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• <br />Table l: Dislunce vs. Charge [4'eighi jor SD=-13.8 <br />Distance, feet Charee Weis t, ounds er Sms dela - <br />500 130 <br />1000 531 <br />1500 1.173 <br />2000 2,085 <br />2500 3.258 <br />3000 4,691 <br />3500 6.385 <br />4000 8.340 <br />4500 10.555 <br />5000 13,031 <br />INTRODUCTION <br />Matheson Mining Consultants, Inc. (MMC) was retained by Cripple Creek & Victor Gold <br />Mining Company (CC&V) [o perform a ground motion attenuation study of ground <br />• vibrations created by test blasting in the North Cresson area. This azea is located east of the <br />town of Cripple Creek, Colorado. Appendix 1 contains a map showing the test shot and <br />seismograph recording locations. Photographs showing test shots and seismograph <br />locations aze located after the text of this report. Eleven seismographs were used to record <br />the ground motion from each of four test blasts. The seismographs were positioned at <br />varying distances from each test blast towards the nearest structures in Cripple Creek. <br />Particle velocity data acquired in the field are input into a least squares linear regression <br />anal}•sis program. The United States Office of Surface Mining and Reclamation <br />Enforcement (OSMRE) have approved this program. The regression analysis yields asite- <br />specific vibration attenuation formula in the form: <br /> <br />Where: PPV =the peak particle velocih• in inches per second, <br />H =the velociq• (y axis intercept) at a scaled distance of one, <br />SD =scaled distance =distance from shot to recorder divided <br />by the square root of the charge weight, and <br />B =the slope of the cun•e. <br />The program also yields the correlation coefficient (goodness of fit), ~''. The procedure for <br />• the analysis performed is outlined in the "Blasting Guidance Manual:' March 1987, <br />published by the OSMRE. <br /> <br />