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0 <br />OXBOW MINING, LLC <br />3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel (970)929-5122 Fax <br />(970)929-5177 <br />October 19, 2010 <br />Mr. Mike Boulay RECENVE® <br />Environmental Protection Specialist OCT 2 2 201o <br />Colorado Division of Reclamation, Mining and Safety Div?ron of <br />101 South 3 , Suite 301 REcr;,T"t?an <br />Grand Junction, CO. 81501 g W-rj wafaty <br />Re: Permit C-1981-022, Oxbow Mining LLC. <br />2010 Annual Subsidence Report <br />Dear Mr. Boulay: <br />This subsidence monitoring report is submitted as required by CDRMS Permit C-1981-022, PAP Section <br />2.05.6, page 2.05-104. <br />Summary - 2010 Subsidence Survey Results <br />Subsidence surveys were conducted during June and October 2010. Subsidence inspections indicated that <br />1) minimal signs of recent subsidence was apparent and inconsequential and 2) no new mass movement <br />of existing features were noted. <br />Discussion <br />Sanborn Creek Mine <br />Twice per year, typically June and October, Oxbow Mining LLC (OMLLC) is required to visually inspect <br />the pre-existing mass movement features located within the permit area in the vicinity of the Sanborn <br />Creek Mine Particular attention is to be focused upon the landslide located on the east valley slope of <br />Coal Gulch, the landslide features located within the lower, unnamed drainage located between the <br />Sanborn Creek and Coal Gulch drainages, and the landslide located on the west valley slope of upper <br />Hawksnest Creek drainage. If significant new mass movement features are noted, they are to be brought <br />to the attention of the Division. No new features were observed during 2010. <br />Back around Information <br />Mining in the Sanborn Creek Mine was completed in March 2003. During the initial years of the mine, a <br />visual subsidence-monitoring program had become part of the routine monitoring of Springs 1 through <br />11. Springs 1 through 6 are reached from the BLM/ U. S. Forest Service road located in the Coal Gulch <br />drainage. During trips to these springs from April to October, the higher elevations of the permit area for <br />the Sanborn Creek Mine and the Sanborn East Tract were visually inspected for mass movement features, <br />with particular attention focused on the landslides in Coal Gulch and Hawk'snest Creek. Springs 7 <br />through I 1 are located along old Highway 133 in the lower elevations of the permit area for the Sanborn <br />Creek Mine and the Sanborn East Tract. During monthly monitoring the lower elevations were visually <br />0 Page 1