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• • The remaining mass of old landslide deposits is stable under current conditions. <br />• Smaller scale active landslide movements are occurring on steeper parts of the old <br />landslide mass. These movements are relatively slow. <br />• Longwall mining beneath the Jumbo Mountain landslide is highly unlikely to cause <br />the resumption of deep-seated movement of the old landslide mass. <br />• Mining is also unlikely to increase the incidence or rate of movement of the smaller <br />scale active landslides. These movements aze likely to continue with or without <br />mining, particulazly during spring snowmelt. <br />• Subsidence will lead to surface cracking which may be difficult to distinguish from <br />cracking due to landslide movement. <br />' • Neither the large ancient landslide movements or the current small-scale movements <br />will potentially affect the successful development of a longwall mining panel as <br />currently proposed. <br />If mining proceeds, it is recommended that inclinometers be installed in two borings to the north <br />of the northern limit of mining. These should not be positioned in areas of current instability. <br />They should terminate below the 'B' seam. It is also recommended that two piezometers be <br />installed to the north of the proposed mine at the inclinometer locations and two piezometers <br />• should be installed to the south of the mine. These instruments should be sited once the location <br />of the mine has been confirmed. <br /> <br />-14- <br />0:\Off\30\JPT V~RCO-Rpc.lkl <br />