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Cripple Creek&Victor Gold Mine <br /> Valley Leach Facility Expansions ■ <br /> Detailed Design for Permitting <br /> NewFields Project No.475.0106.064• <br /> March 2024 <br /> 40,000 <br /> • 2023 Ore Testing Data <br /> 35,000 — — —Leps Lower Bound <br /> Legs Average <br /> 30,000 -----Leps Upper Bound Aar <br /> — 2020 Strength Envelope ab'� a6ao I <br /> 25,000 <br /> - 2023 Strength Envelope � <br /> c. <br /> 20,000 <br /> t 15,000 <br /> N <br /> 10,000 <br /> 5,000 <br /> 0 <br /> 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 <br /> Normal Stress(psf) <br /> Figure 5.1 - Non-Linear Failure Envelope at 15 Percent Strain <br /> • Composite Liner Interface: The composite liner for VLF includes a base of SLF that is a low <br /> permeable soil overlain by 80-mil, double-side textured LLDPE geomembrane, overlain by DCF. <br /> Interface direct shear testing (ASTM D5321) was previously completed to evaluate the shear <br /> strength of the composite liner system interface shear strength under a wide range of stress <br /> points (NewFields, 2020). The geomembrane used in the test was 80-mil Micro-spike LLDPE <br /> geomembrane. A non-linear, power fit was considered the most representative failure envelope <br /> for the measured data, as shown in Figure 5.2, and thus was used for the current evaluation.The <br /> shear strength envelope is only depicted up to about 70 percent of the maximum stress on the <br /> liner, as a result of the 800 feet of ore that will be stacked over it. <br /> Page 19 <br />