Laserfiche WebLink
-- <br />~ ~ III IIIIIIIIIIIII III <br />December 1. 1998 <br />William J. Carter <br />Environmental Protection Specialist <br />State of Colorado <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 2 ] 5 <br />Denver, Colorado 80203 <br />'-~E!\/ED <br />,, <br />~ ~r .c <br />~,~ „~ .t:~nerais ~ Geology <br />Re: 1998 Annual Subsidence Report <br />Dear Mr. Carter: <br />This subsidence monitoring report is submitted as required by permit section 2.05.6(6)(c)(i), page <br />2.05-61 i. <br />The Operator is to visually inspect the permit area for the Sanbom Creek Mine and the Sanbom East <br />Tract for mass movement features in June and November of each yeaz. Particular attention is to be <br />focused upon the modem landslide on the east valley slope of Coal Gulch, the landslide features <br />within the unnamed drainage between the Sanbom Creek and Coal Gulch drainages, and the modem <br />landslide on the west valley slope of Hawksnest Creek. If new mass movement features are noted, <br />they are to be brought to the attention of the Division. <br />During the past five years, a visual subsidence-monitoring program has become part of the routine <br />monitoring of Springs ]through 11. Springs 1 through 6 are reached from the U. S. Forest Service <br />road up Coal Gulch. During trips to these springs from April to October, the higher elevations of the <br />permit area for the Sanbom Creek Mine and the Sanbom East Tract are visually inspected for mass <br />movement features, with particular attention focused on the landslides in Coal Gulch and Hawksnest <br />Creek. Springs 7 through 11 aze along old Highway 133 in the lower elevations of the permit area <br />for the Sanbom Creek Mine and the Sanbom East Tract. During monthly monitoring the lower <br />elevations are visually inspected for mass movement features, with particular attention focused on <br />the landslides in Coal Gulch and the unnamed drainage between the Sanbom Creek and Coal Gulch <br />drainages, above Springs 7 and 9 respectively. <br />During 1995 and 1996 the area in the lower elevations of Coal Gulch were mined in the vicinity of <br />the Coal Gulch slide. There has been no indication of recent mass movement in the landslide as a <br />result of the mining. Mining under the ridge in Section 10 between Coal Gulch and the unnamed <br />drainage was completed in 1996, with no indication of differential settlement in the massive <br />sandstone beds that can be readily observed from the Coal Gulch road. During 1997 the area in the <br />vicinity ofthe landslide features in the unnamed drainage was mined, again with no indication of <br />recent mass movement in the landslide as a result of the mining. <br />P. O. Box 5 3 5 3 7 3 7 Highway 1 3 3 Somerset , C o l o r a d o 8 1 4 3 4 U S A <br />TEL (970) 929-5122 FAX (970) 929-St77 <br />