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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 13 <br /> The subgrade will be scarified, moisture conditioned and re-compacted prior to the <br />placement of structural fill. <br />The Structural Fill will be placed and compacted in accordance with the Technical Specifications. <br />4.4.2. Lined PSSA Basin <br />The VLF1 Phase 6 lined PSSA Basin is located upstream of the VLF1 Phase 6 PSSA Embankment <br />and is sized to hold 132.8 million gallons, which exceeds the minimum storage required as <br />determined from the water balance of 27 million gallons discussed below in Section 6.0. <br />The liner system for this PSSA will consist of the following: 12 inches of SLF, with a 1×10-6 <br />centimeters per second (cm/s) or lower permeability, overlain by a 100-mil double sided textured <br />LLDPE geomembrane, overlain by three (3) feet of low volume solution collection fill (LVSCF), <br />overlain by a 100-mil double sided textured LLDPE geomembrane with a permeability of about <br />3.25 x 10-9 m/s (Lee, Shin, & Kim, 2018), overlain by two to five (2-5) feet of DCF. Within the three <br />feet of LVSCF will be a system of 4-inch diameter perforated corrugated polyethylene (CPe) pipes <br />to assist in directing flow of the low volume solution to the collection system manifold, as <br />described in Section 4.8.2 below. <br />4.4.3. High-Volume Solution Collection Recovery System <br />The High-Volume Solution Collection Recovery System (HVSCS) will direct process solution flows <br />in the VLF1 Phase 6 PSSA area and into the Solution Recovery System (SRS). The High-Volume <br />Solution Collection Recovery System, Solution Recovery System (HVSCS SRS) consists of four (4) <br />24-inch diameter carbon steel vertical riser pipes connected by a manifold fabricated using a 36- <br />inch diameter SDR21 HDPE pipe for more efficient recovery. The pipes will house vertical turbine <br />pumps to extract solution for further processing. The bottom 22 feet of the pipes will be slotted <br />and fitted with a louvered screen to allow solution to enter the manifold. The vertical riser pipes <br />will be extended vertically with the ore placement in the VLF1 Phase 6 PSSA. In order to reduce <br />friction during fill placement and during any settlement that may occur, the pipes shall be <br />wrapped in 100-mil smooth LLDPE geomembrane. Additionally, the pipes have been fitted with <br />compression joints which will dissipate any force transmitted to the pipes via friction drag during <br />settlement. This compression joint design has been previously used on other PSSA riser systems <br />at CC&V. <br />To aid in the PSSA pond level monitoring, several piezometers will be installed within the DCF, <br />each placed further distance from the HVSCS. The location of the proposed piezometer will be <br />determined after the piezometers have been installed in the existing PSSA’s and that data has <br />been analyzed.