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REV94445
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Entry Properties
Last modified
8/25/2016 3:19:53 AM
Creation date
11/21/2007 11:40:28 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Revision
Doc Date
8/6/1998
Doc Name
REPORT ON DEVELOPMENT OF PROBABILISTIC EARTHQUAKE GROUND MOTIONS FOR CC&V PROJECT VICTOR CO
From
GOLDER ASSOCIATES INC
To
CRIPPLE CREEK & VICTOR GOLD MINING CO
Type & Sequence
TR27
Media Type
D
Archive
No
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• III'lllllllllllllll `1'R'9tu~7,~rT~3 <br />Golder Associates Inc. <br />4104 -148th Avenue. N.E. 999 ~ € - !~ ~1~A~ <br />Redmond. WA 98052 _ ~llsllOl~~.,i Ac <br />Telephone (425) 883-0777 a..v <br />Fax (425) 882-5498 <br />May 15,1998 <br />Cripple Creek & Victor Gold Mining Company <br />P.O Box 191 <br />2755 State Highway 67 <br />Victor, Colorado 80860 <br />ATTENTION: Ron Roberts <br />Our ref: 983-2348.135 <br />RECEIVED <br />AUG 61998 <br />DIV. OF MINERALS <br />& GEOLOGY <br />RE: REPORT ON THE DEVELOPMENT OF PROBABILISTIC EARTHQUAKE <br />GROUND MOTIONS FOR THE CC&V PROJECT, VICTOR, COLORADO <br />Dear Ron: <br />This letter provides a brief documentation of the approach, methodology, results, <br />conclusions and recommendations of an evaluation of earthquake hazards for the CC&V <br />Project neaz Victor, Colorado. The evaluation of earthquake hazards was focused on the <br />development of probabilistic earthquake strong ground motions for use in site seismic <br />stability analyses and site seismic design for the CC&V Project near Victor, Colorado. <br />INTRODUCTION <br />The purpose of the evaluation of seismic hazazds for the CC&V Project was to develop <br />probabilistically-based peak ground accelerations (PGA) for use in site seismic stability <br />analyses for the valley leach fadlity in particulaz, and Eor site seismic design, in general. <br />The development of the PGAs was a systematic and comprehensive office-based <br />investigation that utilized the existing literature, data, reports and maps regarding the <br />geology, structure, tectonics, seismidty and seismic hazazds for the site and the region of <br />the site. <br />Previous investigations of earthquake ground motions for the CC&V Project have <br />included work by Woodwazd-Clyde Consultants (1990) and Vector Engineering (1993). <br />Woodwazd-Clyde Consultants (1990) appear to have employed a modified probabilistic <br />assessment, whereby they conservatively estimated that a magnitude M 5.0 earthquake <br />(their 500-yeaz earthquake event for this fault) could occur on the nearest identified <br />seismic source (i.e., the Oil Creek fault at a distance of 8 km [5 mi]), and arrived at a PGA <br />of 0.1 g for the site. Vector Engineering (1993), using the same Oil Creek fault source <br />pazameters from Woodward-Clyde Consultants (1990) (i.e., magnitude M 5.0 and 8 km <br />[5 mi]), and incorporating a suite of eight earthquake attenuation relationships, arrived <br />OFFICES IN AUSTRALIA. CANADA. GERMANY. HUNGARY. ITALY. SWEDEN. UNITED KINGDOM. UNITED STATES <br />
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