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14 - <br /> Point No. : MC-6 <br /> Type : monitoring <br /> Installed: 1981 Surveyed: 1982 , 83 , 7/84 , 9/84 , 8/85 <br /> Location (mine coordinate system) : 16550 . 98N, 4175 . 36E <br /> Original Elevation (ft) : 10,448 .13 <br /> Total Movement Since Installation (ft) : -0 .48 <br /> Estimated Coal Removed Within Subsidence Zone (ft) : 8 . 00 <br /> Subsidence Ratio : 0. 06 <br /> Location Relative to Mine Workings : over 3 North No. 3 mine; <br /> 890 ft NW of lw 205 , No. 2 mine. <br /> Discussion: this part of 3 North apparently pillared early <br /> 1970 ' s; probably in subsidence zone of more recent 2 North- <br /> 3 North pillaring, 1979-1980 . See Figure 11 . <br /> Point No. : MC-7 <br /> Type : monitoring <br /> Installed: 1981 Surveyed: 1982 , 1983 <br /> Location (mine coordinate system) : 20252 . 64N, 2497 .51E <br /> Original Elevation (ft) : 11 , 012 . 54 <br /> Total Movement Since Installation (ft) : +0 . 01 <br /> Estimated Coal Removed Within Subsidence Zone (ft) : 10. 00 <br /> Subsidence ratio : less than 0 . 01 (not surveyed after 1983) <br /> Location Relative to Mine Workings : over 4 North No. 5 mine, <br /> 250 ft SE of pillared area , 4-5 North. <br /> Discussion : slight compression movement recorded 1982 , then <br /> slight tension in 1983 . Both measurements within surveying <br /> margin of error (+/-0 . 05 ft) . Adjacent pillar area worked <br /> mid 82 ; additionalsubsidence probable since last survey. <br /> See Figure 12 . <br /> Point No. : MC-8 <br /> Type : monitoring <br /> Installed: 1981 or 82 Surveyed: 1983 , 7/84 , 8/85 <br /> Location (mine coordinate system) : 16005 . 24N, 802 . 10E <br /> Original Elevation (ft) : 11 , 617 .69 <br /> Total Movement Since Installation (ft) : +0 . 04 <br /> Estimated Coal Removed Within Subsidence Zone (ft) : none <br /> Subsidence Ratio : -- <br /> Location Relative to Mine Workings : 790 ft SW of lw 301 No. <br /> 3 mine . <br /> Discussion: assumed stable since installation; recorded move- <br /> ments within surveying margin of error (+/-0 . 05 ft) . See <br /> Figure 13. <br /> Point No. : MC-9 <br /> Type: monitoring <br /> Installed: 1981 or 82 Surveyed : 1983 , 8/85 <br /> Location (mine coordinate system) : 15475 .20N, 896 .68E <br /> Original Elevation (ft) : 11 ,465 . 80 <br /> Total Movement Since Insatllation (ft) : +0 . 02 <br /> Estimated Coal Removed Within Subsidence Zone (ft) : none <br /> Subsidence Ratio: -- <br /> Location Relative to Mine Workings : 1 , 000 ft SW of lw 301 <br />