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Cripple Creek&Victor Gold Mine <br /> Valley Leach Facility 2 Phase 3 v■ <br /> Detailed Design for Permitting,Revision 1 <br /> NewFields Project No.475.0106.033 <br /> July 2020 <br /> > Stage A <br /> o 3.3 million square feet of lined pad <br /> o Contains the PSSA and PSSA embankment <br /> o Backfills first phase of the Schist Island Pit <br /> o Refer to Drawings A07 and A08 for limits of Stage A and the PSSA <br /> > Stage B <br /> 0 2.8 million square feet of lined pad <br /> o Abuts against the west face of the SGOSA <br /> o Refer to Drawing A09 for limits of Stage B <br /> Stage C <br /> 0 1.9 million square feet of lined pad <br /> o Backfills second phase of the Schist Island Pit <br /> o Refer to Drawing A10 for limits of Stage C <br /> The ultimate ore stacking design for this project was developed using an overall slope of 2.5 <br /> horizontal (H):1 vertical (V), around the perimeter of the facility. The design assumes an ore lift <br /> height of 50-feet placed and graded at an approximate 2H:1V slope and 25 foot wide benches <br /> between lifts. In accordance to the previous designs, the maximum design ore depth over the <br /> liner is 800 feet. <br /> Post closure surface water diversion channels for VLF2 have been updated to include the Phase <br /> 3 expansion. All of the closure channels will convey the stormwater flow resulting from the 500- <br /> year/24-hour storm event. <br /> 1.2. Scope of Work <br /> NewFields was retained by CC&V to provide engineering services for the VLF2 Phase 3 expansion. <br /> This design report includes the following: <br /> Design and layout for the Phase 3 expansion into three stages; <br /> > Updating the Water Balance Model for the Phase 3 PSSA Sizing <br /> > Design of the PSSA riser system; <br /> > Hydraulic design of the closure stormwater diversion channels for VLF2; <br /> A design report suitable for management and agency review; and <br /> Page 2 <br />