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2006 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 2006 water year experienced 16.9 inches of precipitation compared to average <br />precipitation of 18.1 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, 1.4 inches, occurred on September 15"'. Figure 2 presents a graphical <br />comparison of the 2006 total monthly precipitation and the average monthly <br />precipitation for the period 1977 through 2006. <br />Precipitation data are obtained from Min L. Choy, BLM, min choyCc~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 occun•ed. 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 and SW-8. SW-4 only had flow during the <br />3`d quarter of 2006. Apparently the landowner is consuming all of the flow between <br />SW-8 and SW-4. The results from all water samples collected during the water year <br />are presented in Table 4. The results from the samples collected from East Salt Creek <br />above and below the mine site 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 an average TDS value of 1,650 mg/I. The average TDS value for East Salt <br />Creek at SW-1 was 3,532 mg/I during the water year. Therefore, mine water discharge <br />supplemented and slightly improved the water quality in East Salt Creek during the <br />year. <br />i• <br />