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REP03405
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Entry Properties
Last modified
8/24/2016 11:34:13 PM
Creation date
11/26/2007 10:29:54 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Report
Doc Date
4/27/2005
Doc Name
2004 Bi-Annual Subsidence Report
From
J.E. Stover & Associates
To
DMG
Permit Index Doc Type
Subsidence Report
Media Type
D
Archive
No
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CRAGG SURVEYING <br />Stephen B. Cragg PLS <br />14762 2900 Road <br />• Hotchkiss, Colorado 81419 <br />Phone 970.872-2258 <br />Fax 970-872-3358 <br />August 30, 2004 <br />Bowie Resources LLC <br />Bowie No 2 mine <br />Paonia, Co. 81428 <br />Attn. Collin Stewart <br />RE: Bowie No. 2 Mine <br />Subsidence Survey <br />Juy 2004 <br />A subsidence monitortng survey network has been established by Cragg Surveying for the <br />Bowie Resources, Bowie No. 2 Mine. The survey is based on the existing survey control grid in place <br />around the Bowie No. 2 Mine surtace facilities. The points for the subsidence survey network have been <br />established using a Trimble 4800 GPS survey system. This GPS survey has been calibrated to the <br />existing survey control grid and then the survey has been extended to the north to cover the area where <br />the coal has been mined and will be mined in the future. <br />• The subsidence survey netvrork was started in May of 1999 with additional points added in August 1999, <br />November 2l)D0, November 2001, November 2002, and November, 2003. The majority of the <br />subsidence monitoring pants area # 5 rebar, 24 to 30 inches in length, with a 2 inch aluminum survey <br />cap. The qps are stamped: Cragg Surveying, LS 24944. <br />Suluidence stations up Hubbard Creek and stations over the north IongHrall panels D-8 and D-9 and <br />the west lorgwall panels WD-1 and WD-2 were surveyed from Juy 13 to Juy 22, of 2004 <br />The falowing tables list the survey points with the coordinate data, northing, Basting and elevation for <br />each point along with a table showing the relative shift in position <br />Some of the points show small changes in position which may be due to inherent error in the survey, <br />while some of the pants show noticeable shift in position resulting from subsidence due to the mining. <br />See the accompanying map which shows the surtace topography, underground mining plan, and the <br />location of the subsidence pants. <br />I• <br />52-1 <br />
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