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GRAND VALLEY COAL COMPANY P.O. Box 70 Loma, Colorado 815240070 • (303) 858-3608 January 19, 1994 ii< <iiiii~iiiiiii~i 999 Ms. firica Crosby RFCf~I\/EG Division of Minerals and Geology 1313 Sherman St.; Room 215 JAN 21 1994 Denver, Colorado 80203 ~i:-ieicn ci r,~,n~ims a ~cuarv Re:~1993 Annual Hydrologic Report Munger an c ane Canyon Mines Dear firica; This report on the mine inflows, discharges and probable hydrologic 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. The McClane Canyon Mine was idle during 1993. The Munger Canyon Mine was idle for the entire report period. This report shall first discuss the effect of McClane Canyon Mine on the local bedrock aquifer, 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 fiast Salt Creek. McCLANS CANYON MINB 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 thru 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 totalled 208,945 tons. Production for 1991 totalled 194,000 tons of coal. 1992 Production was 7,914 tons. No coal was produced during 1993. • A mine map for McClane Canyon showing important hydrologic features is included as Figure 1.