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REP40721
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Entry Properties
Last modified
8/25/2016 12:36:53 AM
Creation date
11/27/2007 8:49:21 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Report
Doc Date
8/6/2003
Doc Name
1st Half 2003 Subsidence Monitoring 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 />1476 2900 Road <br />Hotchkiss, Colorado 81419 <br />Phone 970-872-2258 <br />Fax 970-872-3358 <br />May 29, 2003 <br />Bowie Resources Ltd. <br />Bowie No 2 mine <br />Paonia, Co. 81428 <br />Attn. Collin Stewart <br />RE: Bowie No. 2 Mine <br />Hubbard Creek Subsidence Survey <br />A subsidence monitoring 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 <br />in place around the Bowie No. 2 Mine surface facilities. The points for the subsidence survey <br />network have been established using a Trimble 4800 GPS survey system. This GPS survey <br />has been calibrated to the existing survey control grid and then the survey has been extended <br />to the north to cover the area where the coal has been mined and will be mined in the future. <br />The subsidence survey network was started in May of 1999 with additional points added in <br />August 1999, November of 2000 and November of 2001. The majority of the subsidence monitoring <br />points area # 5 rebar, 24 to 30 inches in length, with a 2 inch aluminum survey cap. <br />The caps are stamped: Cragg Surveying, LS 24944. <br />The survey stations along Hubbard Creek were surveyed again on May 23 of 2003. <br />The following 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 from the November 2002 survey to <br />the May, 2003 survey. Some of the points show small changes in position which may be due to inherent <br />error in the survey, while some of the points may show noticeable shift in position resulting from <br />subsidence due to the mining. There are some areas that show evidence of surface earthslides <br />due to natural geologic activity. <br />See the acxompanying map which shows the surface topography, underground mining plan, and the <br />location of the subsidence points. <br />
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