2015-10-14_REPORT - C1981022

• Permit No: C1981022
• IBM Index Class Name: Report
• Doc Date: 10/14/2015
• From: Oxbow Mining, LLC
• To: DRMS
• Annual Report Year: 2015
• Permit Index Doc Type: Subsidence Report
• Email Name: LDS
• Email Name: JRS
• Media Type: D
• Archive: No

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OXBOW MINING, LLC /_-N
3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel [phone] Fax
[phone]
October 8, 2015
RECEu��/ED
Mr. Leigh Simmons
Environmental Protection Specialist OCT 112015
Colorado Division of Reclamation, Mining and Safety Division1313 Sherman
D nver, CO 80 03 Street, Room 215 Mininofg & Sa e ytion,
Re: Permit C-1981-022, Oxbow Mining LLC.
2015 Annual Subsidence Report
Dear Mr. Simmons:
This subsidence monitoring report is submitted as required by CDRMS Permit C-1981-022, PAP Section
2.05.6, page 2.05-104.
Summary — 2015 Subsidence Survey Results
Subsidence surveys were conducted during June and October 2015. Subsidence inspections indicated that
1) signs of recent subsidence was non-existent 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. Mr. Doug Smith, Oxbow Chief Engineer, accompanied the undersigned on
the 2015 inspections. 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 2015.
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
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