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GENERAL55280
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Last modified
8/24/2016 8:40:19 PM
Creation date
11/23/2007 10:11:44 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
General Documents
Doc Date
1/9/2007
Doc Name
Third Quarter 2006 Seismicity Report (Draft)
From
MGC
To
DRMs
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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INTRODUCTION <br />This report is prepared by David Butler, Senior Geophysicist, MicroGeophysics Corporation, <br />Wheat Ridge, Colorado, in partial fulfillment of a commitment by Mountain Coal Company (MCC) <br />to monttor seismicity (including the microseismic activity near bngwall mining activity) in the North <br />Fork Valley just east of Paonia, Colorado. This commitrnent is to the Colorado Division of Natural <br />Resources, Division of Reclamation, Mining and Safety. <br />The area encompassed extends east-west from Coal Creek Mesa to West Tower Mountain and <br />north-south from Terror Creek Reservoir to Lion Mesa (see Figure 1). The area includes the <br />Mountain Coal Mine operated by Arch, Inc. and the Bowie No. 2 Mine property of Bowie <br />Resources, LLC(BRL). Seismicity from the Elk Creek mine owned by Oxbow Mining, Inc. is also <br />recorded. <br />This report contains preliminary anatyses of data collected in the third quarter of 2006, i.e. from <br />July to September, 2006. Stations in the network operated previous to this quarter, but this report <br />contains only information about the third quarter of 2006. Seismological aspects of the analysis <br />are not yet completed. The velocity model, aground-motion attenuation model and network <br />magnitude definitions are under construction. This report focuses on progress towards <br />seismologic conclusions completed during the analysis period. <br />The seismic monitoring program was designed to monitor seismicity levels, provide locations for <br />local events, measure ground motion quantitatively, determine focal mechanisms when feasible, <br />and establish the ground motion regime that structures within the network are and will be subject <br />to during mining. <br />OPERATIONS <br />Station Locations and Descriptions <br />A mufti-station seismic array (10 stations) was installed by a cooperative effort of MCC and BRL <br />and the Spokane Research Laboratory of NIOSH/CDC (National Institute for Occupational Safety <br />and Heatth/Centers for Disease Control and Prevention). Station locations were determined by <br />consideration of access, permission of landowners, specific array geometry, radio line-of-sight to <br />the common recording stte (the Paonia Airport) or a repeater station and uniform coverage of the <br />target area (see Figure 1). <br />Theaocation of stations presently operating are shown on Figure 1 and corresponding station <br />coordinates are listed in Table 1. <br /> Table 1 <br />STATION <br />IDENTIFIER LATITUDE LONGITUDE ELEVATION NAME OF STATION OWNER <br /> (feet) <br />BWK 38.928 107.537 6701 Bowie fling Mine BRL <br />FGH 38.948 107.538 7201 Freeman Gulch Hubbard BRL <br />LI.M 38.857 107.461 8240 Lion Mesa MCC <br />MCD 38.881 107.474 7274 Minnesota Creek Dam MCC <br />MFB 38.958 107.559 7924 Middle Forest Boundary BRL <br />SPG 38.872 107.425 8174 South of Poison Gulch MCC <br />SEF 38.874 107.390 8667 Souk on East Flatiron MCC <br />TCR 38.982 107.564 8483 Teror Creek Dam BRL <br />WFW 38.901 107.424 8433 West Flatiron West MCC <br />WTM 38.941 107.591 7954 West Tower Mountain BRL <br />
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