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III IIIIIIIIIIIIIIII <br /> 999 <br /> ! 5-7 7-3-7 ' <br /> Amme,diation Work Plan: London 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 London Mine is located in Burrows Gulch to the north of Houghton Mountain, San Juan <br /> County Colorado. See attached location and site maps. <br /> Identification of the Waters of the United States Potentially Affected <br /> Burrows Creek is above the confluence with the North Fork of the Animas River. See <br /> attached location map. <br /> Physical Description of Conditions <br /> There are up to five portals in the area,three which appear to discharge continuously and two <br /> discharge during high runoff, two waste dumps and a shaft. Water flowing from these areas is low <br /> in pH and appears to carry dissolved metals. The dumps are exposed to stormwater events as well. <br /> The regional geology is volcanic rocks with narrow veins containing base metals; Fe, Pb, Cu and Zn. <br /> Sampling of the waters in this area indicate that even though the portal discharges are small, there is <br /> a substantial increase in dissolved metal loading to Burrows Creek. <br /> Site Loading Estimate <br /> Based on limited information, the site loading estimate for this project site is based on: <br /> Adits- <br /> Using available data,zinc loading was calculated based on the average flow and average zinc <br /> values. <br /> Mine Waste Dumps and Tailings Piles- <br /> Site composite soil samples were tested using a water bath extraction. This test consists of <br /> exposing a 1:1 ratio by weight of material to deionized water. The mixture is briefly mixed then <br /> allowed to set for 30 minutes. The sample was then filtered ( 0.45 micron) and analyzed for metals. <br /> Annualized loading was calculated using rainfall data (proportionally adjusted for site <br /> elevation between the Silverton and Red Mountain weather stations), exposed area of waste dump <br /> or tailings site and loading based on 1:1 water bath test results. For comparison to adit flow loadings <br /> projects, the annualized loading was converted to an average daily loading. <br />