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Cripple Creek&Victor Gold Mine w <br /> Valley Leach Facility 2 Phase 3 . <br /> Detailed Design for Permitting,Revision 1 <br /> NewFields Project No.475.0106.033 <br /> July 2020 <br /> ;�- Updating the Construction Technical Specifications for VLF2 Phase 3. <br /> 2. SITE DESCRIPTION <br /> 2.1. Location and Topography <br /> CC&V is located in Teller County, Colorado, in between the towns of Cripple Creek and Victor. <br /> VLF2 is located in the Squaw, Anaconda, and Swede Gulch areas, between Raven and Gold Hill. <br /> The VLF2 Phase 3 expansion will extend the permitted VLF2 facility to the North, into the <br /> proposed Schist Island Pit,and East against the existing SGOSA. Drawing A01 shows the proposed <br /> limits of the expansion. <br /> 2.2. Climate <br /> In October 2018, CC&V commissioned Knight Piesold (KP) to evaluate the current stormwater <br /> management plans for the site. As part of their evaluations, KP provided recommendations to <br /> update the climate data, including increasing the 100-year/24-hour storm event to 4.1 inches. <br /> These recommendations have been utilized in the water balance and closure stormwater channel <br /> sizing. <br /> 2.3. Underground Workings <br /> It is anticipated that the underground workings within the footprint of VLF2 Phase 3 will be <br /> removed during the development of Schist Island Pit. However, if encountered,the features will <br /> be mitigated as needed to provide a robust and safe foundation for the expansion. Based on the <br /> remediation plans completed during the construction of the current VLF2 and Phase 5 of VLF1, <br /> the following guidelines will be used: <br /> Shafts/Stope Remediation <br /> o For open excavations where the depth of bedrock is less than 7 feet below the <br /> final soil liner fill (SLF) subgrade surface: Backfill open shafts with coarse shaft <br /> backfill to approximately 10 feet below the SLF subgrade and then place a <br /> concrete plug, cemented rock fill, and structural fill to achieve SLF subgrade <br /> surface. <br /> o For open excavation where the depth to bedrock is greater than 7 feet below the <br /> final SLF subgrade surface: Backfill the open shaft with coarse shaft backfill to 3 <br /> feet below the soil/bedrock interface. Then place a concrete plug, cemented <br /> rockfill, and structural fill to achieve SLF subgrade surface. <br /> o For collapsed excavations where the depth to bedrock is less than 7 feet below <br /> the final SLF subgrade surface: Excavate collapsed material from shafts to a depth <br /> of 25 feet below the SLF subgrade surface,then backfill with coarse shaft backfill <br /> Page 3 <br />