2008-09-15_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: REPORT
• Doc Date: 9/15/2008
• Doc Name: 2008 Annual Subsidence Report
• From: Oxbow Mining, LLC
• To: DRMS
• Permit Index Doc Type: Subsidence Report
• Email Name: MLT
• Media Type: D
• Archive: No

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OXBOW MINING, LLC
3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel [phone] Fax
[phone]
September 11, 2008 RECEIVED
Mr. Marcia Talvitie, P.E.
Environmental Protection Specialist SEP 15 2008
Colorado Division of Reclamation, Mining and Safety Division of Reclamation,
691 County Rd 233, Suite A-2
Durango, Colorado 81301 Mining and Safety
Re: Permit C-1981-022. Oxbow Mining. LLC.
2008 Annual Subsidence Report
Dear Ms Talvitie:
This subsidence monitoring report is submitted as required by Permit C-1981-022, PAP Section
2.05.6, page 2.05-104.
Summary - 2008 Subsidence Survey Results
Subsidence surveys were conducted during June and September, 2008. 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
Twice per year, typically June and October, Oxbow Mining LLC (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 lower, unnamed
drainage located between the Sanborn Creek and Coal Gulch drainages, and the landslide
located on the west valley slope of upper Hawksnest Creek drainage. 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 2008.
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 Hawk'snest Creek. Springs 7 through 11 are located along old
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