REP31194 - Laserfiche WebLink

Home Browse Search

LLC October 13, 2005 Mr. Jim Stark Environmental Protection Specialist Colorado Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: Permit C-1981-022. Oxbow Mining. L.L.C. 2005 Annual Subsidence Report Dear Mr. Stark: REGc)'~!t'~ O C T 17 2005 ,. Division of o1iner2ls & Geology This subsidence monitoring report is submitted as required by Permit C-1981-022, PAP Section 2.05.6, page 2.05-104. Summary - 2005 Subsidence Survey Results Subsidence surveys conducted during the June and October, 2005 subsidence inspections indicated that 1) minimal signs of recent subsidence was apparent and inconsequential and 2) no new mass movement of existing features were noted. Discussion Sanborn Creek Mine During June and October of each year, Oxbow Mining L.L.C. (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 unnamed drainage between the Sanborn Creek and Coal Gulch drainages, and the landslide located on the west valley slope of Hawksnest Creek. 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 2005. Backoround 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 and the unnamed drainage between the Sanborn Creek and Coal Gulch drainages, above Springs 7 and 9 respectively. 3737 Hwy 133 P.O. Box 535 Somerset, Colorado 81434 USA TEL (970) 929-5122 FAX (970) 929-5177