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`//~atheson <br />`~ finingg <br />'~ onsulfants, Inc. <br />11460 W. 44th Ave., Suite 6 <br />Wheat Ridge, Co 80033 <br />30356-5638 <br />Fax 303-456-5639 <br />CRIPPLE CREEK AND VICTOR GOLD MINING COMPANY <br />GROUND MOTION ATTENUATION STUDY <br />NORTH CRESSON AREA <br />February 25, ?000 <br />Executive Summary <br />n <br />U <br />Matheson Mining Consultants. Inc. (MMC) monitored four test blasts located in the <br />North Cresson area on Cripple Creek & Victor Gold Mining Company (CC&V) property <br />east of the town of Cripple Creek, Colorado, with eleven seismographs. A photograph <br />index and photos of the test site and procedure follow the body of this report. Attached <br />as Appendices I through V are: a map of the test site, seismograph calibration certificates. <br />seismograph information. seismograph records, and linear regression analysis, <br />respectively. <br />Scaled distance is a relationship used in explosives engineering to interrelate blasts with <br />different maximum charge weights per delay period: <br />SD = D~ F{~ <br />Where: SD =Scaled Distance <br />D =Distance, in fee[ <br />W =Maximum charge weight per delay period, in pounds <br />The recommended scaled distance to not exceed a 0.50 inches per second peak particle <br />velocity for the North Cresson Area is 43.8. The analysis is comprised of forty data <br />points and has a correlation coefficient of 0.913. this is an excellent correlation <br />coefficient. <br />Below is Table 1 showing distances and charge weights per delay based on the 0.50 inch <br />per second peak particle velocit}' and the site-specific scaled distance determination of <br />43.8. The charge weight per delay is the maximum explosive charge that may be fired at <br />a given distance. <br />\J <br />