REV01966

• Permit No: C1996083
• IBM Index Class Name: Revision
• Doc Date: 1/5/2004
• Doc Name: Adequacy Letter
• From: DMG
• To: Bowie Resources Limited
• Type & Sequence: TR31
• Media Type: D
• Archive: No

Recent Rockfall
The Division believes that the recent rockfall east of D-seam longwall panel D-9 has significance
for any longwall mining near rock cliffs at the Bowie No. 2 Mine. This includes the extension of
D-seam longwall panel WD3 that is proposed in TR-31 since it appeazs that rock cliffs maybe
affected by subsidence effects from this panel extension. Therefore, the Division has the
following questions concerning rockfalls as they relate directly or indirectly to TR-31.
6. Recognizing the recent rockfall on the Hubbard Creek Road just south of the junction
with Dove Gulch, please validate that the surface subsidence feature is within the Extent
of Subsidence Based on Mine Plan line, and include the rock run-out azea within the
Affected Area line.
Concerning the recent rockfall, please add to the Worst Case Damage description on page
43, Volume III, Exhibit 15, a description of potential rockfall damage and add rockfall to
the warning sign (page 44).
8. The Division requests that BRL provide whatever subsidence monitoring information is
available for the azea azound the rockfall. Referring to Map 27, this would include any
data from subsidence monitoring points 17-A, 17-B, 17-C, 17-D, 23-A, 23-B and 23-C.
9. The Division received a letter dated December 8, 2003 from the Paonia Ranger District of
the U.S.D.A.-Forest Service concerning the recent rockfall that was reported by BRL. Jim
Stover, BRL's consultant, was copied on the letter. The rock fall is on Forest Service
land, near the intersection of Dove Creek and Hubbard Creek. In the letter, the Forest
Service stated that the rockfall blocked a section of the Hubbazd Canyon road and
probably occurred as a result of subsidence from the Bowie No. 2 Mine. Along with the
Forest Service's requirement to put up warning signs now, the letter also states that BRL
has agreed to perform the necessary repair work, perhaps in the Spring of 2004.
Rule 4.20.3 requires that mitigation actions be taken to protect the surface owner from
any reduction in the value or use of the surface lands. The Division requests that BRL
submit a repair plan to the Division concerning this recent rockfall. The repair plan
should include a schedule of proposed actions and a tentative time schedule. If blasting is
to occur, please review the blasting regulations concerning possible notification and
record keeping requirements.
10. The recent rockfall is evidence that rockfalls can be expected from outcrops in steep
terrain as a result of subsidence. Therefore, certain requirements of Rule 2.05.6 apply.
A. Under Rule 2.05.6(6)((e)(i)(F)(IV), the areas subject to rockfall nmout should be
identified on an appropriate map and described in the permit application text, such
runouts being a related phenomena.
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