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6885 <br />6880 <br />a~ <br />"~'.. 6875 <br />c <br />0 <br />6870 <br />a~ <br />w 6865 <br />a~ <br />U <br />,C 6860 <br />~ 6855 <br />6850 <br />Subsidence Profile, A-Line <br />Twentymile Coal Company, Foidel Creek Mine <br />0 100 200 300 400 500 <br />Profile Distance (feet) <br />- Pre-mining Surface +-Post-mining SurFace <br />December 1992 <br />