REP01217

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 10/12/2004
• Doc Name: 2004 Annual Subsidence Report
• From: Oxbow Mining, LLC
• To: DMG
• Permit Index Doc Type: Subsidence Report
• Media Type: D
• Archive: No

,.-

October 5, 2004
Mr. Jim Burnell
Environmental Protection Specialist
Colorado Division of Minerals and Geology
1313 Sherman Street, Room 215
Denver. Colorado 80203
RECEIVED
OCT 12 2004
Division of Minerals 8 Geology
Re: Permit C-1981-022. Oxbow Mining. L.L.C.
2004 Annual Subsidence Report
Dear Mr. Burnell:
This subsidence monitoring report is submitted as required by Permit C-1981-022, PAP
Section 2.05.6, page 2.05-104.
Summary-2004 Subsidence Survev Results
Subsidence surveys conducted during the June and October, 2004 subsidence inspections
indicated that 1) minimal signs of recent subsidence was apparent and inconsequential and 2)
no new mass movement of existing features were noted.
Discussion
Sanborn Creek Mine
During June and October of each year, Oxbow Mining L.L.C. (OMLLC) is required to visually
inspect the pre-existing mass movement features located within the permit area in the vicinity
of the Sanborn Creek mine Particular attention is to be focused upon the landslide located on
the east valley slope of Coal Gulch, the landslide features located within the unnamed drainage
between the Sanborn Creek and Coal Gulch drainages, and the landslide located on the west
valley slope of Hawksnest Creek. If significant new mass movement features are noted, they
are to be brought to the attention of the Division. No new features were observed during 2004.
Background Information
Mining in the Sanborn Creek Mine was completed in March 2003. During the initial years of the
mine, a visual subsidence-monitoring program had become part of the routine monitoring of
Springs 1 through 11. Springs 1 through 6 are reached from the BLM/ U. S. Forest Service
road located in the Coal Gulch drainage. During trips to these springs from April to October,
the higher elevations of the permit area for the Sanborn Creek Mine and the Sanborn East
Tract were visually inspected for mass movement features, with particular attention focused on
the landslides in Coal Gulch and Hawksnest Creek. Springs 7 through 11 are located along
old Highway 133 in the lower elevations of the permit area for the Sanborn Creek Mine and the
Sanborn East Tract. During monthly monitoring the lower elevations were visually inspected
for mass movement features, with particular attention focused on the landslides in Coal Gulch
and the unnamed drainage between the Sanborn Creek and Coal Gulch drainages, above
Springs 7 and 9 respectively.
3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA
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