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i~ <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 9, 2006 <br />Mr. Jim Stark <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology ;~~C~9VEp <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 OCT 12 2006 <br />Re: Permit C-1981-022. Oxbow Mining, LLC Divisio.~ of Reclamation, <br />2006 Annual Subsidence Resort mi+n+ny -nd Safety . <br />Dear Mr. Stark: <br />This subsidence monitoring report is submitted as required by Permit C-1981-022, PAP Section <br />2.05.6, page 2.05-104. <br />Summary - 2006 Subsidence Survev Results <br />Subsidence surveys conducted during the June and October, 2006 subsidence inspections <br />indicated that 1) minimal signs of recent subsidence was apparent and inconsequential and 2) <br />no new mass movement of existing features were noted. <br />Discussion <br />Sanborn Creek Mine <br />During June and October of each year, Oxbow Mining LLC (OMLLC) is required to visually <br />inspect the pre-existing mass movement features located within the permit area in the vicinity of <br />the Sanbom Creek Mine Particular attention is to be focused upon the landslide located on the <br />east valley slope of Coal Gulch, the landslide features located within the unnamed drainage <br />between the Sanbom Creek and Coal Gulch drainages, and the landslide located on the west <br />valley slope of Hawksnest Creek. If significant new mass movement features are noted, they <br />are to be brought to the attention of the Division. No new features were observed during 2006. <br />Background Information <br />Mining in the Sanbom Creek Mine was completed in March 2003. During the initial years of the <br />mine, a visual subsidence-monitoring program had become part of the routine monitoring of <br />Springs 1 through 11. Springs 1 through 6 are reached from the BLM/ U. S. Forest Service road <br />located in the Coal Gulch drainage. During trips to these springs from April to October, the <br />higher elevations of the permit area for the Sanbom Creek Mine and the Sanbom East Tract <br />were visually inspected for mass movement features, with particular attention focused on the <br />landslides in Coal Gulch and Hawksnest Creek. Springs 7 through 11 are located along old <br />Highway 133 in the lower elevations of the permit area for the Sanbom Creek Mine and the <br />Sanbom East Tract. During monthly monitoring the lower elevations were visually inspected for <br />• Page 1 <br />