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1.0 EXECUTIVE SUMMARY <br />The Sunnyside Mine is located approximately 8 miles north of Silverton, Colorado, in <br />northernmost San Juan County. Slightly acidic water with mobilized heavy metals <br />flows from both access tunnels to the mine. Sunnyside Gold Corporation (SGC) <br />proposes to install underground bulkheads in orderto contain mine drainage and allow <br />a return to an approximation of pre-mine hydrologic conditions. This report estimates <br />the influence that local hydrogeology will have on the effectiveness of the proposed <br />bulkheads, the impact that the proposed bulkheads will have on the ground-water <br />flow system, and the probable effects that installing the proposed bulkheads will have <br />on the hydrochemistry of ground water and surface water in the vicinity of the <br />Sunnyside Mine. <br />{n the vicinity of the Sunnyside Mine, ground water moves through fractures. <br />Permeability in the area is anisotropic, with greater permeability in a <br />northeastJsouthwestdtrection due to the dominant fracture orientation in the Eureka <br />graben. The original direction of ground water movement appears to have been from <br />the Sunnyside Basin (where the Sunnyside Mine workings are) towards Cement Creek. <br />The original ground-water flow direction is expected to eventually be reestablished if <br />the proposed bulkheads are installed. <br />sunny\wpltraci12251\Mart993.Rpt <br />N`al SItT10~ HYDRO-SEARCH <br />