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a.{ <br />~; <br /> <br />MainCressonSlopeEvaluation Adrian6rown <br />Table 7. Slope Movement Rate Signibcance <br />Rate Significance <br />0 - 0.01 in/day Normal elastic expansion movement in large mine <br />0.01-0.1 in/day Elastic/plastic movement typical of active mining <br />0.1-1 in/day Possible indicator of slope weakening and incipient failure <br />> 1 inch/day Precursor of imminent failure <br />• <br />• <br />Based on these results, there is little evidence of significant slope movement in the Main Cresson Nine, in <br />particular on the East Wall of the South Mine, which. is the highest and steepest of the slopes at present. <br />This data suggests that the current mine walls (particularly the east wall) are stable at the current <br />excavated slope. This in turn suggests that the slope angle could be increased in critical areas. <br />1385D.980612 34 <br />