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Cripple Creek&Victor Gold Mine 111 <br /> Valley Leach Facility Expansions ■ <br /> Detailed Design for Permitting <br /> NewFields Project No.475.0106.064 <br /> • March 2024 <br /> 6.2.2. System Outflow Evaluation <br /> Two Expansions of the CC&V VLFs (VLF2 Phase 4 and VLF1 Phase 6) were simulated using the <br /> existing site-wide water balance model in GoldSim. The objective of the assessment was to <br /> determine the Life of Mine (LOM) water management implications of the two new phases. <br /> Assuming good operational practices are followed, the results show the following. <br /> The water management system can be held relatively stable over time with sufficient <br /> water storage capacity in the PSSAs to buffer short-term and seasonal variations, <br /> preventing excess solution being discharged to the environment. <br /> The greatest potential for water deficit occurs between 2033 and 2035, a period where <br /> the rate of ore deposition is at its highest rate and the average thickness of ore increases <br /> significantly. Solution uptake by new ore reduces the flow of enriched solution, in turn, <br /> limiting water available for re-irrigation. <br /> The greatest potential for excess water occurs immediately after 2036 when the VLFs are <br /> at their largest extent and a large amount of solution is in circulation. Therefore, caution <br /> will be required during the preceding years of deficit not to use excessive fresh water to <br /> make up the spent solution. <br /> • A combination of rapid flow from lined areas and delayed flow from stacked areas <br /> produces significant volumes of water following a large storm event.The flow and volume <br /> generated from lined areas are, however, modest compared to design irrigation flow <br /> rates and storage capacity of the PSSAs. The greater challenge will be medium-term <br /> (weeks to months) following the event as water drains from the stacks. <br /> Volumes generated by a large storm event can be managed even with a 24-hour power <br /> outage, provided that design freeboard volumes are maintained. <br /> 7. REFERENCES <br /> AMEC Earth and Environmental (2011). Cripple Creek & Victor Gold Mining Company, Dump 1 <br /> including Mill Platform Stability Evaluation, 05 January. <br /> American Society of Civil Engineers (2017). ASCE Standard 7-16: Minimum Design Loads and <br /> Associated Criteria for Buildings and Other Structures. <br /> Bray, J.D., and Macedo J. (2019). Procedure for Estimating Shear-Induced Seismic Slope <br /> Displacement for Shallow Crustal Earthquakes, Journal of Geotechnical and <br /> Geoenvironmental Engineering, Vol. 145, No. 12. <br /> Bowles,Joseph E., (1997). Foundation Analysis and Design, Fifth Edition. McGraw-Hill,Singapore. <br /> • <br /> Page 25 <br />