2009-09-21_PERMIT FILE - C1981010 ‎(13)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 9/21/2009
• Doc Name: Trapper G-Pit Landslide Mining Assesment, January 2008
• Section_Exhibit Name: Appendix T
• Media Type: D
• Archive: No

January 15, 2008
Page iii
LIST OF FIGURES (CONCLUDED)
Page
Figure 24. Highwall Slope Stability Failure at G-Strike Pit After September 2005 Failure ...... .38
Figure 25. Landslide Slope Failure at G-Dip Pit in October 2006 .............................................39
Figure 26. FLAC31) Model Geometry Developed to Analyze Stability of G-Pit Landslide ..... .40
Figure 27. Failed Region for September 2005 Highwall Failure in G-Strike Pit as Predicted
By 3D Analysis from Displacements and Plastic Failure Indicators ......................... 41
Figure 28. Photograph of Failed Region for September 2005 Highwall Failure in G-Strike
Pit ........................................................................................................................... 42
Figure 29. Failed Region for October 2006 Landslide Failure in G-Dip Pit as Predicted by 3D
Analysis from Displacements and Plastic Failure Indicators .................................... 43
Figure 30. Aerial Photograph of Failed Region for October 2006 Landslide Failure in
G-Dip Pit ................................................................................................................ 44
Figure 31. Mine Plan for First Part of Z-Dip Pit ....................................................................... 45
Figure 32. Photograph of Surface Cracking Associated with 2001 Highwall Failure in
G-Test Pit Downdip of Z-Dip Pit Barrier Pillar Area ............................................... 46
Figure 33. Minor Near-Surface Failure Expected for Z-Dip Pit as Predicted by Previous
Failure Plastic Indicators and Low Equilibrium Velocities ...................................... 47
Figure 34. Photograph of Z-Dip Highwall as of Cut #2 Illustrating Excellent Highwall
Condition ................................................................................................................ 48
Figure 35. Model Boundaries and Mining Sequence for East-Panel Pit and A-East Pit
Stability Analysis .................................................................................................... 49
Figure 36. FLAC313 Model Boundaries of East-Panel Pit and A-East Pit Stability Analysis
Showing Surface Topography and Bedding and Simulated Mining Areas ............... 51
Figure 37. Proposed Mining Layout for K-Pit, G-Pit, East-Panel Pit, and A-East Pit
Along with Outline of Landslide Area ..................................................................... 52
Figure 38. Schematic Example of Mining in Steeply Dipping Beds Locations of K-Pit
Outside the Landslide Area ..................................................................................... 55
Figure 39. Proposed Locations of Groundwater Extraction and Monitoring Wells for
Landslide ................................................................................................................ 58
Agapito Associates, Inc.