1996-05-06_HYDROLOGY - M1977378 (3)

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Attachment SP Page SP- 1 Permit No. CO-0044768 Mine Remediation Plan Sunnyside Mine Pool Mitigation Remediating Party: Sunnyside Gold Corporation Received P.O.Box 177 Silverton,CO 81433 contact William B.Goodhard Resident Manager Durango Flo d Office Division of Mk*rWs&G*0kW 1.Description of Mining Activities aysical Description of Conditions Mining at the Sunnyside first started in the late 1880's and continued under various operators. Sunnyside Gold Corporation acquired the property in 1985 and operated until August of 1991 when closure of the mining operations initiatedd final reclamation. The Sunnyside Mine produced precious and base metal ores. Sunnyside Gold Corporation (SGC) is in the process of final reclamation at Sunnyside. As part of the final reclamation, SGC has proposed and the Colorado Mined Land Reclamation Board(MLRB)has approved(Nov 1993),the installation of hydraulic seals within the mine workings in order to return the hydrologic regime to an approximation of premining conditions. The seals are to be used to minimize flow through old workings while forcing a majority of the water around the mine workings. As the mine pool fills with oxygenated water,the mountain will be resaturated and historic flow paths will resume. After the oxygenated water reacts with sulfide mineralization,the mine pool will be devoid of oxygen and the pool will equilibrate at a near neutral pH. General Description of the Mining Site The Sunnyside Mine surface access is Northeast of Silverton, San Juan County,Colorado. The Terry Tunnel surface facility and Sunnyside Basin is accessed by taking State Highway 110 North out of Silverton to the historic Townsite of Eureka then up Eureka Gulch. See Attached Site Map Identification of Lands Underground workings of Sunnyside Mine located in San Juan County,Colorado. Workings he under Sunnyside Basin with access tunnels from Eureka Creek,Terry Tunnel and the old twnsite of Gladstone in Cement Creek,American Tunnel. See attached location map. Latitude 37 degrees 54 minutes Longitude 107 degrees 37 minutes fdentifcation of the Waters of the United States Potentially Affected Headwaters of Eureka Creek and Cement Creek. Both flow into the Animas River at or upstream of Silverton, Colorado. See attached map. 2.Site Ma Attached 3.Stormwater Management Controls At the Terry Tunnel the existing settling ponds will be used for catchments to prevent potential spillage at the injection site from entering the surface waters which flow past the Terry Tunnel. If the project is relocated to Sunnyside Basin then catchments will be installed in order to prevent potential spillage at the injection site from entering the surface waters which flow out of Sunnyside Basin. The Surface area to be used at the Terry Tunnel is covered by the following permits:MLR Permit#M-77-378,CDPS Discharge Permit#CO-0036056 and CDPS Stormwater Permit#COR-040058.