2021-10-11_REVISION - M1973021 ‎(5)‎

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 10/11/2021
• Doc Name Note: Adequacy2 AM7 Appendices
• Doc Name: Adequacy Review Response #2
• From: Aggregate Industries
• To: DRMS
• Type & Sequence: AM7
• Media Type: D
• Archive: No

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Aggregate Industries – Morrison Quarry GEI Consultants, Inc.
AM-07 Geotechnical Stability Exhibit November 2020

6.3.2 SLOPE/W ................................................................................ 29
6.3.3 FLAC/Slope ............................................................................. 29
6.3.4 Material Properties used in Stability Analyses ......................... 30
6.3.5 South Quarry ........................................................................... 31
6.3.6 West Quarry ............................................................................. 31
7. Stability Analyses Results .......................................................................... 32
7.1 Kinematic Analyses ............................................................................. 32
7.1.1 South Quarry Kinematic Analyses ........................................... 32
7.1.2 West Quarry Kinematic Analyses ............................................ 36
7.2 Slope Stability Analyses....................................................................... 36
7.2.1 South Quarry ........................................................................... 36
7.2.2 West Quarry Global Stability Analyses .................................... 38
8. Recommendations ...................................................................................... 40
8.1 Highwall Recommendations ................................................................ 40
8.1.1 Recommendations for Rock Mass Stability ............................. 40
8.1.2 Recommendations for Kinematic Stability ............................... 41
8.2 Rock Cut Highwall Performance Monitoring Recommendations .......... 42
8.2.1 Visual Inspection Monitoring .................................................... 43
8.2.2 Survey Monitoring .................................................................... 43
8.3 Highwall Reclamation Recommendations............................................ 44
9. Limitations ................................................................................................... 45
10. References ................................................................................................... 46

List of Figures in Text
Figure 2-1. Stereonet plots showing poles to planes with average joint set windows for the South
Quarry (upper) and West Quarry (lower).
Figure 5-1. Hoek-Brown Failure Criterion for local stability (left) and global stability (right).
Figure 5-2. Histogram showing distribution of low and high low RMR ranges measured in the active
South Quarry as observed in the annual highwall inspections for the years between
2013 and 2019.
Figure 5-3. Histogram showing the distribution of RQD measurements as measured in rock cores
from the South Quarry.
Figure 5-4. Excerpt from Hoek-Brown (1988) where rock mass parameters are compared using the
different methods discussed in this section. The inset on the right summarizes the input
parameters selected for Morrison Quarry
Figure 6-1. Plan view showing the proposed mine configuration for the South and West Quarry’s,
with thick red and blue lines showing the highwall orientations evaluated in the kinematic
analyses. The contour shading shown represents the mining phase operations as noted.