REP00169

• Permit No: C1996083
• IBM Index Class Name: Report
• Doc Date: 8/9/2004
• Doc Name: 1st Half 2004 Subsidence Report
• From: J.E. Stover & Associates
• To: DMG
• 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]
June 07, 2004
Bowie Resources LLC
Bowie No 2 mine
Paonia, Co. 81428
Attn. Collin Stewart
RE: Bowie No. 2 Mine
Subsidence Survey
May 2004
A subsidence monitoring survey network has been established by Cragg Surveying for the
Bowie Resources, Bowie No. 2 Mine. 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 points added in August 1999,
November 2000, November 2001, November 2002, and November, 2003. The majority of the
subsidence monitoring points area # 5 reber, 24 to 30 inches in length, with a 2 inch aluminum survey
cap. The caps are stamped: Cragg Surveying, LS 24944.
Subsidence stations up Hubbard Creek and stations over the west longwall panels Wat and WD-2 were
surveyed from May 24 to May 26 of 2004
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
For the points in Hubbard Creek the table shows the change from November, 2003 to May, 2004.
For the points over the west longwall panels, WD-1 and WD-2 the table shows the change from
November, 2002 to May, 2004.
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.