Laserfiche WebLink
<br />for the Cresson ore. Specifically, Enclosure 7 presents the results of a direct shear test. The <br />friction angle for the Cresson ore was 38 degrees and the cohesion was 1275 psf. <br />It is highly unlikely that the friction of the Cresson ore will change. Further, the ore is <br />currently deposited on the Cresson Valle~;~,each facility and achieves stable outslopes equalling <br />the angle of repose, which further provides~ily verification of the stability of the material. No <br />slumps have occurred. Further, the lifts are stepped progressively farther from the edge of the <br />containment. This provides additional safety in the unlikely event there is sliding failure. The <br />reclaimed slopes are to be reduced to an overall 2.SH:1.OV, substantially less than the angle of <br />repose. Therefore, there do not appear to be uncertainties regarding the accuracy of long-term <br />stability projections. <br />CC&V recommends to the Office of Mined Land Reclamation that CC&V has satisfied the <br />information requirement it committed to with respect to the "strength" of the Cresson ore. <br />Additional tests are needed only if there is a substantial change in the strength characteristics of <br />[he material loaded onto the Valley Leach facility as evidenced by substantial changes in the <br />Mine exposures of ore (i.e., by substantial changes in geology). <br />you for your assistance in this matter. <br />S <br />Hardaway <br />Environmental Affairs <br />FILE: CC&VSTIP.O06 <br />9 <br />