2021-12-29_PERMIT FILE - M2021009 ‎(23)‎

• Permit No: M2021009
• IBM Index Class Name: Permit File
• Doc Date: 12/29/2021
• Doc Name Note: Appendix GS-1 - Galena Informatinon
• Doc Name: Adequacy Review Response
• From: Lewicki & Associates/Young Ranch Resource, LLC
• To: DRMS
• Email Name: AME
• Email Name: MAC
• Media Type: D
• Archive: No

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Parameter descriptor: XL XR R
Range of variation: 479.00 700.00 25.00
Trial positions within range: 100 100 50
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6.2. RESULTS: Analysis 6 - Reclaimed Mined Bench Slope
Bishop Simplified Method of Analysis-Circular Failure Surface
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Critical Failure Surface Search using Multiple Circle Generation Techniques
Initial failure surface approximation- Factor of Safety: 84.890
Analysis Summary
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There were: 495014 successful analyses from a total of 500001 trial failure surfaces
4987 analyses terminated due to unacceptable geometry
Critical (minimum) Factor of Safety:40.51
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Negative normal stresses exist on the base of one or more slices;examine slice data and consult the GALENA Help
utility
Results Summary-Lowest 99 Factor of Safety circles
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Circle X-Left Y-Left X-Right Y-Right X-Centre Y-Centre Radius FoS
1 1.40 8327.13 1243.90 7850.00 736.60 8385.31 737.50 40.508 <--Critical Surface
2 1.40 8327.13 1236.83 7850.00 736.09 8391.45 737.50 40.513
3 1.40 8327.13 1243.90 7850.00 737.03 8386.41 738.01 40.513
4 1.40 8327.13 1243.90 7850.00 737.45 8387.51 738.52 40.518
5 1.40 8327.13 1236.83 7850.00 736.51 8392.53 738.01 40.519
6 1.40 8327.13 1243.90 7850.00 737.87 8388.61 739.03 40.523
7 1.40 8327.13 1229.76 7850.00 735.54 8397.41 737.50 40.524
8 1.40 8327.13 1236.83 7850.00 736.92 8393.60 738.52 40.525
9 1.40 8327.13 1222.69 7850.00 734.97 8403.20 737.50 40.525
10 1.40 8327.13 1243.90 7850.00 738.29 8389.70 739.54 40.527
11 1.40 8327.13 1229.76 7850.00 735.95 8398.47 738.01 40.530
12 1.40 8327.13 1236.83 7850.00 737.34 8394.68 739.03 40.530
13 1.40 8327.13 1222.69 7850.00 735.37 8404.24 738.01 40.532
14 1.40 8327.13 1243.90 7850.00 738.71 8390.79 740.05 40.532
15 1.40 8327.13 1229.76 7850.00 736.36 8399.52 738.52 40.536
16 1.40 8327.13 1236.83 7850.00 737.75 8395.75 739.54 40.536
17 1.40 8327.13 1243.90 7850.00 739.13 8391.88 740.56 40.538
18 1.40 8327.13 1222.69 7850.00 735.78 8405.27 738.52 40.539
19 1.40 8327.13 1229.76 7850.00 736.77 8400.57 739.03 40.542
20 1.40 8327.13 1236.83 7850.00 738.16 8396.82 740.05 40.542
21 1.40 8327.13 1243.90 7850.00 739.54 8392.96 741.07 40.543
YRR Geotech
October 2021 29 Lewicki&Associates