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^ Memorandum to Kathy Welt <br />A owst 28, 1997 <br />Page 5 <br />Though the slide this spring at Muffler Rock was roughly coincident with the movement of <br />the Panel 9 IongwaIl face beneath it, it is unlikely that the mining influenced the slide <br />movement significantly. The Mesaverde sandstone and overlying sur£ciai material moved <br />northwazd during the slide; the Panel 9 longwall face moved eastward. Any tilt, curvature, <br />and strain produced by Iongwall mining (and attendant subsidence) would be ma~cimum in <br />the east-west direction and minimum (or perhaps zero) in the north-south direction. <br />Therefore, I believe that the predominant cause of the slide at Muffler Rock this spring <br />(1997) was the saturated conditions of the material and the aorthwazd dip of the bedrock <br />(about 5 degrees) towards the currently e:tisting Muffler Rock landslide scarp. <br />References <br />Dunrud, C. Richard. 1989. Geologic Map and Coal Stratigraphic Framework of the Paonia <br />Area, Delta and Gunnison Counties, Colorado. Coal Investigations Map C-115 (2 <br />sheets). <br />cc: Jon Jones, WWE <br />C:1831-032U80ardVumbo Mfi.doc <br />