2020-05-13_REVISION - M2008017 ‎(6)‎

• Permit No: M2008017
• IBM Index Class Name: Revision
• Doc Date: 5/13/2020
• Doc Name: Adequacy Review Response
• From: Broken Arrow Investments LLC
• To: DRMS
• Type & Sequence: TR4
• Email Name: ECS
• Media Type: M
• Archive: No

GALENAVersion 7.2ProjectDerr Pit Technical Revision 4 East Grading With Reservoir - Slope S-N - No Loads - Pseudostatic File:C:\Galena Models\Derr East Grading Slope S-N no loads-EQ.gmfEdited:Processed:13 May 202013 May 2020J & T ConsultingLicensed to: AnalysisResults 1Multiple Stability AnalysisSpencer-WrightCircularMethod:Surface:Critical Factor of Safety: 1.95Interslice Force (Final) Angle: 6.4°Material Keys1: Overburden (c:150 ø:22 g:131)2: Sand and Gravel (c:0 ø:35 g:125)5: Slurry Wall (c:0 ø:45 g:110)6: Clay (c:150 ø:22 g:131)150 200 250 300 350 400 450455046004650470047500.07050 ftSlurry WallReservoir Crest50 ft