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SubTerra, Inc. CYVCC-Foidel Creek Mine-Subsidence ... March 23, 1993 <br />1.3.1 Transverse Profile / <br />• The results of the analysis for survey line 12000E are shown in Tables 3 to 6 and Figures l to 7. <br />Inspection of Figure 1 (and Table 3) indicates a maximum subsidence, due to Panel No.l <br />excavation, of 38 inches. However, Monument 100 was offset 43 feet from the panel centerline <br />resulting in an actual maximum subsidence of 44 inches (corresponding to Monument 78 of <br />survey line 6LCL (see Table b). Panel l maximum subsidence subsequently increased to 54 inches <br />after Panel No.2 excavation and 57 inches after Panel 3 extraction. <br />Other key data obtained from an inspection of Tables 3 to 6 and Figures 1 to 7 includes: <br />o Subsidence over the rigid-yield pillar pair increased from 30 inches, after Panel <br />No.2 extraction to 36 inches after Panel No.3 extraction. <br />o Maximum subsidence for Panel No.2 is the same as for Panel No.l after Panel <br />No.3 extraction. <br />o Maximum slope of 14 x l0a after Panel No.3 extraction. <br />o Maximum transverse horizontal displacements of +5 and -10 inches after Panel <br />No.l extraction. <br />o Maximum strains of +.003 and -.006 after Panel No. 1 extraction. Maximum <br />compression located over Panel No.l centerline. Maximum extension iocated over <br />• Panel No.l rib. <br />o Maximum transverse horizontal displacements of +7 and -11 inches after Panel <br />No.2 extraction. <br />o Maximum strains of +.003 and -.005 after Panel No. 2 extraction. Maximum <br />compression zones Located over Panei No.l and Panel No.2 centerlines. Maximum <br />extension zones located over Panel No.l and Panel No.2 ribs. <br />o Maximum transverse horizontal displacements of +8 and ~ inches after Panel <br />No.3 extraction. <br />o Maximum strains of +.003 and -.005 after Panel No. 3 extraction. Maximum <br />compression zones located over Panel No.l and Panel No.2 centerlines. Maximum <br />extension zones located over Panel No.l and Panel No.2 ribs. <br />1.3.2 Start Profiles <br />1.3.2.1 Start Profile for Panel No.l -Survey Line 6LCL <br />The results of the analysis for survey line 6LCL are shown in Tables 7 to 9 and Figures 8 to 10. <br />Inspection of Figure 8 (and Table 7) indicates a maximum subsidence of 44 inches due to Panel <br />No.l extraction increasing to 53 inches for Panel No.2 and 57 inches for panel No.3 extractions. <br /> <br />4 <br />