REV96222

• Permit No: C1996083
• IBM Index Class Name: Revision
• Doc Date: 10/20/1997
• Doc Name: BOWIE 2 MINE TR 01 PORTAL BENCH REDESIGN PN C-96-083
• From: DMG
• To: JOE DUDASH
• Type & Sequence: TR1
• Media Type: D
• Archive: No

• • iii iiiiiiiiiiiii iii
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FA%:1303) 832-A106
DATE: October 20, 1997
TO: Joe Dudash
FROM: Jim Pendleton
II~I~ , `;
DEPARTMENT OF
NATURAL ..
RESOURCES -
Roy Ramer
Governor
lames 5. Lochhead
Executive Director
/ Michael B. Long
RE: Bowie No. 2 ine - T. O1 - Portal Hench Redesign Dnis~an Direc~ar
(P it No: C-96-083)
I have reviewed the geotechnical portions of the technical revision
application submitted by Bowie Resources, Ltd (BRL), which you
forwarded to my attention. TR-O1 was required by the Division as
abatement for an notice of violation issued to BRL.
BRL originally proposed to construct separate earthen benches to
accommodate the portal facilities and the coal stockpile. They
constructed one enlarged portal bench, occupying approximately the
intended footprint of the two designed benches. The technical
revision application includes a letter report prepared by MAXIM
Technologies, Inc., geotechnical consultant to BRL. MAXIM
completed a slope stability analysis of the modified larger portal
bench configuration. The analysis, using the material strength
characteristics earlier accepted by the Division as a portion of
the original application, projects a static slope safety factor of
between 1.5 and 1.8, depending on the degree of
compaction/consolidation.
I recommend that we accept
analysis as a demonstration
Bowie No. 2 is stable.
cc: Dave Berry
doc: M:\Coal\JAP\BRLTROI,WPS
MAXIM Technologies slope stability
that the modified portal bench at the
JP/Jp