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41�' <br />400*e*.a��� <br />OXBOW MINING, LLC <br />3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA Tel (970)929-5122 Fax (970)929-5177 <br />October 17, 2016 <br />Mr. Leigh Simmons <br />Environmental Protection Specialist RECEIVED <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 OCT E 12016 <br />Denver, CO 80203 <br />Division of .1'," amation, <br />Re: Permit C-1981-022, Oxbow Mining LLC. k4io n9 & Safety <br />2016 Annual Subsidence Report <br />Dear Mr. Simmons: <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 />Summar- 2016 Subsidence Survey Results <br />Subsidence surveys were conducted during June and October 2016. Subsidence inspections indicated that <br />1) signs of recent subsidence was non-existent and 2) no new mass movement of existing features were <br />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 2016. <br />Background 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 Hawksnest Creek. Springs 7 <br />through 11 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 />inspected for mass movement features, with particular attention focused on the landslides in Coal Gulch <br />and the unnamed drainage between the Sanborn Creek and Coal Gulch drainages, above Springs 7 and 9 <br />respectively. <br />0 Page 1 <br />