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III IIIIIIIIIIIIIIII • ~ <br />999 <br />~~~ CLIMA)3 MOLYBDENUM COMPANY Henderson~erations <br />a s~ee~om~y ei Peeps oeoae Mimnp Lompa~y 19032 County Rd 3 <br />~~~~ Parshall. Coloratlo BOa68 <br />Mecro (303] 271-0107 <br />Out of State (3031 569-3221 <br />November 21, 2000 ~~~~~~~~ Fan (970) 725-0036 <br />Mr. Allen Sorenson fVOV 2 4 ZOQD <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology Division of Rainerals 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 />This letter is being provided to the Division of Minerals and Geology (Division) as follow- <br />up to the requirements of the Apri127, 2000 wnditional 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. CMC feels that these new results are <br />satisfactory and back up the initial statements from Denver Grouting that sub-par flyash <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 />I can be reached at (303) 569-3221 ext. 2214. <br />Very tn~ily~yows, <br />Erich Bower <br />Environmental Engineer <br />Enclosure <br />Cc: Mike Ley -Climax <br />Rich Wagner -Climax <br />