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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 />September 2025 <br /> <br /> <br /> <br />Page 19 <br /> <br /> <br />Figure 5.1 - Non-Linear Failure Envelope at 15 Percent Strain <br /> <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.