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® APPENDIX D <br />March 2000 -i- 993-2099.150 <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION .................................................................................1 <br />2.0 UNDERGROUND MINING .....................................................................1 <br />2.1 Historical Setting ..............................................................................1 <br />2.2 Current Conditions ............................................................................2 <br />2.3 Rock Quality .................................................................................... 3 <br />3.0 SCOPE OF INVESTIGATION ...................................................................4 <br />3.1 Historic Mining Maps ..................... , ................................................... 5 <br />3.1.1 Locations of Surface Disturbance ................................................... 6 <br />3.2 Surface Reconnaissance and Exploratory Excavation ................................... 7 <br />3.3 Exploratory Drilling ..........................................................................8 <br />4.0 CONCLUSIONS FROM EXPLORATORY INVESTIGATIONS ....................... 10 <br />5.0 RECOMMENDED REMEDIATION MEASURES ........................................ 11 <br />5.1 Remediation of Isolated Shafts, Stopes. And Shallow Surface Mines .............. 12 <br />0 5.1.1 Remediation Of Open Shafts/Stopes .............................................. 14 <br /> 5.1.2 Remediation of Shafts/Stopes More Than 25 Feet Deep That Are Collapsed14 <br /> 5.1.3 Remediation of Shallow Shafts and Surface Mines ............................ 15 <br />5.2 Remediation of Open or Collapsed Laterals/Inclines/Adits .......................... 16 <br />5.3 Mined Slot .................................................................................... 16 <br />5.4 Remediation of Areas Influenced by Underground Workings ....................... 17 <br /> 5.4.1 Area 1 .................................................................................. 17 <br /> 5.4.2 Area 2 .................................................................................. 17 <br /> 5.4.3 Area 3 .................................................................................. 18 <br /> 5.4.4 Area 4 .................................................................................. 18 <br /> 5.4.5 Area 5 .................................................................................. 18 <br /> 5.4.6 Area 6 .................................................................................. 18 <br /> 5.4.8 Areas 8 to 10 ......................................................................... 19 <br />6.0 CONCLUDING COMMENTS ................................................................. 19 <br />7.0 REFERENCES .................................................................................... 20 <br />• <br />I-WA 099 MNAL RHORT MAPM.WX Golder Associates