Laserfiche WebLink
• be rinsed in segments with portions being actively rinsed while other areas are <br />allowed to "rest." Rinse water and H2O2 will be circulated using the VLF <br />pumping system at a pumping rate of approximately 28,000 gpm. <br />Rinsing criteria previously approved for the VLF is an average concentration of <br />0.2 mg/l CNWAD in the rinsate from meteoric water mobility testing on <br />representative sampling of the spent ore, or in return flows derived from the <br />detoxified ore, or both. A four-year monitoring period will follow the rinsing to <br />demonstrate compliance with the standard. Physical reclamation of the VLF will <br />be completed concurrent with the monitoring period. <br />Upon achieving the CNWAD removal criteria, the VLF liner system will be <br />breached in the same manner as previously approved. The liner will be perforated <br />to prevent excessive accumulation of water in the spent ore behind the toe berms <br />and to move meteoric draindown water into the underlying diatreme rock. It is <br />anticipated that a drill rig will be utilized to drill from the surface of the ore on the <br />VLF through the synthetic and clay liners toward the underdrains, where <br />appropriate. Holes will be drilled to puncture the liner above the blanket drain <br />• installed at several locations beneath the Phase 5 PSSA. This will allow <br />conveyance of post-reclamation precipitation through the ore pile and into the <br />underlying diatreme rocks. <br />The slopes of the VLF will be recontoured to an overall slope of approximately <br />2.511:1 V. Portions of the benches created during operations will be retained, as <br />appropriate, for geotechnical and erosional stability. The topography shown on <br />Drawing F-1 and the financial warranty calculations presented in Section 12.0 of <br />this Project Description have been conservatively developed based on an overall <br />2.5H:1 V slope criterion. <br />Growth medium will be applied to a depth of approximately six inches over the <br />regraded VLF and associated disturbances. After placement, the growth medium <br />will be amended as needed, and seeded pursuant to the procedures previously <br />presented in Section 11.3. <br />The VLF closure and reclamation process, including cyanide removal and <br />monitoring and physical reclamation, is scheduled to take up to nine years after <br />final leaching of ore. Regrading, soil placement, and revegetation are expected to <br />• Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />11-14