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DRILL & BLAST EVALUATION <br /> PROJECT M-2002-004 Red Rock Plant and Limestone Mine DATE 4/12/02 <br /> <br /> EXPLOSIVE 6.25 EXPLOSIVE DENSIT Y ( /cc) 0.9 BENCH H EIGHT (ft) 30 <br /> DIAMETER (in} <br />1 BURDEN 25/12 2.08 13.0 <br /> <br />2 SPACING burden x 1.2 16 <br /> <br />3 STEMMING burden x 0.7 9 <br /> LENGTH <br />4 SUBDRILL burden x 0,3 4 <br /> DEPTH <br />5 BLASTHOLE bench height 34 <br /> DEPTH + subdrill <br />6 POWDER 25 <br /> COLUMN <br />7 EXPLOSIVE 12 <br /> DENSITY <br />8 EXPLOSIVE FROM PERMIT 360 297 <br /> WEIGHT <br />9 VOLUME 226 CY <br /> OF SHOT <br />9a TONNAGE 443 TON <br /> OF SHOT <br />10 POWDER 1.31 #/CY <br /> FACTOR <br />10a POWDER 0.67 #(fON <br /> FACTOR <br /> <br />11 SCALE D/(W)'~2= 55 87 FULb'~Z <br /> DISTANCE 1500 to House Factor of safety 1.6 <br /> <br />12 ALLOWABLE <br /> EXPLOSIVE W=(D/Ds)2 744 Pounds <br /> WEIGHT Factor of Safety 744 1expl wt= 2.5 <br /> <br /> PEAK PARTICLE 300(SD)-16 0.24 in/sec <br /> VELOCITY Compared to Limit 0.5 <br /> Factor of Safet 2.1 <br />