2009-09-09_REVISION - C1996083

• Permit No: C1996083
• IBM Index Class Name: REVISION
• Doc Date: 9/9/2009
• Doc Name: Adequacy Review Memo
• From: Jim Stark
• To: Joe Dudash
• Type & Sequence: TR64
• Email Name: JJD
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
INTEROFFICE
MEMORANDUM
TO: Joe Dudash
FROM: Jim Star ??
SUBJECT: TR-64 Adequacy Review
DATE: 9 September 2009
COLORADO
D IV IS I ON OF
RECLAMATION
MINING
SAFETY
Bill Ritter, Jr.
Governor
Harris D. Sherman
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
On 18 August 2009 you requested a review of bond liability for the Bowie No. 2 Mine's
Technical Revision 64 - increase in the height of waste pile #4. I have several adequacy
questions based upon my review of the material provided. The answers to some of these
questions will be necessary before the cost estimate can be completed. My questions are
as follows:
The operator is proposing to increase the size Gob Pile #4 by increasing its
maximum height, lowering the elevation where it starts and increasing its acreage.
Based on cross-section D-D', the maximum height of the pile is being increased
from 6,230' to 6,235' and the starting elevation of the pile is being decreased
from 6,110' to 6,080'. As a result of these elevation changes, the area of the pile
is being expanded to the north and the south. Based on the Division's digitizing,
the area of Gob Piles #1 and #4 (taken together because they converge) increased
from 10.3 acres to 11.3 acres. The increases in area extend into what appears to
be undisturbed lands both above and below Gob Pile #4. BRL has not included
any detail regarding the topsoil and subsoil stripping that will be required in this
undisturbed area. Detailed information regarding the increased area and the
volumes of topsoil and subsoil that will need to be salvaged will be required.
2. Based on the increases maximum elevation, starting elevation and area noted in
question 1 above and the increase in capacity of Gob Pile #4 (from 300,000 cubic
yards to 450,000 cubic yards; Volume IX, Page 4) the surface area of the pile will
necessarily increase. This increase in area will require additional subsoil and
topsoil to properly cover the pile. Please recalculate the volumes of subsoil and
topsoil that will be required to cover the pile with the required depth (three feet of
subsoil and one foot of topsoil).
3. Based on the Division's digitized areas of Gob Piles #1 and #4, which have
increased by approximately 1 acre, the operator's description of the disturbance in
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines