Laserfiche WebLink
addition, greater fracture permeability associated with a higher degree of welding of the <br /> volcanics is expected beneath the Gladstone area than beneath the Sunnyside Basin. The local <br /> anisotropy and inhomogeneity of the fracture permeability would facilitate ground-water <br /> movement toward Cement Creek. Hence, the majority of water in the bedrock flow system is <br /> inferred to have moved from the Sunnyside Basin to the Cement Creek drainage where it <br /> discharged as springs and seeps. <br /> Field evidence supports the id that the preferred ground-water flow direction is southwest <br /> rather than southeast in the vicinity of the Sunnyside Mine. Field observations by Simon Hydro- <br /> Search staff during July and August, 1991 located a greater number of visible springs and seeps <br /> in the Cement Creek drainage,i above Gladstone, than in Eureka Gulch. Furthermore, the <br /> springs and seeps in the two forks of Cement Creek above Gladstone are preferentially located <br /> on the east side of the creek, in icating a source to the east is most likely. Finally, based on <br /> the volume of dumps, the Silver Ledge Mine, located on the east side of the South Fork of <br /> Cement Creek, appears to have approximately the same extent of underground workings as the <br /> Big Colorado Mine located on the adjacent opposite side of creek. Yet, based on the present <br /> flow from the portals, the Silver .edge Mine intercepted approximately ten times as much water <br /> as the Big Colorado Mine. <br /> 3.1.5 Pre-Minim Ground-Water Chemistry <br /> Prior to any mining, ground wat�r in the vicinity of the Sunnyside Mine is thought to have had <br /> a higher level of dissolved meta s and a lower pH than ground water in unmineralized areas. <br /> sanjunn\sunny\110361\ocO1.kpl 21 <br />