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• 2005 AHR McClane & Munger Canyon Mines Page 4 <br />Munger Canyon Mine <br />The Munger Mine has been seal~sd and it is not expected to be reopened. There was <br />no water encountered in mine; therefore, there has been no effect on the hydrologic <br />regime of the area. The current rnine workings are shown on Figure 4. <br />Precipitation <br />Based upon Bureau of Land Management records from a rain gage in Ashford Canyon, <br />the 2005 water year experienced 26.68 inches of precipitation compared to average <br />precipitation of 18.16 inches. The rain gage is not located at the mine but about 3.5 <br />miles north at an elevation of 58Sa5 feet compared with 5610 at the portals. The daily <br />rainfall record is detailed on Table 2. The greatest 24 hour precipitation event during <br />the year, 1.4 inches, occurred on January 11~'. Figure 2 presents a graphical <br />comparison of the 2005 total monthly precipitation and the average monthly <br />precipitation for the period 1977 through 2005. <br />Precipitation data are obtained from Jim Scheidt, BLM, limscheidt(a~co.blm.gov. <br />Effect of the Mine on the East Salt Creek Regime <br />Surface Water <br />Due to the limited disturbance of the mines there is little chance any significant effect on <br />the quantity or quality of the sufi3ce waters near either mine sites has occurred. As the <br />Division notes in its approval package for the Munger Canyon Mine, the total area that <br />will be disturbed by both mine sites amounts to 0.12 percent of the area of the East Salt <br />Creek drainage basin above the mines. <br />Surface water samples from East Salt Creek were obtained for all four quarters during <br />the water year at monitoring stations SW-1, SW-8 & SW-4. Monitoring is not pertormed <br />at SW-1 if the mine is discharging since SW-1 is an upstream monitoring point. Results <br />from all water samples collected during the water year are presented in Table 4. The <br />results from the samples collected from East Salt Creek above and below the mine site <br />are generally the same for all parameters. <br />Table 6 contains analyses of mine water discharged into East Salt Creek. The mine <br />water had a TDS value of 1612 rng/I. The average TDS value for East Salt Creek at <br />SW-1 was 1482 mg/I during the water year. Therefore, mine water discharge <br />supplemented and slightly degraded the water quality in East Salt Creek during the <br />year. <br />One sample was obtained from McClane Creek below the mine and another from <br />Munger Creek above the mine during the year. Two samples were obtained from <br />Munger Creek below the mine. <br />• <br />