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If permeability had been homogeneous and isotropic, the groundwater would have <br />moved in both directions. However, a strong anisotropy exists with enhanced <br />permeability both in a northeastlsouthwest direction and also dipping southwest. In <br />addition, greater fracture permeability associated with a higher degree of welding of <br />the volcanics is expected beneath the Gladstone area than beneath the Sunnyside <br />basin. The local anisotropy and inhomogeneity of the fracture permeability would <br />facilitate ground-water movement toward Cement Creek. Hence, the majority of <br />water in the bedrock flow system is inferred to have moved from the Sunnyside Basin <br />to the Cement Creek drainage where it discharged as springs and seeps. <br />Field evidence supports the idea that the preferred ground-water flow direction is <br />southwest rather than southeast in the vicinity of the Sunnyside Mine. Field <br />observations by Simon Hydro-Search staff during July and August, 1991 located a <br />greater number of visible springs and seeps in the Cement Creek drainage, above <br />Gladstone, than in Eureka Gulch. Furthermore, the springs and seeps in the two forks <br />of Cement Creek above Gladstone are preferentially located on the east side of the <br />creek, indicating a source to the east is most likely. Finally, based on the volume of <br />dumps, the Silver Ledge Mine, located on the east side of the South Fork of Cement <br />Creek, appears to have approximately the same extent of underground workings as <br />the Big Colorado Mine located directly across the creek. Yet, based on the present <br />flow from the portals, the Silver Ledge Mine intercepted approximately ten times as <br />much water as the Big Colorado Mine. <br />sunny\wplt,aci122511Mer1993.Rpc 2 "{ <br />Hal SII11011 HYDRO-SEARCH <br />