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4.6 BLAST DAMAGE <br /> Blasting practices at the Sunnyside Pit have produced unacceptable amounts of wall <br /> damage. These practices were reviewed by JFI'A and recommendations for changes <br /> were made in a letter of August 15, 1988, which is attached as Appendix C. <br /> Modifications have been implemented and have produced substantial improvements <br /> at the west end of Bench 2, as shown in Figure 3.2. Practice of controlled blasting and <br /> application of smooth-wall blasting at the final wall are necessary to assure long-term <br /> stability of the pit. <br /> 4.7 STABILITY OF TALUS MATERIAL ON THE UPPER EAST <br /> WALL <br /> A section of the preexisting talus slope has been cut in the upper portion of the east <br /> wall. The face angle in the talus appears steep (600 to 700) and should be reduced for <br /> final reclamation. The face will be left as-is throughout production to protect a drainage <br /> ditch above the pit. This area should be inspected frequently to detect any cracking or <br /> movement indicating instability during operations. Potential for instability will increase <br /> if the talus becomes saturated by fall thunderstorms. <br /> 22 <br />