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observed in temporary slopes and these conditions will continue to be observed during further <br /> development in this area. Rock mass properties significantly improve with depth. due to <br /> higher strength parent rock, less weathered and more massive than the rock mass above, <br />which is composed of low strength rock material with weathered and slick joint surfaces <br /> . <br /> The overall slope on the west side appears stable. Localized instabilities are infrequent and <br />consist of relatively small loose blocks and.wedges, generally less than 10 feet in length. <br /> These instabilities are as expected for the highwall and only cause localized operational <br />' inconveniences. <br /> The overall slope on the north end appears stable. Localized instabilities are infrequent and <br /> consist of relatively small loose blocks and wedges, generally less than 10 feet in length. <br />' These instabilities are as expected for the highwall and only cause localized operational <br /> inconveniences. <br />' 5.03 North Quarry <br /> The highwalls and benches are aligned curvilinear bearing approximately 000° to 080° <br />' azimuth as the pit extends to the east. The rock type is primarily granite gneiss with mafic <br /> and felsic intrusions (felsite dikes and pegmatites). <br />' The primary joint set coincides with foliation of the rock mass. In general, the foliation dips <br /> in a west/southwest direction with minor trends notthwest. Foliation orientation has local <br /> variations due to several sets of localized anticline/syncline structural features in the rock <br /> mass. The primary joint set is parallel to sub-parallel to the mining face on the western side, <br />' perpendicular [o sub-perpendicular on the northern side dipping into the mining face. Dip <br /> angle varies from approximately 5° to 35°. This foliation joint set is shown in Table I. <br />' Spacing of joints in the primary joint set typically ranges from 0.5 ft to 2 ft. Joint surfaces <br /> are typically tight and appear slightly to moderately weathered. Joints are very continuous in <br /> certain locations, and discontinuous in other locations. <br />Two dominant secondary joint sets are present. These joint sets are orthogonal [o each other, <br />with strike orientation of one in a northeast direction, the other in a southeast direction. <br />These joints dip steeply [o near vertical out of the mining face. The secondary joint sets are <br />shown in Table I. Spacing of joints in the secondary joint set typically range from 1 to 5 feet <br />Joint surfaces are typically tight and appear slightly weathered. Joints are both continuous <br />and discontinuous. <br />The overall slope appears stable. Localized instabilities are limited to single benches and are <br />evidenced by relatively small block and wedge shaped slip surfaces, generally less than 10 <br />feet in length, and slab surfaces of up to 40 fee[ wide and 50 feet wide where primary jointing <br />is continuous and dipping out of the slope and is intercepted secondary jointing. These slip <br />surfaces are as expected for the highwall and cause only localized operational inconveniences. <br />The overall condition of the slope on Bench 4 is "competent". Isolated shear zones exist at <br />Locations A, C, and D on Figure 1. <br />G~1RR01 F.C751?0700 Abelson Quarry10081_'W 11Repon12001 geoteehnical adJrnJmn.tl~x <br />