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<br /> BLAST DESIGN <br /> Smoky Hill & Golden Shale <br />Bench <br /> <br /> <br /> Rows Kr <br /> <br /> <br /> One or Two holes 1 <br /> Third and subsequent rows ie- buffer <br />blasts <br />0.9 <br /> <br /> <br /> Bedding Orientation Kd <br /> Bedding steeply deeping into cut 1.18 <br /> Bedding steeply deeping into face 0.95 <br /> Other cases of depositation 1 <br /> <br /> <br /> Geologic Structure Ks <br /> Heavily cracked. Frecuent weak <br />joins,weakly <br />cement layers. <br /> <br />1.3 <br /> <br /> Thin well-cemented layers with tigth joins 1.1 <br /> Massive intact rock 0.95 <br /> <br /> <br /> CHARGE CALCULATIONS <br /> 0.3048 <br /> Type of rock Smoky Hill + Golden Shale <br /> Rock Strength (weak=1, Strong =13) 7 <br /> Bench Heigth L 15.0 m 49 ft <br /> Bench width A 100.0 m 984 ft <br /> Diameter of Explosive De 140 mm 5.50 inch <br /> Bootom charge Spartan 400G Booster 40/Cs 400 g 0.99 lb <br /> Weight of column charge Lb 12.26 Kg/m 8.24 lb/ft <br /> Relative bulk strength (ANFO=100) Stv 100 100 <br /> Specific Gravity of the Rock SGr 2.28 t/m3 <br /> <br />t/m3 <br />0.065 t/ft3 <br /> Correction for number of rows Kr 1 1 <br /> Correction for bedding orientation Kd 0.95 1.18 <br /> Correction for Geologic Structure Ks 1.3 1.3 <br /> Density rock stemming 1.63 0.046 t/ft3 <br /> <br /> Max Burden (Anfo) B 0,008xDex(Stv/SGr)1/ <br />3 <br />3.9 m 12.9 ft <br /> Geologic correction factors B" B*Kr*Kd*Ks 4.9 16.0 <br /> Stemming T 0,7*B" 3.4 11.2 <br /> Subdrilling J 0.3xB" 0.0 m 0.0 ft <br /> Stiffness ratio L/B" 3.1 3.1 <br /> Blasthole depth H 1.05x(L+J) 15.8 m 51.7 ft <br /> Spacing S (L+7xB)/8 6.1 20.1 <br /> No of holes per row No A/S 16.3 48.9 <br /> Heigth of bottom charge hb 1.3xB" 5.1 m 16.8 ft <br /> Bottom charge Qb hbxLb 62.8 Kg 138.5 Lb <br /> Booster Ip 0.80 Kg 0.45 Lb <br /> Heigth of column charge hp H-(hb+T) 7.22 m 23.68 ft <br /> Column charge Qp hpxLp 88.52 Kg 195.16 Lb <br /> Total Charge weight per hole Qt Qb+Qp+lp 152.15 Kg 334.12 Lb <br /> Powder Factor q QtxNo/(B"xLxA) 0.340 Kg/m <br />3 <br />0.021 Lb/ft3 <br /> 0.149 Kg /t 0.327 Lb/t <br /> Specific perforation b NoxH/(B"xLxA) 0.035 m/m3 0.003 ft/ft3 <br /> 0.015 m/t 0.051 ft/t <br /> Specific consume stemming 0.00008 t <br />stemming/t <br /> <br /> <br />