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i <br /> 5. The effects of depth and mining geometry on subsidence <br /> 6. The visible effects of subsidence on the ground surface for this <br /> given environment. ,, <br /> Task III - Instrument Installlation <br /> Mine Subsidence Engineering Company proposes to install the subsidence <br /> monuments in June, July and August of 1981. Monuments will be installed by a <br /> supervisor and a three-man crew working six days a week. Both men and , <br /> materials will be flown in on a weekly basis using a helecopter. <br /> It is anticipated that the monument net will be installed before subsi- <br /> dence from mining the upper lift of panel 302 reaches the surface even though <br /> panel 302 will begin mining in May of 1981. This is a consequence of the <br /> depth of cover over the panel . The locations of the perpendicular lines <br /> will also help insure that ,no subsidence data is lost. <br /> Task IV - Monitoring <br /> The severe winter climate will restrict monitoring of the proposed subsi- <br /> dence net to the time period between July 15 and September 15. The proposed <br /> subsidence monitoring schedule is outlined beloa. The entire survey net %:till <br /> be monitored for each survey indicated. <br /> PROPOSED SUBSIDENCE MONITORING SCHEDULE - <br /> Lift 1981 1982 1983 10-84 1985 1986 <br /> 301 L I II II AAA FFF F <br /> 302 I AA AA FFF FFF F <br /> 302 L I <br /> II II III AAA F <br /> I - Initial Survey <br /> • A - Active Survey <br /> F - Final Survey <br /> -12- <br />