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-zl- <br />5.0 CONCLUSIONS AIdD RECONII~IENDATIONS <br /> <br />1 <br /> <br /> <br />LJ <br /> <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br />5.1 GENERAL <br />We believe that the upper bench, where the future waste <br />rock pile is tentatively designed, is a morphological rather <br />than a landslide feature. It is evident, however, that land- <br />slides have developed on the slope below this upper bench <br />where the mine entries will be constructed. It appears that <br />these landslides are of a limited thickness (on the order of <br />several tens of feet); it is believed that they comprise old <br />failures of the crest of the upper bench. <br />The construction of the future waste rock pile or of any <br />other facilities within the bench or between the bench and <br />the mine entries should be carefully designed so that the <br />deformations of old landslides are not renewed or new land- <br />slides are not triggered. Such an incident could seriously <br />endanger the mine entries and the mine itself. <br />5.2 WASTE PILE LOCATION AND CONFIGURATION <br />It is evident that the location of the future waste rock <br />pile on the upper bench is a factor that decreases the over- <br />all stability of the area. Our preliminary evaluation shows <br />that the influence of the waste pile on the stability of the <br />area is of minor importance if the waste pile toe is located <br />at a safe distance from the crest of the bench and from the <br />zone of the landslides. The definition of the safe distance <br />between the bench crest and the toe of the pile is not poss- <br />~EOa+roao ca+w~nrw, iNC. <br />