REP07050

• Permit No: C1982056
• IBM Index Class Name: Report
• Doc Date: 3/7/2005
• Doc Name: 2nd Half 2004 Subsidence Report Review Memo
• From: Byron Walker
• To: File
• Permit Index Doc Type: Subsidence Report
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
7313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
Inter-office Memorandum
to: File, 2004 2"d Half Subsidence Monitoring Report, C-1982-056
from: Byron G. Walker
cc: Dan Hernandez (e-mail)
subject: Review of 2"d Half 2004 Subsidence Monitoring Report, C-1982-056
date: March 7, 2005
COLORADO
DIVISION OF
MINERALS
GEOLOGY
REC~AMATION~MINING
SAFETY•SCIENCE
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Cottony
Division Director
Natural Resource Trustee
This monitoring report covers that period of time where a portion of the 16 Right panel of the
Northern Mining District was undermined [see Subsidence Map Second Half 2004 of the report
(2004 Map)]. In early July, mining was proceeding west in the 16 Right panel, and was
approximately 1000 feet past (west) of Fish Creek and 2,500 feet past the line of monitoring
stations along the railroad tracks.

Monitoring requirement
(regulation citation)
permit requirement In
compliance:
Comment
Yes / no ?
PAP, pages 2.05-
184.10and 2.05-191.4. Previous subsidence monitoring
Rule 2.05.6(6)(c)(i)(A) The requirement of this has demonstrated that subsidence
Monuments shall be rule has been limited to predictions were conservative and
installed and surveyed monitoring of selected Yes, by provided acceptable descriptions
prior to the structures and exception of expected subsidence. There
commencement of renewable resource were no selected structures
mining lands. See Rule undermined during this report
2.05.6(6)(c)(i)(C) period.
below.
Rule 2.05.6(6)(c)(i)(B) pAP, page 2.05-184.10.
Monuments shall be The requirement of this
situated to appropriately rule has been limited to
monitor ground surface monitoring of selected
movement, vertical and structures and Yes by There were no selected structures
horiaontal, within the renewable resource exception undermined during this report
area proposed to be lands as for the rule period.
undermined, including above
See Rule
an area to accommodate .
2.05.6(6)(c)(i)(C)
the predicted angle-of- below.
draw.
Rule 2.05.6(6)(c)(i)(C) PAP, pages 2.05-
The orientation, location 184.10 and 2.05-191.4, yes, by No selected structures were
and elevation of each and the 2004 Map.
exception
undermined.
structure within the Only those structures
ermit and adjacent within the ap roved
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geological Survey