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CLIMAX MOLYBDENUM COMPANY <br />4 $aerigry Of A44106 Ooaga Mina mow" <br />November 21, 2000 <br />Mr. Allen Sorenson <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: 2-Dam Decant Grouting and 3 -Dam Seepwater Management, Henderson Mill, <br />Technical Revision TR -09, Permit No. M-77-342 <br />Dear Mr. Sorenson: <br />Henderson Onerationg <br />19032 County Rh. 3 <br />Parshali. Colorado 80488 <br />Metro (303) 271 •o! 07 <br />Out of State (303) 569.3221 <br />Fax (9701 725 -0038 <br />This letter is being provided to the Division of Minerals and Geology (Division) as follow - <br />up to the requirements of the April 27, 2000 conditional approval granted by the Division <br />for the above mentioned technical revision. Please find enclosed a copy of the 2 -Dam <br />grout compressive strength test results from the re- coring and sampling that took place on <br />Tuesday, November 14, 2000. <br />Re- coring of the grouted 2 -Dam decant lines took place per the verbal agreement between <br />the Division and Climax Molybdenum Company (CMC) to reassess the non satisfactory <br />results of the initial compressive strength tests. Clv1C feels that these new results are <br />satisfactory and back up the initial statements from Denver Grouting that sub par fiyash <br />received during the project had caused the grout to cure more slowly. Although the test is <br />still not in compliance with the specification of 3,000 psi, it is widely agreed that this initial <br />specification is way in excess of what is required to have a well engineered and safe decant <br />line closure. CMC respectfully requests that the Division grant final approval on this part <br />of TR-09 despite this discrepancy. <br />Please feel free to call if you have any questions or are in need of any further information. <br />X can be reached at (303) 569 -3221 ext. 2214. <br />Very truly yours, <br />Erich Bower <br />Environmental Engineer <br />Enclosure <br />Cc: Mike Ley — Climax <br />Rich Wagner - Climax <br />