2012-10-11_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: REPORT
• Doc Date: 10/11/2012
• Doc Name: 2012 Annual Subsidence Subsidence Report
• From: Oxbow Mining, LLC
• To: DRMS
• Permit Index Doc Type: Subsidence Report
• Email Name: BFB
• Email Name: SB1
• 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
(970)929 -5177
October 5, 2012
Mr. Brock Bowles
Environmental Protection Specialist
Colorado Division of Reclamation, Mining and Safety
1313 Sherman Street, Room 215
Denver, CO 80203
RECEI
OCT 112012
D ivision of Fo lamatioh
Munm9 & Safe
Re: Permit C- 1981 -022, Oxbow Mining, LLC.
2012 Annual Subsidence Report
Dear Mr. Bowles:
This subsidence monitoring report is submitted as required by CDRMS Permit C- 1981 -022, PAP Section
2.05.6, page 2.05 -104.
Subsidence surveys were conducted during June and October 2012. Subsidence inspections indicated that
1) signs of recent subsidence was non - existent and 2) no new mass movement of existing features were
noted.
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 2012.
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.
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Summary — 2012 Subsidence Survey Results
Discussion
Background Information