2009-03-02_PERMIT FILE - C1980004 (5)

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TABLE OF CONTENTS EXECUTIVE SUMMARY .................................................................,........................................... 3 1.0 INTRODUCTION .................................................................,..................................... .. 3 1.1 Scope of Services ............................................ 4 ..................................................... 2 0 SITE DESCRIPTION AND GEOLOGIC .. . SETTING .......................................................... .. 4 3.1 Gob Pile Investigation ........................................................................................... .. 4 2.2 Geology ...................................................................... 5 ........................................ 3.0 SUBSURFACE CONDTiTONS .. ...................................................................................... 3 1 Gob Pile Investi ati .. 5 . g on ........................................................................................... .. 6 3.2 Monitoring Well ................................................ 6 .................................................... 4 0 LABORATORY TESTING : .. . ........................................................................................... .. 7 4.1 Index Properties ................................................ 7 ................................................... 4.1.1 Gob Material . .. 7 ................................................................................................ 4 1 2 Native Foundation Soils .. . . ................................................................................ 4 2 Triaxial Com res i T ti .. 7 . p s on es ng ................................................................................. .. 9 4.2.1 Unconsolidated-Undrained (UU) Triaxial Testing on Gob ................................. .. 9 4.2.2 Consolidated-Undrained (CU) Triaxial Testing on Gob ..................................... .. 9 5.0 STABILITY EVALUATIONS ......................................................................................... 10 5.1 Cross-Sections and Geometry ................................................................................ 10 5.2 Shear Strength Parameters ....................................... 10 ........................................... 2 5 1 Gob . . ............................................................................................................... 10 5.2.2 Foundation Soils ........................................................................................... 11 5.3 Stability Evaluation Results .................................................................................... 11 5.4 Sensitivity Analyses ........................................................... .................................... 12 5.4.1 Total Stress Analyses ..................................... 12 ............................................... 5 4 2 Effectiv St A l . . e ress na yses ................................................................................ 12 6.0 CONCLUSIONS AND RECOMMENDATIONS ................................................................ 13 7.0 REFERENCES ............................................................................................................ 14 8.0 CLOSING CONSIDERATIONS ..................................................................................... 14 DRAWINGS DRAWING 1 DRAWING 2 DRAWING 3 VICINITY MAP SITE MAP SITE PLAN APPENDICES APPENDIX A APPENDIX B APPENDIX C APPENDIX C.1 APPENDIX C.2 APPENDIX D APPENDIX D.1 APPENDIX D.2 APPENDIX D.3 BOREHOLE LOGS LABORATORY INDEX TEST RESULTS TRIAXIAL SHEAR TEST RESULTS UU TRIAXIAL SHEAR RESULTS CU TRIAXIAL SHEAR RESULTS LIMIT EQUILIBRIUM STABILITY ANALYSIS OUTPUT CROSS SECTION A-A' CROSS SECTION B-B' SENSITIVITY ANALYSES ~~ Ir~J • McClave Canyon Mine stability report Project #07-334-GEO Page 2 of 15