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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 /> grading plan can be referenced on Drawing A008 and individual grading plans are shown on <br /> Drawings A012, A013, A014, A015, and A016. Prior to the construction of any stage, Issued for <br /> Construction (IFC) Drawings will be developed,and will consider updated in field conditions, mine <br /> production,contractor availability etc. It is anticipated that any changes to the design and staging <br /> of the VLF Expansion will be minor and will not require additional permitting. <br /> 4.3. Valley Leach Facility Foundation <br /> The proposed grading plan was developed based on the following data: <br /> 2021 topographic survey information, as the 2022 and 2023 flyover data are the same in <br /> the expansion area, but the 2021 flyover data is more detailed with existing ground <br /> features such as edge of road, location of power poles, outline of building, etc., <br /> The available as-built data in AutoCAD for the VLF1 and VLF2, and <br /> The proposed future Elkton Pit. <br /> The grading plan has been designed to limit steep slopes within the facility footprint. Generally, <br /> areas within the VLF footprint have been designed to have slopes shallower than 2.5(H):1(V) and <br /> 1111 graded to drain towards the existing VLF2 Phase 1/2 PSSA for the VLF2 Phase 4 Expansion, or the <br /> proposed PSSA for the VLF1 Phase 6 Expansion. However, due to site constraints, some areas <br /> within the VLF footprint have been designed at a steeper slope, with a maximum slope of <br /> 2(H):1(V). These areas have been limited to locations within internal to the VLF where steeper <br /> slopes will not affect facility stability. <br /> The final site grading contours may vary from those shown on the grading plan drawing to suit <br /> field conditions encountered during construction. Variations from the designed grading plan will <br /> be evaluated to assess impacts to the VLF performance and stability. Typical cross sections for <br /> the VLF pad grading are shown on Drawings A018 and A019. <br /> Cut material generated during the slope regrading will be used as structural fill so long as it meets <br /> the requirements in the Technical Specifications in Appendix D. <br /> 4.3.1. VLF2 Phase 4 Stage A <br /> The proposed footprint of the VLF2 Phase 4 Stage A Expansion is located under the existing Mill <br /> Platform, which is a lined area housing several buildings and miscellaneous infrastructure. Prior <br /> to construction, the Mill Building, along with any retaining walls and infrastructure will be <br /> removed.Any void and existing pipes in the area will be removed or grouted.The current grading <br /> plan places a minimum depth of structural fill over this area, so that the existing geomembrane <br /> • will remain intact and buried under the proposed primary liner.This expansion will be graded to <br /> Page 10 <br />