REP28331

• Permit No: C1996083
• IBM Index Class Name: Report
• Doc Date: 4/18/2007
• Doc Name: 2006 Bi-Annual Subsidence Report
• From: J.E. Stover & Associates Inc
• To: DRMS
• Permit Index Doc Type: Subsidence Report
• Media Type: D
• Archive: No

CRAGG SURVEYING
Stephen B. Cragg PLS
14762 2900 Road
• Hotchkiss, Colorado 81419
Phone [phone]
Fax [phone]
May 31, 2006
Collin Stewart
Bowie Resources LLC
P.O. Box 1488
Paonia, Co. 81428
Jim Stover
J.E. Stover and Associates
P.O. Box 60340
Grand Junction, Colorado 81506
RE: Bowie No. 2 and No. 3 Mines
Subsidence Survey
May 10-15, 2006
A subsidence monitoring survey network has been established by Cragg Surveying for the
Bowie Resources, Bowie No. 2 and 3 Mines. The survey is based on the existing survey control grid in
place around the Bowie No. 2 Mine surface facilities. The points for the subsidence survey network have
been established using a Trimble 4800 GPS survey system. This GPS survey has been calibrated to
• the existing survey control grid and then the survey has been extended to the north to cover the area
where the coal has been mined and will be mined in the future.
The subsidence survey network was started in May of 1999 with additional poirrts added in August 1999,
November 2000, November 2001, November 2002, and November, 2003. The majority of the
subsidence monitoring points area # 5 rebar, 24 to 30 inches in length, with a 2 inch aluminum
survey cap. The pps are stamped: Cragg Surveying, LS 24944.
New subsidence stations over the west longwali panels WD-1, WD-2 and WD3 of the Bowie No.2 Mine
and the west IongwaI1 panels B-1, B-2 and B-3 of the Bowie No.3 Mine were established and surveyed
from December~,D5,lto December 14 of 2005. These new subsidence monitoring points are # 5 and # 6
rebar with no aWrFiinum survey cap on top.
Subsidence stations over the west longwall panels WD-1, WD-2 and WD-3 of the Bowie No.2 Mine
and the west longwall panels B-1, B-2 and B-3 of the Bowie No.3 Mine were surveyed from
May 10 to May 12 of 2006. Hubbard Creek stations were surveyed on May 15.
The following tables list the survey points with the coordinate data, northing, Basting and elevation for
each point along with a table showing the relative shift in position from the previous survey.
Some of the points show small changes in position which may be due to inherent error in the survey,
while some of the points show noticeable shift in position resulting from subsidence due to the mining.
See the accompanying map which shows the surface topography, underground mining plan, and the
location of the subsidence points.

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