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Colowyo Coal Company, L.P. <br />Blast Timing Analysis - Pattern InlUatlon Sequence <br />Matthew D. Lengedch <br />28-Mar-03 <br />Analysis of February 18, 2003, 4:04 PM, Cul No. 83, SUSGn 34+00 to 44+00 BIaSt RecorO <br />The tlesign was such each hole was Isolated by 17 mllllsewntl tlelays. <br />The rows were Isolated by 100 millisewntl tlelays, 2 100ms tlelays were used for A-ROW. <br />The lead Into the paftem was 16.b ft of tube, or 7/2 of Ne spacing <br />Tube between rows was calculated as the burden on F,D,B, rows, and Ne burtlen plus 112 the spacing on E,C,A rows. <br />Hole E-13 IniUalty showed 1030 Ibs of powder plus a 1 Ib. primer, h should have been 1930 plus a 1 IDs pdmer. <br />A 1 Ib of explosive is atltled to each hole to account for the primer. <br />Holes are space0 x133-foot intervals, fours are separatetl by 23 feet. <br />Shock tube was the inita5ng system, it bums a16.75 feet per millisecontl. <br />There is a 350 ms tlelay at each pdmer. The upper pdmer at 1/2 hole depth goes off first ini5ating Ne en5re hole. <br />This analysis tletermines Ne pounds of explosive detonatetl at any given millisecond, then bracket s the holes within 8 . <br />millisecond time pedods, assuming holes are spacetl equidistant between 77 milliesecontl delays <br />Maximum pounds of explosives allowetl by regulating scale-0istance equation within arty B millisewntl time period = 3303 <br />Holes Depth Feet of Shack Tube bum Ume Number of Delays Elapsetl Pounds of <br />Detonatetl of hole Isurtacel (tlownhole) Imsl 17 ms 100 ma 350 ms Ume (ms) Explosives <br />G53 75 16.5 37.5 8.0 1 358.0 2,285 <br />G-51 75 49.5 37.5 12.9 1 1 379.9 2,265 <br />G~9 79 82.5 39.5 18.1 2 1 402.1 2,413 <br />G+i7 83 115.5 41.5 23.3 3 1 424.3 2582 <br />G-45 79 148.5 39.5 27.9 4 1 445.9 2413 <br />G-43 BO 181.5 40 32.8 5 1 487.8 2451 <br />G-41 B7 214.5 40.5 37.8 6 1 489.8 2488 <br />G-39 80 247.5 40 42.8 7 1 511.6 2451 <br />G-37 78 280.5 39 47.3 8 1 533.3 2378 <br />G-35 77 313.5 38.5 52.1 9 1 555.1 2339 <br />G-33 76 348.5 38 57.0 10 1 577.0 2302 <br />G-31 77 379.5 38.5 61.9 11 1 598.9 2339 <br />G-29 70 412.5 35 88.3 12 1 820.3 2080 <br />G-27 87 445.5 33.5 71.0 13 1 842.0 1988 <br />G-25 68 478.5 34 75.8 14 1 863.9 2005 <br />G-23 68 511.5 34 80.8 15 1 885.8 2005 <br />G-21 62 544.5 31 85.3 18 1 707.3 1783 <br />G-19 65 577.5 32.5 90.4 17 1 729.4 1894 <br />G-17 B4 610.5 32 95.2 18 1 751.2 1857 <br />G-15 82 843.5 31 89.9 19 1 772.9 1763 <br />G-13 61 878.5 30.5 104.7 20 1 794.7 1748 <br />G-11 fit 709.5 30.5 109.6 21 1 816.8 1746 <br />G-9 61 742.5 30.5 114.5 22 1 838.5 1748 <br />G-7 81 775.5 30.5 119.4 23 1 860.4 1748 <br />G-5 61 808.5 30.5 124.3 24 1 862.3 1748 <br />G-3 80 841.5 30 129.1 25 1 904.1 1709 <br />