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r,~ <br />III IIIIIIIIIIIIIIII <br />9~ <br />SUBSIDENCE MONITORING REPORT <br />JULY -DECEMBER 1994 <br />CYPRUS EMPIRE CORPORATION <br />1.0 INTRODUCTION <br />This report summarizes the survey results of subsidence monitoring lines over <br />longwall panels in the E seam and 3 State Highway 13 points. Longwall mining <br />began in 3 East panel in August 1993. The increment of mining for this reporting <br />period is marked on the attached map. The map shows overburden thickness, <br />surface features and the lines/monitoring point labels. <br />2.0 MONITORING SCHEDULE <br />Surveys were done on schedule on 17Sep94 for linesA,B,C and D, 30Sep94 for <br />line J, 25Nov94 for lines A,B and C, 28Nov94 for line D and 30Nov94 for line J. <br />Highway point surveying schedule is listed below. <br />3.0 MINING ADVANCE <br />The advance of the longwall marked on the map totalled 978 ft linear down the <br />longitudinal axis of the longwall panel. The highway points have already been <br />undermined prior to this reporting period. <br />4.0 SUBSIDENCE RESULTS <br />The results of the line surveys are presented in the attached tables. Because of <br />inherent ground swell from temperature and moisture variations and surveying <br />accuracy, change of elevation of less than 0.1 ft is not significant. Listed below <br />are the highlights of each monument line for the E seam panels and for the <br />highway points. <br />LINE MAXIMUM TOTAL <br />SUBSIDENCE TODATE <br />A -7.4 FT <br />B -7.5 FT <br />C -5.1 FT <br />MAXIMUM SUBSIDENCE <br />IN LAST 6 MONTHS <br />-0.1 FT <br />-4.3 FT <br />-0.4 FT <br />