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L~' <br />6) Nlultiple narrow shear zones that were noted in the 2004 study have also <br />been observed during this investigation along the temporary north wall of <br />' the middle level of the quarry (Photo 9). The shear zones varied in width <br />from several inches to several feet across. The typical strike of the shear <br />' zones were 015°, or almost perpendicular to the wall exposure. <br />' 7) A,s noted in previous annual reports, a minor east-west striking unnamed <br /> fault zone is mapped in the northwest corner of the main pit, and is also <br /> visible in the east wall of the main pit (Figure 3). The rock within the fault <br />' zone is more broken and blocky, with parallel fracturing and iron-stained <br />di <br />th <br />t th <br />f <br />lt h <br />t di <br />Fi <br />t <br />i <br />t <br />f <br />rt <br />ld <br /> as an apparen <br />p o <br />measuremen <br />n <br />ca <br />e <br />a <br />e <br />au <br />su <br />aces. <br />s <br />e <br />' 80° to 85° to the south and a general strike azimuth of 260° to 270°. The <br />h <br />i <br />it b <br />i <br />t <br />l <br />20 <br />f <br />l <br />i <br />i <br />d <br /> n p <br />etween approx <br />ma <br />e <br />y <br />au <br />t zone var <br />es <br />n t <br />e ma <br />an <br />width of the <br />' S0 feet. As mining progresses, the north benches will continue to intercept <br /> the fault, which will increase the footage that the fault is exposed along the <br />' final walls. The fault will continue to be intercepted near the northwest <br /> comer of the pit as the pit is excavated to the final depth. Based on the <br />' average dip of the fault, at approximately an elevation of 6,260 feet, the <br /> fault may be exposed across the floor of the main pit. As mining in the main <br />' pit continues, monitoring of this interface will facilitate a better <br /> understanding of how the slope will behave. It is unclear at this time as to <br />' what impact the fault will have on overal! slope stability. <br />' 8) Raveling conditions resulting from rock fragmentation during blasting and <br />subsequent freeze/thaw conditions exist along each wall in the quarry, but <br />' appear more prevalent along the south wall. <br />' 9) The small surficial slide located in the exposed highwall face along the west <br />wall, which was noted in previous annual reports, appears unchanged from <br />last year. The slide does not have any impact on the overall stability of the <br />-12- <br />