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<br />William J. Carter November 5, 1996 <br />Re: 1996 Annual Subsidence Report <br />ridge line in Section 10 above the pillar sections, received <br />particular attention on October 1. The old road along the ridge <br />was traveled by ATV, and on foot, from the junction with the Coal <br />Gulch Trail in Section 3 to the high point between Sanborn Creek <br />and the unnamed drainage in the center of Section 9. <br />A recent rockslide was observed at the very top of the unnamed <br />drainage. The rockslide had taken another portion of the old, pre- <br />law road out, resulting in blocking the road to even ATV travel. <br />Upon returning to the office, the location of the rockslide was <br />plotted onto a topography map, with the mine workings shown, copy <br />enclosed. Pillars were pulled below the location of the rockslide <br />during January of 1995. <br />Since the old road had been traveled during the inspection earlier <br />in the year, the rockslide occurred sometime during the period from <br />May 20 to October 1. Mining during that period was occurring in <br />Section 10, approximately one-half mile from the rockslide. The <br />depth of overburden between the rockslide and the mine is more than <br />2,000 feet. <br />Based on that information, it is unlikely the rockslide was <br />directly related to mining activity, and could as probably be the <br />result of naturally occurring rock failure and rockslide activity <br />common to this area. The old road has been little more than a <br />trail in recent years, due to rockfall debris deposited on the road <br />prior to any mining activity at the Sanborn Creek Mine. <br />Even though the old road was damaged by the rockslide, the road is <br />not used by the Sanborn Creek Mine. The old road is located on <br />private property owned by Oxbow Carbon and Minerals, Inc. Oxbow <br />Carbon and Minerals, Inc., Sanborn Creek Mine, does not plan to <br />repair the damage to the old road. <br />The landslide feature in the unnamed drainage and the southern <br />permit area above the Mains in lower cover from Sanborn Creek to <br />the east were inspected during an inspection on November 5. No <br />visible indication of recent mass movement was apparent and no new <br />mass movement features were noted during the inspection. <br />Please call if there are any questions. <br />Sincerely, ~/_~!~` <br />Thomas C. Anderson, P.E. <br />Environmental Coordinator <br />XBOW 2 <br />