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OL%RAY SIL4ER A4/,%,ES <br /> range between 28-30 GPM, though an upper discharge limit of 60 GPM has been <br /> proposed as a factor of safety. <br /> Early design data has indicated that a that a filtration system will be used, with real-time <br /> turbidity monitoring at the mill control room to allow for rerouting during upset <br /> conditions. High turbidity water can be routed back to the process water stream or tailing <br /> thickener instead of being discharged. While the exact equipment cannot be specified at <br /> this time, permission to discharge is needed to guide Mill design and the design and <br /> engineering of the Mill water treatment discharge equipment. OSMI commits to meeting <br /> CDPHE Regulation 41 groundwater standards, as presented in the permit, at the point of <br /> discharge from the Mill discharge treatment system. <br /> Once final design and testing has proven an adequate final treatment design, this will be <br /> submitted under a separate TR or as part of the Annual Report as the Division requests. <br /> 3)Please provide a reclamation cost estimate for the demolition and disposal of all mine related <br /> structures, existing and proposed. <br /> Please find the attached reclamation cost table, which is updated from Table L-2 in <br /> Amendment 01 (AMO1) of the Permit. The table presents the information found in the <br /> previous table, along with the changes proposed in this technical revision and the new <br /> cost. Where no changes are being made to the buildings no change in cost has been <br /> calculated with one exception. During review of the table, a mistake in the thickener cost <br /> was discovered. The AMO1 version of Table L-2 overestimated the Thickener <br /> reclamation cost at $23,000 and failed to include that amount in the total, which was <br /> listed as $23,700. OSMI estimates the cost of Thickener removal at $5,000 and has <br /> included the estimate in the new total of$35,100 for existing and proposed buildings. <br /> OSMI appreciates the DRMS consideration of this technical revision. <br /> Sincerely, <br /> CQ_�J_ Q . Gr'� - <br /> Clinton L. Fletcher <br /> President, Ouray Silver Mine <br /> PO Box 564, 1900 Main Street, Unit 1, Ouray, Colorado, USA 81427 <br /> Tel. 970-325-9830— Fax. 970-325-9824 <br />