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<br />iii iiiiiiiiiiiii iii <br />999 <br />STATE OF COLORADO <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />COLORADO DIVISION OF MINES <br />Hamlet J. Barry III, Commisaionar <br />DATE: March 28, 1989 <br />T0: Camille Farrell <br />FROM: Jce Nugent <br />RE: Blasting at Proposed Summit Pit <br />t. <br />After a review of the document "Potential for Blast-induced V1bra~ions at Cave <br />of the Winds from Mining at Proposed Summit Pit,' I have the fo1YD~ing <br />comments to make: z <br />3 <br />The equations used for determining the weight of explosives to be used~in <br />a delay period is valid. The equation provides a maximum weight of <br />explosives 30-percent less than currently used standards. <br />Particle velocity for the calculated maximum weight of explosives is <br />within the limits of barely perceptible, and the expected weight of <br />explosives to be used is 0.33 to 0.5 the calculated weight projected for <br />each delay period. <br />Seismic monitoring should be used for the first few blasts to establish a <br />baseline and document the actual results of blasting. <br />4629E <br />1313 Sherman Street Denver, Colorado 80203 B66-3401 <br />