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' GRAND VALLEY COAL COMPANY <br />P.o. soX 70 <br />Loma, Colorado 815240070 <br />(303)858-3608 <br />iii iiiiiiiiiiiuiii <br />999 <br />Tanuary 29, 1993 ~ =•.. "_' <br />^r~~pr 1 <br />FEB 0 11993 <br />L <br />Ms. Janet Binns MINERgLS ~ Vt~` <br />Division of Minerals and Geology <br />1313 Sherman St.; Room 215 <br />Denver, Colorado 80203 <br />Re~1992 Annual Hydrologic Report <br />unger an c ane anyon Mines <br />Dear Janet; <br />This report on the mine inflows, discharges and probable hydrologic <br />consequences for the next year is submitted in compliance with the <br />stipulations of the Mining and Reclamation permits for the mines <br />noted above. The stipulations require a report for each permit. <br />Since the mines are in close proximity, the effects can be combined; <br />therefore, two copies of this single report detailing the cumulative <br />effects are provided. The McClane Canyon Mine produced coal during <br />the last quarter of 1991 and was idle during 1992. The Munger <br />Canyon Mine was idle for the entire report period. <br />This report shall first discuss the effect of McClane Canyon Mine on <br />the local bedrock aquifer, next discuss the effect of Munger Canyon <br />Mine then give an overview of the surface water system and <br />groundwater monitoring. This report shall conclude with a <br />discussion of the cumulative effect of both mines on the hydrology <br />of East Salt Creek. <br />McCLANE CANYON MINE <br />Mine History and Production <br />The McClane Canyon Mine began production in 1977. The mine ceased <br />production later that year when a fault was encountered. The mine <br />remained idle until 1980. From 1977 thru 1982 the mine produced a <br />total of 184,365 tons of coal. In 1983 the mine was idled and <br />remained under Division approved temporary cessation until November <br />1988. In December of 1988; 3,995 tons of coal were mined. In 1989; <br />125,200 tons of coal were produced. Production during 1990 totalled <br />208,945 tons. Production for 1991 totalled 194,000 tons of coal. <br />1992 Production was 7,914 tons. A mine map for McClane Canyon <br />showing important hydrologic features is included as Figure 1. <br />