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CONTENTS <br />Page <br />Abstract............................................................... ........... 1 <br />introduction........................................................................ 2 <br />Acknowledgments.................................................................... 2 <br />RoadsideMine study site.............................................................. 2 <br />Siteselection..................................................................... 2 <br />Sitedescription................................................................... 2 <br />Regionalgeology.................................................................. 3 <br />Mineptm....................................................................... 4 <br />Northwest section ................................................................ 4 <br />Southwest section................................................................ S <br />Third•wt:stsection............................................................... S <br />Subsidence-moukoring program ........................... ............................ 9 <br />Monument spacing and construction.................................................... 9 <br />Monumentlocadorss................................................................ 9 <br />Northwestsection ............................................................... 9 <br />Southwest section................................................................ 9 <br />Third•westsection............................................................... 10 <br />Monitoring procedures and equipment .................................................... t0 <br />Dataprocessing..................................................................... t0 <br />Subsidence results................................................................... it <br />Northwest section.................................................................. 11 <br />Southwestsection.................................................................. 11 <br />Third•westsection................................................................. 13 <br />Summary.......................................................................... 14 <br />References........................................................................ 15 <br />ILLUSTRATIONS <br />1. <br />Project location map .............................................................. <br />3 <br />2. <br />Roadside Mine study site........................................................... <br />4 <br />3. <br />Generalized overburden stratigraphy.................................................. <br />5 <br />a. <br />Detailed overburden stratigraphy..................................................... <br />5 <br />5. <br />Northwest section mine plan ......................................................... <br />6 <br />6. <br />Southwest section mine plan ........................................................ <br />7 <br />7. <br />Third -west mine plan.............................................................. <br />8 <br />8. <br />Total station geodirtmeter and reflection prism assembly ..................................... <br />10 <br />9_ <br />Subsidence profiles for northwest section ............................................... <br />11 <br />I0. <br />Location of subsidence cracks, northwest section .......................................... <br />12 <br />11. <br />Subsidence cracks located over northwest section, 1985 survey ................................ <br />12 <br />12. <br />Subsidence crack located over northwest section, 1991 survey ................................ <br />13 <br />13 <br />Subsidence proles for southwest section ............................................... <br />13 <br />14, <br />Subsidence profiles for third•wcst section ............................................... <br />13 <br />5�_ <br />