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~~ <br />ark <br />SMITH WILLIAMS CONSULTANTS, INC. <br />^ Appendix G.2 -Pan Evaporation Background <br />Appendix H -Technical Specifications <br />1.1 Project Description <br />The existing ore processing and beneficiation facility is located approximately one mile <br />southwest of the Main Cresson surface mine. CC&V presently uses a primary and secondary <br />crushing operation to reduce the ore to a nominal 3/o-inch minus material. A conveyor system is <br />used to transport the crushed ore to a truck load-out bin (LOB) where haul trucks are then used to <br />place the ore in lifts on the VLF. <br />Phases I, II, III, and IV of the current VLF consist of approximately 16.4 million square feet <br />(plan area) of lined and active leach area. The Phase 5 VLF design will consist of an additional <br />6.4 million square feet (surface area corrected for slope) of lined leach area, located north and <br />east of the Phase IV VLF. Phase 5 of the VLF provides additional area for both ore storage and <br />construction of an internal PSSA. Each of these areas will include composite liner systems <br />incorporating the same design as the existing VLF. Within the ore storage area, the composite <br />• liner will be composed of a 12-inch-thick soil liner fill (SLF) with a 1 X 10-6 centimeter per second <br />(cm/s) or lower permeability overlain by an 80-mil single-sided textured linear low-density <br />polyethylene (LLDPE) geomembrane, which is overlain by a minimum of 2 feet of drain cover <br />fill (DCF). Within the PSSA, the liner system will consist of 12-inch-thick SLF with a 1 X 10-6 <br />cm/s or lower permeability, overlain by a 100-mil textured LLDPE geomembrane, overlain by 3 <br />feet of low volume solution collection fill (LVSCF), overlain by a 100-mil smooth LLDPE <br />geomembrane, overlain by 2 feet of DCF. Some areas of the PSSA will also include 100-mil <br />double-sided textured LLDPE geomembrane over the LVSCF to provide additional traction for <br />material placement. <br />The Phase 5 VLF ore stacking design was developed using 1.6H:1 V overall side slopes in all <br />areas around the perimeter of the VLF, which is consistent with the existing VLF. This design <br />also includes increasing the maximum ore depth over liner to approximately 800 feet within the <br />Phase I through Phase IV VLF, based on testing of the liner materials, as reported herein. The <br />maximum ore depth in the Phase 5 VLF will be 590 feet. The Phase 5 VLF final ore topography <br />is shown on Figure 1. Cross sections through the Phase 5 VLF are shown on Figure 2. <br />Native ground recontouring and grading within the limits of Phase 5 VLF were developed so that <br />the foundation slopes would be 2.SH:1 V or shallower, with the exception of localized areas with <br />• <br />S:\PROJECTS\1125 CCSV PHASE 5 VLF\H2 - DESIGNWREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 6 <br />