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2. Analyzed Slopes — Active Mining & Reclamation Slopes <br /> The Active Mining slope is 2H:1V and a maximum 35-ft tall. This slope will be maintained <br /> throughout the active highwall, before being backfilled to the final reclaimed slope. In the <br /> Reclaimed Condition, the site is backfilled to approximate original topography. <br /> The sand and gravel being mined is modelled as cohesionless. Therefore, the driving property <br /> of slope stability will be the friction angle of the material (45°). Any slope angle steeper than that <br /> will have a Factor of Safety of<1. Since the Active Mining slope does not have a sufficient <br /> Factor of Safety (1.50), the next step in the analysis is to identify the crest of the failure slope <br /> with a Factor of Safety equal to or greater than the standard (1.50) and determine if that failure <br /> slope affects offsite ground (i.e., ground further than 100-ft from the mining slope crest). <br /> Through an iterative analysis, the failure slope for a Factor of Safety of 1.50 for the Lamar Pit <br /> Active Mining slope condition is located at a distance of 63-ft from the nearest offsite ground <br /> (Figure GS-2). <br /> Table GS-2 lists the analysis conducted and their respective factors of safety. <br /> GALENA data tables and analysis result figures are attached as Appendix GS-1. <br /> Lamar Pit ,�$' j Typical Section <br /> x. <br /> Reclamation Map 4 <br /> Exhibit E "l , sF,rma.InC �,. I, <br /> 0. Slope Analyzed in �r� own;- <br /> l. '� 'rro.a ras L <br /> ' • „ ; - d, GALENA.See Figure GS-2 4' is -e'e <br /> ,. eop w�.r •� <br /> /' "' //4°////// / •♦. .3619•' / Legend <br /> / • A Land will be reclaimed.,Range Land use.it 9 Gcr•s) 1I tri <br /> •, �/ /o „ w, „ / .•., PProfessing •R I �.M.u• <br /> J c,ad eg nr m�e ar.a w i lie R,,,eM.x ra me avv�o.. ♦• • Jjprage,and •• t <br /> ••+�• � ,� � re is•., r,rel��amine .e,i �• 'cage' Area •� cop <br /> •♦,,/j am lie o,ro/ �o///// / ♦• ld•;'res) o r eM <br /> �Z <br /> iroustrlai <br /> �Y new <br /> 1 �� �� �s.Pot vl•"r •=yaw. ♦• .- sm,�,. e <br /> +«.Q` Processing,♦• •� <br /> ♦• Storage,and <br /> 4 '-`vs.'-`vs.3'0•1 Stockpiling Area 'ii"" I <br /> • •♦• � Ex,st i9E os nn B�=° •'I) ng.. I-�4��. <br /> Scale Pin ,,,,lnw I <br /> +• ,-�' Map By James Higgs <br /> r300'-0" P,�v � <•♦ I', An-Rne Paving a Redi-Mix 12/1/21 <br /> ,,i i t <br /> Figure GS-1. Locations of Slope Stability Analysis from the Approved Reclamation Map <br /> Lamar Pit GS-2 © Lewicki& Associates <br /> April 2025 <br />