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<br />V. CONCLUSIONS <br />Underground development has progressed beneath Foidel Creek <br />without any measurable surface subsidence taking place. Underground <br />development has progressed in lst Panel South with some measurable <br />subsidence taking place in the full pillar extraction area. The <br />first measurable subsidence occurred August 21, 1986. Monuments <br />SM-26 through SM-30 experienced subsidence movement from 0.3 feet <br />to 1.0 feet with maximum subsidence of 1.0 feet on monument SM-27. <br />The spoils slope south of the mine facilities are currently stable <br />at a 2H:1V slope. <br />A surface reconnaissance survey was conducted of all the mine <br />permit area, to determine if there is any evidence of possible <br />differential movement, or structural damage to surface facilities <br />associated with underground mining. There is no apparent evidence <br />of differential movement or structural damage to surface facilities. <br />The next scheduled resurvey of subsidence monuments and surface <br />structures, will begin in September, 1987, and will be followed by <br />another resurvey in December, 1987. <br />• <br />• <br />i <br />