, Figure 1 -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 Mine permit. Mine Water Inflow /Discharge No water has been discharged from the mine and the flows into the mine are estimated in table 1. Previous hydrologic reports have shown that the inflow of water to the mine can be attributed to dewatering of a perched aquifer as well as surface water infiltration along 1