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Ransom Mine Portal <br /> Page 3 <br /> A its- <br /> Using available data, zinc loading was calculated 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 <br /> of exposing a 1:1 ratio by weight of material to deionized water The mixture is briefly mixed <br /> then allowed to set for 30 minutes. The sample was then filtered (0 45 micron) and analyzed <br /> 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 <br /> dump or tailings site and loading based on 1:1 water bath test results For comparison to adit <br /> flow loading projects, the annualized loading was converted to an average daily loading. <br /> Based on these assumptions and procedures, Sunnyside estimates that the average daily <br /> loading for this site may be as much as 2.6 pounds per day. Sunnyside is under no obligation to <br /> defend these estimates and they should only be used as an estimate. Sunnyside does not represent <br /> that its mitigation project at this site will remove any specific percentage of metals loading from this <br /> site; the loading estimate contained herein does not form the basis of an enforceable permit obligation. <br /> Description of Project <br /> The portal will be opened and studied for the placement of hydraulic seals. In order for a <br /> hydraulic seal to be placed, SGC feels that a site meeting the following conditions will need to be <br /> 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 tunnel with minimal faulting or other geologic features. <br /> 4) Adequate ground cover over the potential site to resist the hydrostatic forces from the <br /> potential maximum head <br /> sealing <br /> If an acceptable location can be found, SGC will design and install a hydraulic seal After <br /> is complete, the seal will be contact grouted and the diversion pipe, if necessary for <br /> construction,grouted Any near surface fracture flows will be diverted to avoid contact with waste <br /> material and the portal closed See attached paper on hydraulic seals <br />