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2.0 INTRODUCTION <br /> 2.1 Location and Brief Description of the Sunnyside Mine <br /> The Sunnyside Mine is located approximately 8 miles north of Silverton in the Eureka mining <br /> district in northernmost San Juan County, Colorado (Figure 1). Gold, silver, copper, lead, zinc, <br /> and cadmium ores have been produced from more than 150 miles of underground workings with <br /> a vertical extent of 2000 feet. The majority of the mine workings are located beneath Sunnyside <br /> Basin at the head of Eureka Gulch. Year-round access to the main part of the mine is via the <br /> 10,000 foot long American Tunnel, the portal of which is located at an elevation of 10,617 feet <br /> at the abandoned townsite of Gladstone. Secondary access is via the Terry Tunnel located in <br /> Eureka Gulch at an elevation of approximately 11,560 feet. The jeep trail to the Terry Tunnel <br /> is impassible during winter and spring. <br /> 2.2 Statement of Problem <br /> As a result of water reacting with sulfide bearing rocks, drainage from both the American <br /> Tunnel and the Terry Tunnel is low pH and contains mobilized heavy metals. The San Juan <br /> County Mining Venture (SJCMV), owners of the Sunnyside Mine, would like to alter present <br /> flow patterns and/or water chemistry in order to reestablish approximate pre-mine hydrologic <br /> conditions. <br /> In order to return to an approximation of pre-mine hydrology, it is first necessary to deduce the <br /> pre-mine hydrologic conditions. Present conditions must also be understood so that it will be <br /> sanjuan\sunny\l10361\oct9I.Rpt 4 <br /> e�� simon ��Mov E Hno,,Lru,H <br />