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permanently the amount of moisture introduced into the subsurface <br />• from surface runoff. However, due to reasons explained later in <br />this report and as a result of proposed changes in the mine plan, <br />it is felt that the potential for the development of chimney <br />subsidence on this particular site is minimal. Therefore, <br />assuming all subsidence to be trough subsidence we would <br />anticipate no grade reversals or any permanent changes in surface <br />drainage on the very steep slopes present on-site. <br />From a site-specific point of view, the effects of subsidence on <br />this particular site with regard to existing or future <br />instability are felt to be minor. Many of the existing <br />instability features are flow slides fed by shallow, surficial <br />• slumping which will be affected minimally by the anticipated <br /> subsidence. The toe areas of major slides will be unaffected by <br />subsidence (i.e., all subsidence occurs well up the slope beneath <br />the body of the slides rather than in the toe "buttress" area). <br />Although rubblization of the rock above the immediate mine roof <br />does affect shear strength, the changes in shear strength do not <br />appear to be sufficient to initiate large, deep-seated failures <br />within the bedrock. Much more specific information will be <br />provided in the body of this report along with a description of <br />the assumptions and limitations of this study. <br />• <br />2 <br />