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Evaluation of Bear No. 3 Mine Landslide <br />landslides at the head of the slide mass. Downwazd movement of the colluvium along the upper <br />wetted bedrock colluvium interface effectively over-weighted the lower slopes. At the same time <br />the ongoing creep and decrease of internal shear strength continued. On November 15 the forces <br />for movement overcame the strength resisting them and the slide took place. <br />CONCLUSIONS <br />Field evidence does not indicate a causal relationship between the Edwards portal spring and <br />triggering of the November 1997 slide. <br />Field observations and data indicate that the Bear No. 3 mine slide was caused by a combination <br />of naturally occurring processes at a time when numerous other landslides in western Colorado <br />initiated or renewed their movements. <br />i~~~ `y' ~%~y~ <br />John W. Rold, C.P.G. <br />Certified Professional Geologist #448 <br />C:\831-032k1 I I ard\Geology.JR.dac <br />831-032.411 Wright Water Engineers, Inc. Page 15 <br />