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999 <br /> Remediation Plan: Columbus Mine Portals <br /> Remediating Party: Sunnyside Gold Corporation <br /> P.O. Box 177 <br /> Silverton, CO 81433 <br /> contact William B. Goodhard <br /> Resident Manager <br /> Identification of Lands <br /> The Columbus mine portals and waste dumps lie immediately north of Animas Forks, San <br /> Juan County Colorado. See attached map. <br /> Identification of the Waters of the United States Potentially Affected <br /> This property sits between the confluence of the Animas River and the West Fork of the <br /> Animas River. <br /> Physical Description of Conditions <br /> The area consists of, two mine portals and two waste dumps. The lower portal discharges <br /> onto the mine dump and percolates through it. The dumps are exposed to rainwater and snowmelt <br /> as well. The regional geology is volcanic rocks with narrow veins containing base metals;Fe, Pb, Cu <br /> and Zn. Sampling of the waters in this area indicate that even though the portal discharge is small, <br /> there is a substantial increase in dissolved metal loading to the Animas River. <br /> Description of Project <br /> The waste dumps need to be isolated from portal flows as well as rainwater and snowmelt. <br /> The dumps will be regraded and hydrologic diversions installed to prevent run on conditions. The <br /> dumps would then be stabilized with basic pH material and revegetated to minimize percolation from <br /> rainwater and snowmelt. <br /> The two portals will be opened and studied for the placement of hydraulic seals. In order for <br /> hydraulic seals to be placed, SGC feels that sites meeting the following conditions need to be found. <br /> 1) Location far enough underground to avoid the near surface fractures and joints caused <br /> by weathering. <br /> 2) Adequate rock compressive strength for structural stability. <br /> 3) A length of the tunnel with minimal faulting or other geologic features that may serve as <br /> a leakage pathway. <br /> Ir• <br />