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• • ~ III IIIIIIIIIIIIIIII <br />999 <br />xeow <br />Sanborn Creek Mine <br />November 5, lsss RECEIVED <br />William J. Carter N~V 12 <br />Environmental Protection Specialist <br />State of Colorado <br />Division of Minerals and Geology p'~'~~~na~MinpralpG©tltll0gy <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: 1996 Annual Subsidence Report <br />Permit C-81-022 <br />Dear Mr. Carter: <br />This subsidence monitoring report is submitted as required by <br />permit section 2.05.6(6)(c)(i), page 2.05-61i. <br />The Operator is to visually inspect the permit area for the Sanborn <br />Creek Mine and the Sanborn East Tract for mass movement features in <br />June and November of each year. Particular attention is to be <br />focused upon the modern landslide on the east valley slope of Coal <br />Gulch, the landslide features within the unnamed drainage between <br />the Sanborn Creek and Coal Gulch drainage and the modern landslide <br />on the west valley slope of Hawksnest Creek. If new mass movement <br />features are noted, they are to be brought to the attention of the <br />Division. <br />The June visual inspection was performed beginning on May 20, 1996 <br />during spring monitoring in the upper Coal Gulch area. The <br />landslide feature had been releasing minor rock fall debris onto <br />the trail below the slide during the spring run-off. Upper scarp <br />markings were evident, but no indication of recent mass movement <br />was based on appearance of soil and vegetation in the bottom of the <br />scarp trenches and along the toe of the slide. The rock fall <br />debris was cleared from the trail during the summer. <br />The permit area along the ridge above the active workings in <br />Section 10 was observed for any new mass movement features. The <br />eastern permit area in Sections 1 and 2, along with the landslide <br />feature in Hawksnest Creek drainage was also inspected. <br />On June 5, the southern permit area along the highway in Sections <br />9, 10, 11, and 12, along with the landslide feature in the unnamed <br />drainage were inspected. No new mass movement features were noted <br />in any of the areas inspected. <br />The November visual inspection was performed beginning o:i October <br />1, in conjunction with the final spring monitoring tour to the <br />higher elevations in the upper Coal Gulch area. The modern <br />landslide areas in Coal Gulch and Hawksnest Creek, as well as the <br />P. O. B o x 5 3 5 S o m e r s e t, C o l o r a d o 8 1 4 3 4 U S A <br />TEL (970)929-5122 FAX (970)929-5177 <br />