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/Woodward4,.yde qW <br /> Engineering&sciences applied to the earth&its environment III I II I II I II IN III <br /> 999 <br /> /February25 1998 <br /> Mr. Bryce Romig <br /> Climax Molybdenum Compan3k/ <br /> Climax Mine <br /> Climax, CO 80429 <br /> Subject: Geologic Evaluation, Southeast Reservoir Rim Sidesl pe Eagle Park Dam, <br /> Cli:n:x Mine, Climax, Colorado <br /> Project No. 24435-3936 (T002) <br /> Dear Bryce: <br /> We have reviewed the letter prepared by Mr. Allen Sorenson of the Department of Natural <br /> Resources, Division of Minerals and Geology (DMG), and the DMG recommendations for <br /> monitoring the slope at the southeast reservoir rim of Eagle Park Reservoir. Our initial <br /> recommendations for monitoring are presented in our letter dated October 14, 1997. <br /> Comments on the DMG recommendations and our initial recommendations are presented in <br /> this letter. <br /> Background <br /> A shear surface was identified on the south side of the reservoir. The shear surface may be <br /> the slip surface of an ancient landslide or a fault trace. The shear surface orientation is <br /> approximately equal to that of the major joint set, and the regional faulting, which is shown <br /> on Figure 2 of our October 14 letter. The striations on the surface show northwestward <br /> movement, which is consistent with what would be expected from faulting or an ancient <br /> landslide moving into the valley. Regardless of the origin of the striated shear surface, the <br /> surface is a weakness in the bedrock which forms the reservoir slope. <br /> The recPrt excavation of oxide tailing and near surface soils has changed the slope <br /> configuration and may have reduced the passive resistance at the toe of the slope. There is a <br /> small chance that sliding could occur on this surface as the reservoir is raised. We do not <br /> believe that movement is likely because there currently appears to be relatively little driving <br /> force that would cause movement. <br /> Recommendations <br /> We recommended a prudent course of action would be to monitor the slope for a short period <br /> of time, with special attention paid to the period of reservoir filling. Apparently, the DMG <br /> has generally concurred with our recommendations for monitoring; however, their <br /> interpretation of our recommendations is somewhat different than we intended. The <br /> following paragraphs outline our recommended monitoring program. <br /> Woodward-Clyde International(Formerly Woodward-Clyde Consultants)A subsidiary of Woodward-Clyde Group, Inc. <br /> Stanford Place 3,Suite 1000.4582 South Ulster Street•Denver,Colorado 80237-2637 <br /> +1-303-694-2770•Fax:+1-303-694-3946 24435-3936/LE3 DOC 2/25/98(2 06 PM)/RPT <br />