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Elk Creek Mine Subsidence Page 44 February 26, 2003 <br />' PREDICTED LANDSLIDE SUBSIDENCE EFFECTS <br />• Figure 13 indicates the currently inactive landslide <br />identified by Junge (1978) that partially overlies Panel #1. No <br />other panels are overlain by identified landslides. The portion of <br />the potential landslide overlying Panel #1 will be subjected to <br />vertical subsidence and horizontal strain. <br />The vertical subsidence accompanying longwall mining of Panel <br />t #1 will lower the upper northern end of the landslide by slightly <br />more than 6-ft. The vertical subsidence accompanying longwall <br />mining of Panel #1 will decrease to zero toward the south, over a <br />' distance of approximately 1,500-ft. Lowering the upper part of a <br />landslide but not the lower part should increase the stability of <br />the landslide mass by tilting the upper roughly two-thirds of the <br />' landslide back into the slope. The overall slope of the 1,500-ft <br />of the affected upper part of the landslide will be flattened by <br />approximately 0.27° (-16 minutes). Flattening a landslide, even by <br />' a minor amount, decreases the thrust component tending to <br />reactivate and move the landslide and increases the frictional <br />resistance to sliding. The tilt toward the north will be a <br />permanent result of longwall mining Panel #1. <br />'• <br />-44- <br />