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--------------- <br />CLIMAX MOLYBDENUM COMPANY Hendemp-n- Operation <br />a suntiaw.x 9F MWIar Doaza -AMm Company 19032 County R1. 3 <br />i ParShOll. Colorado 80459 <br />Metro (303) 279.0107 <br />Out of Scare (303) SSS-3221 <br />November 21, 2000 Fax 19701 725-01338 <br />Mr. Allen Sorenson T-4 <br />Environmental Protection Specialist ?-+ <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 z <br />W <br />Denver, Colorado 80203 <br />RE: 2 -Darn Decant Grouting and 3 -Dam Seepwater Management, Henderson W V <br />Technical Revision TR-09, Permit No. M-77-342 <br />Dear Mr. Sorenson: Q <br />This letter is being provided to the Division of Nfinerals 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 l4, 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 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 fiuther information. <br />T can be reached at (303) 569-3221 ext. 2214. <br />Very truly yours, <br />Erich Bower <br />Environmental Engineer <br />Enclosure <br />Cc; Mke Ley -- Climax <br />Rich Wagner - Climax