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© CLIMAX MOLYBDENUM COMPANY <br />A Suhsidiery of Phelps Dadge Corporation <br />April 11, 2002 <br />Mr. Allen Sorenson <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />RECER~.4ED <br />APR 15 2Q02 ~/ <br />~1V 1S1pn °f Minerals and Geology <br />HENDERSON OPERATIONS <br />19302 County Road 3 <br />Parshall, Colorado 804fifi <br />[303)569-3221 <br />Fax [9707 725-0039 <br />Denver, Colorado 80203 <br />RE: Relocation of Discharge, 3-Dam Seepwater Management, Henderson Mill, Technical <br />Revision TR-09/Permit No. M-77-342 <br />Dear Allen: <br />This letter is being provided to inform the Division of Minerals and Geology (Division) of a <br />proposed relocation of the 3-Dam Seepwater line discharge. Please find enclosed one set of <br />drawings detailing the proposed relocation. <br />Henderson would like to relocate the pipe discharge in order to move the accumulation point of <br />the metal oxide precipitation (sludge) that is currently taking place at the 3-Dam Seepwater line <br />discharge. The lines currently discharge just upstream of the Ute Park Station Seepwater inlet. <br />The low pH, high metal content 3-Dam Seepwater, when discharged into the more neutral pH <br />water of the 1-Dam Seepwater canal, precipitates metal oxides. At this location it is difficult to <br />clean the sludge out of the inlet works and causes premature scaling and build up in our pumps <br />and pipelines. By relocating the discharge to the head end of the 1-Dam Seepwater canal, we will <br />increase the detention time of the 3-Dam Seepwater in the canal allowing precipitation to take <br />place away from our pump station and in a location that is easier to clean. The 3-Dam Seepwater <br />will, of course, still be reporting to the same location for recycling into the mill water circuit. <br />Henderson would like to begin construction on this project in May 2002. <br />Please call if you have any questions or are in need of any further information before granting <br />approval for this change. I can be reached at (303) 569-3221 ext. 2214. <br />Very truly yours, <br />~~- <br />Erich Bower <br />Sr. Environmental Engineer <br />Climax Molybdenum Company <br />Enclosure <br />Cc: Mike Ley-Climax <br />Rich Wagner -Climax <br />