2010-05-12_PERMIT FILE - C1981010

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 5/12/2010
• Doc Name: Revised K-Pit Butttress Fill Stability Analysis, Feb 2010
• Section_Exhibit Name: Appendix T
• Media Type: D
• Archive: No

February 1, 2010 Page ii
LIST OF TABLES
Paize
Table L Geotechnical Properties of Materials in K -Pit and Toe Buttress FLAC /Slope
andSLOPE/W Models ............................................................... ..............................4
Table 2. Revised Geotechnical Properties of Materials in K -Pit and Toe Buttress
Models....................................................................................... ............................... 6
LIST OF FIGURES
Figure 1.
Location of K -Pit Buttress and Modeled Sections ..................... .............................10
Figure 2.
K -Pit Relative Cut Sequence for Block 1 ................................. .............................11
Figure 3.
Pre - Mining Slope Stability Model Results ............................... .............................12
Figure 4.
Google Earth Image Showing Previous Slope Instability .......... ............................1.3
Figure 5.
Color -Coded Downdip Slope Gradients and Proposed K -Pit Mining Cuts ...........
1.4
Figure 6.
Generic Slope Analysis Layout ................................................ .............................15
Figure 7.
Potential Unstable .1-Seam Areas .............................................. .............................16
Figure 8.
Pre- Mining Slope Stability Model. Results ............................... .............................17
Figure 9.
Slope Stability Increased by Excavating Blocks K1 L -13 and K1 L -14 to
I -Seam ....................................................................................... .............................18
Figure 10.
Slope Stability During K -Pit Mining Cut K1Q -3 to Q- Seam .... ............................1.9
Figure I L
Slope Stability Increased with the Removal of I -Seam to Cut K1 L- 15 .................20
.Figure 12.
TMI- Proposed Buttress Configuration, Maximum Elevation 7,134 ft .................21
Figure 13.
TMI- Proposed Buttress with Reduced Height, Maximum Height 7,102 ft ..........22
Figure 14.
TMI- Proposed Buttress with Reduced Height, Maximum Height 7,052 ft ...........
23
Figure 15.
AAI- Proposed Buttress, Maximum Thickness 50 Ft above Existing Ground.......
24
DISCLAIMER: This report contains prgfessional opinions based on information provided by
the Owner. AAI makes no warranties, either expressed or implied, as to the accuracy or
completeness of the information herein. Opinions are based on subjective interpretations of
geotechnical data; other equally valid interpretations may exist. Identification and control of
hazardous conditions are the responsibilities of the Owner.
Agapito Associates, .Inc.