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• • 1111111111111111111 xeow Sanborn Creek Mine November 24, 1997 William J. Carter Environmental Protection Specialist State of Colorado Division of Minerals and Geology 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: 1997 Armual Subsidence Report Dear Mr. Carter: RFGEI\iED UEC 0 ~ 1997 This subsidence monitoring report is submitted as required by permit section 2.05.6(6xcxi), page 2.05-61i. The Operator is to visually inspect the permit area for the Sanborn Creek Mine and the Sanborn East Tract for mass movement features in June and November of each year. Particulaz attention is to be focused upon the modem landslide on the east valley slope of Coal Gulch, the landslide features within the unnamed drainage between the Sanborn Creek and Coal Gulch drainages, and the modern landslide on the west valley slope of Hawksnest Creek If new mass movement features are noted, they are to be brought to the attemion of the Division. During the past four years, a visual subsidence monitoring program has become part of the routine monitoring of Springs 1 through 1 t. Springs 1 through 6 aze reached from the U. S. Forest Service road up Coal Gulch 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 are visually inspected for mass movement features, with particular attention focused on the landslides in Coal Gulch and Hawksnest Creek. Springs 7 through I 1 are along old Highway 133 in the -ower elevations of the permit azea for the Sanborn Creek Mine and the Sanborn East Tract During montlily monitoring the lower elevations are 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. During 1995 and 1996 the area in the lower elevations of Coal Gulch were mined in the vicinity of the Coal Gulch slide. There has been no indication of recent mass movement in the landslide as a result of the mining. Mining under the ridge in Section 10 between Coal Gulch and the unnamed drainage was completed in 1996, with no indication of differential settlement in the massive sandstone beds that can be readily observed from the Coal Gulch road. During 1997 the azea in the vicinity of the landslide features in the unnamed drainage was mined, again with no indication of recent mass movement in the landslide as a result of the mining. P. O. Box 5 3 5 Somerset , C o l o r a tl o 9 7 4 3 4 U S A TEL (9 7 0) 9 2 9- 5 1 2 2 FAX (9 7 0) 9 2 9- 5 1 7 7