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2.0 Test Cell Design Features <br /> 2.1 Test Cell Foundation <br /> The Test Cell foundation will be VLF-1 leached ore within a section of a haul road. The existing <br /> haul road has a gradient of 10%. <br /> 2.2 Test Cell Liner System <br /> The footprint of the Test Cell will be lined using an 80 mil double-sided textured linear low density <br /> polyethylene (LLDPE) geomembrane liner in order to capture leached solution. The liner will be <br /> placed on prepared subgrade (i.e., leached ore). <br /> 3.0 Stability Analyses <br /> Stability analyses were performed to confirm that the Test Cell stability meets the requirements of <br /> the Division of Reclamation, Mining and Safety Minerals Program (Division)'. This section <br /> presents the results of the stability analyses. <br /> 3.1 Material Parameters <br /> For the stability analyses, the following material properties were considered: <br /> ➢ Test Cell Foundation: Modeled with a unit weight of 120 pounds per cubic foot(pcf), an angle <br /> of internal friction of 40 degrees and no cohesion based on testing performed for the design of <br /> the VLF-1 leach pad; <br /> ➢ Run of Mine(ROM) Ore: Modeled with a unit weight of 110 pcf, an angle of internal friction of <br /> 40 degrees and no cohesion, based on previous testing of crushed ore as the materials have <br /> similar geotechnical characteristics; and <br /> ➢ Liner Interface: The interface between the geomembrane and the ore placed above and <br /> below was modeled with an angle of internal friction of 29 degrees with 275 pounds per square <br /> foot(psf)cohesion (large strain).This strength is based on the results of interface shear <br /> strength testing performed as part of the VLF-1 design where crushed rock overliner was tested <br /> versus a 100-mil smooth high density polyethylene (HDPE)geomembrane placed over low <br /> volume solution collection fill(refer to Appendix A),which is representative of the test cell <br /> conditions. <br /> 1 Cazier,T.and Wait,T.C. (2018)"Proposed Slope Stability/Geotechnical Analysis Policy for the Mined Land <br /> Reclamation Board." Memorandum dated 12 April 2018. DRAFT. <br /> Page 2 <br />