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- 22 - <br />ible without a better knowledge of geologic and hydrologic <br />conditions of the area. Based on preliminary results of our <br />analyses we feel that a distance of 150 feet or more, as <br />recommended in our report (1980), appears to be appropriate. <br />?4ost of the storage is proposed on a wide upper bench <br />portion, above the distinct north-south trending ridge, west <br />of the proposed entries. The waste pile is, however, designed <br />also on the narrower portion of the bench, above the proposed <br />mine entries. <br />We feel that because of the importance of the mine entries, <br />the waste rock pile portion directly above them should be <br />eliminated for safety reasons. The available storage yardage <br />within the area above the entries is limited and we feel that <br />it would be preferable to increase the storage volume on the <br />wide bench portion west of the mine entries rather than to <br />load the bench portion immediately above the mine entries. <br />5.3 OTHER FACTOP.S INFLUENCING STABILITY <br />The stability of the area will be influenced not only by <br />the future waste rock pile; mining activity below the upper <br />bench may have a certain impact on the stability as well. <br />Driving of the tunnel entries through the landslide de- <br />posits is the first factor. As discussed in our previous <br />report, driving of these tunnels has to be carried out in such <br />a way that no disturbance of the old landslides would occur. <br />Careless driving may result in the renewal of the deformations <br />of the old landslides. For obvious reasons, any such disturb- <br />ance should be avoided. <br />ccoa+rdro ea+w~nHC, iNC. <br />