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SENT BY~Administration Office:9- 9-92 2~37PM :CYPRUS Y.4MPA V~EY yC0 MINED LAND REC'L :# 2 <br />T <br />SUBSIDENCE SURVEY REPORT <br />January -June 1992 <br />Twentymile Caal Company, Foldel Creek Mine <br />This report summarizes the results of the subsidence monitoring program at the Foldel Creak Mine of <br />the Twentymlle Coal Company. Surface subsidence has sffacdvely ceased for all monitoring points. <br />1.0 SURVEY DATA <br />The attached table summarlies the resutta of the quarterly monitoring surveys. Because of a <br />mlaunderetending with the surveyor, the A-series points ware not surveyed during Juna 1 gD2. The <br />omission of the June 1®fa2 survey Is not considered Critical because previous surveys Indicate that <br />subsidence has ceased along the A~erlea Ene. These Pointe will 6e surveyed In September 1®82. <br />2.0 MAP AND PROFILES <br />Mep 1 Is a plan view of the mining area showing the monument locatlans. The map Illustretes mining <br />advance, by month, for this reporting period. Projected minlhg for the second halt of 1992 is shown. <br />The map presents the surface topography end structures with In the subsidence area. <br />Profiles era attached for both the A-series and 8aerla monRoring Gnea. These profiles Illustrete total, <br />measured subsidence. <br />8.0 STRUCTURES <br />visual Inspection of the monitoring polrNa and the current, actlvs, subsidence area were conducted In <br />June 1992. There is no visible surface evidence of subsidence or subsidence impacts. <br />4.0 CONCLUSIONS <br />5urfece movement In the monitored area has tossed, No further subsidence la antlclpatad, However, <br />monitoring will continue uhtil a technical revision has been prepared end approved, <br />There Is no surface Indication o1 subsidence or subsidence effects In the current mining area, No <br />negative Impacts of subsidence have been noted. <br /> <br />