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-- GRAND VALLEY COAL COMPANY P.O. Box 70 Loma. Colorado 815240070 • (303)858-3608 ~II III'I~II~~~~~ II~ 999 January 29, 1993 R~~~9~p~ ) FEB 0 11993 L Ms. Janet Binns MINENgLSeiu~~` Division of Minerals and Geology - 1313 Sherman St.; Room 215 Denver, Colorado 80203 Re: 1992 Annual Hydrologic Report Munger and McClane Canyon Mines Dear Janet; 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 produced coal during the last quarter of 1991 and was idle during 1992. 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 Bast Salt Creek. McCLANB CANYON MINE Mine History end 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. A mine map for McClane Canyon showing important hydrologic features is included as Figure 1.