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• 2004 AHR McClane & Munger Canyon Mines Page 4 <br />Munger Canyon Mine <br />The Munger Mine has been sealed 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 mine 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 2004 water year experienced 13.48 inches of precipitation compared to average <br />precipitation of 17.73 inches. The rain gage is not located at the mine but about 3.5 <br />miles north at an elevation of 5895 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, 0.9 inches, occurred on September 19"'. Figure 2 presents a graphical <br />comparison of the 2004 total monthly precipitation and the average monthly <br />precipitation for the period 1977 through 2004. <br />Precipitation data are obtained from Jim Scheidt, BLM, iimscheidtta-~.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 surface 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 two quarters during the <br />2004 water year. One was collected during the 151 quarter and another was obtained <br />during the 3rd quarter after a significant storm event. East Salt Creek was dry during the <br />4"' quarter 2003 and 2nd quarter 2004monitoring events. Results from all water samples <br />collected in 2004 are presented in Table 4. The results from the samples collected <br />from East Salt Creek above and below the mine site are generally the same for all <br />parameters. <br />Table 6 contains analyses of mine water discharged into East Salt Creek. The mine <br />water had an average TDS value of 1587 mg/I. The average TDS value for East Salt <br />Creek at SW-1 was 1843 mg/I during 2004. Therefore, mine water discharge continues <br />to supplement and improve the water quality in East Salt Creek. <br />The sample sites on McClane Creek were dry all four quarters. <br />LJ <br />