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J.~. STOVER & ASSOC~TES 2768 COMPASS DRIVE, SUITE 101 GRAND JUNCTION, COLORADO 81506 PHONE: (303) 245-4101, FA% 242-7908 MINE ENGINEERING MINE RECLAMATION iiiiiiiiiiiiiiiiiii 999 CIVIL ENGINEERING CONSTRUCTION MANAGEMENT January 31, 1994 S. S. Shuey Division of Minerals and Geology 1313 Sherman St., Room 215 Denver, CO 80203 Re: Somerset Mining Company 1993 Subsidence Annual Report Permit C-81-022 ~~~ .~ ,coq Dear Mr. Shuey: This subsidence monitoring report is submitted by Somerset Mining Company as required by permit section 2.05.6(6)(c)(i), page 2.05- 611. ' 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. Particular attention is to be focused upon the modern 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 attention of the Division. The June visual inspection was performed by Bill Percharich concurrently with spring monitoring requirements on July 2, 1993. The November visual inspection was performed by Kirt Jewkes on November 19, 1993. No new mass movement features were noted. No pictures were taken of the area. The cut slopes on the Coal Gulch access road did slough after the spring thaw. In one area the cut slope failed enough to block vehicular traffic. The road was reopened during the year. The cut slope failures do not appear to be associated with any major landslide features. Enclosed is a portion of the Geologic Hazards Map, Drawing C8-1227- A, with the current Sanborn Creek Mine workings shown on the map. It can be seen from this map that the modern landslide feature located on the east valley slope of Coal Gulch and the landslide feature in the unnamed drainage have both been mined under.