Laserfiche WebLink
To:Brian Tideman <br /> Cc:Clint Beck <br /> From: Rob Kisner <br /> Answers to questions 6.4.4 Exhibit D—Mining Plan <br /> a) How frequently does blasting occur? 0 to 2 blasts a week. Average 1 blast per <br /> week. <br /> b) Specify the blast pattern.Two patterns are used.9' x 9' and 10' x 10'pattern. <br /> c) Provide a cross section of a typical hole profile.See attached page. <br /> d) Specify the delay timing. In hole delay 350MS, Surface delay 25MS between <br /> holes in a row and row to row is(42 to 84MS sequential). <br /> e) Specify the air overpressure. 80 to 120 DBL <br /> f) Specify the peak particle velocity. This is measured in three areas: <br /> Trans.=0.15 to 0.70 Vert.= .14 to 0.50 Long.=0.20 to 0.50 <br /> g) Specify the maximum weight of explosives in an 8millisecond period. <br /> Example: <br /> Hole 20' deep with 5' of stemming leaves 15' x 4"dia. Filled <br /> with anfo weight of 5.8 pounds per foot. <br /> 15' x 5.8#=87#per hole with a maximum of 3 holes detonated <br /> at the same time=261 pounds maximum in an 8 millisecond period. <br />