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4 <br />CLIMAX MOLYBDENUM COMPANY <br />August 25, 2000 <br />Allen Sorenson <br />Division of Mineral and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Robinson Lake Seep Collection <br />Dear Mr. Sorenson: <br />A Subsidiary of Phelps Dodge Mining Company <br />RECEIVED <br />kUG 3 1 2000 <br />. Division of Minerals and Geology <br />7 7`4{23 <br />Climax Mine <br />Hwy. 91 <br />Climax, Colorado 80429 <br />(719) 486 -2150 <br />Fax (719) 486 -2251 <br />Attached for your information is a plan for improvements to the Robinson Lake seepage collection <br />system. The attached designs are the result of discussions held with you in inspections held on <br />May 19, 1997 and September 4, 1997 in which we discussed acceptable approaches to improved <br />collection of seep waters at the toe of Robinson Reservoir. The plan calls for adding a factor of <br />safety to existing pollution prevention through expansion of the holding pond for spring snowmelt <br />surges, extending the height of the cuttoff wall to allow for improved visual checks of the water <br />level, replacement of the groundwater pumps with more maintainable submersible pumps, and <br />replacement a culvert between the upper surface ponds. Redundant pipelines will also be <br />relocated to prevent freezing during winter operations. <br />Upon completion of construction, Climax will provide the Division with a certification for <br />construction to the design specifications. Pump specifications will be provided with the water <br />management equipment list scheduled to be incorporated into the Hydrologic Protection portion <br />of the pending Climax Mine Financial Warranty. <br />These improvements do not modify the original function or construction of the cuttoff wall. Climax <br />plans to install these improvements through the month of September. <br />If you have any questions, please contact me at (719) 486 -2150, ext. 723. <br />Sincerely, <br />Bryce Romig <br />Climax Molybdenum Company <br />