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CLIMAX MOLYBDENUM COMPANY <br />MOLYBDENUM., Gf v"vwn Dcop. C q'K m <br />.August 14. 2000 <br />Via Hand Delivery <br />vlr. 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 Decent Grouting and 3 -Dam Seepwater Management. Henderson Mill. <br />Technical Revision TR -09. Permit No. M -77 -342 <br />Dear Mr. Sorenson: <br />Henderson Overall ions <br />PO i or 58 <br />mire roioreoo E.C43B <br />1303) 569 3221 <br />max 13031 569 2830 <br />This letter and other submittals are being provided to the Division of Minerals and <br />Geology (Division) per the requirements of the April 27. 2000 conditional approval <br />granted by the Division for the above mentioned technical revision. Please tied enclosed <br />a construction summary ot'the 3-Darn decant grouting project from Denver Grouting. as <br />well as a materials testing report from Inter - Mountain Engineering regarding the actual <br />grout used. Also included is a letter report from Mr. Chris Hatton of L addressing the <br />Division's concerns regarding possible 3 -Dam stability <br />- issues from the decant line <br />penetration. These three items fulfill Stipulations No. 3 and 4 from the Division's <br />conditional approval letter. However. it should be noted that some of the compressive <br />strength test results on the grout did not meet our specification. We are currently <br />addressing this concern with Denver Grouting but were unable to resolve it before this <br />submittal was due to the Division. Henderson will respond to the Division with more <br />information regarding this matter by September 30. <br />Please feel free to call if you have any questions or are in need of any further information. <br />can be reached at (303) :69 -3221 ext. 2214. <br />Very truly yours. <br />1 I. <br />Erich Bower <br />Environmental Engineer <br />Enclosures <br />Cc: Ante Beierle — Climax <br />Mike Le) — Climax <br />Rich Wagner - Climax <br />