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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 /> of three (3) 18-inch diameter SDR11 HDPE pipes that will be connected to form a manifold. The <br /> bottom 22 feet of the riser pipes will be perforated to allow solution to flow into the manifold, <br /> where submersible pumps will be lowered to extract any solution and returned to the PSSA. <br /> Details of the LVSCS SRS can be referenced on Drawing A023. <br /> 4.7. Appurtenant Structures <br /> A haul road has been included in the design of the VLF Expansion.The haul road begins at the toe <br /> of the VLF2 Phase 1 stack and runs between the existing VLF1 and VLF2 to aid in the initial ore <br /> loading of the expansion. Although the road design has not yet been finalized, the layout has <br /> been included for information and planning purposes only. In its current iteration, the haul road <br /> is approximately 13,422 feet long, with a 100-foot driving width. The road will be constructed <br /> using non-potentially acid generating(NPAG)general fill material.The road will have a minimum <br /> thickness of 20 feet on top of the liner surface will be maintained. <br /> 4.8. Reclamation/Closure <br /> Once the leaching activities have ceased,the facility will be rinsed and capped as described in the <br /> approved reclamation and closure plans in Amendments 10, 11, and 13. Based upon the current <br /> • ore loading scheme, the ore will be stacked in 100-foot high lifts, graded to have side slopes of <br /> 2(H):1(V), and 50 foot benches to meet the 2.5(H):1(V) maximum closure slope. At closure, the <br /> facility will be capped with topsoil and revegetated. Stormwater will be controlled in perimeter <br /> stormwater channels, bench channels, and drain down channels. Additional details of the <br /> Reclamation/Closure Plan are addressed in Exhibit E of the application. <br /> 4.9. Technical Specifications <br /> Throughout the development and operations of the two VLF facilities at CC&V, Technical <br /> Specifications have been established and modified as necessary to achieve the design intent and <br /> acceptable performance. The Technical Specifications included in Appendix D are the same as <br /> used in construction of Phase 3 of VLF2 except with the following update: <br /> 01050 Construction Staking, Part 1 General, Section 1.5 Construction Certification <br /> Documentation, Part B, Submittals by Contractor Upon Completion of Work, first bullet <br /> has been updated to say"Leak detection trench plan view showing the limits of the valley <br /> leach facility, leak detection trench alignment and leak detection sumps with spot <br /> elevations surveyed along the alignment to demonstrate the leak detection trench will <br /> flow towards the sump and a survey frequency less than 100-feet between points." <br /> • <br /> Page 16 <br />