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Revisions to Modeling Hydraulic Controls, West Pit Devon Hornvedt <br /> San Luis Project Newmont USA Limited <br /> water level elevation within the West Pit would result in surface discharge and eventual topping <br /> of the slurry wall. <br /> The partial and full slurry wall simulations that include extraction from well BF-5 at 20 gpm <br /> indicate that no groundwater is discharged from the West Pit. The potentiometric surface within <br /> the West Pit stabilizes at an elevation of approximately 8,584 ft amsl for both simulations. The <br /> volume of water that would require treatment is reduced from 200 gpm under current conditions <br /> to approximately 20 gpm. <br /> Based on simulations using the revised and updated West Pit model, the most effective means of <br /> hydraulically controlling groundwater movement from the West Pit to the Rito Seco and reducing <br /> the volume of water that will require treatment is the installation of a slurry wall along the south <br /> and west boundary of the Pit. <br /> 6.0 REFERENCES <br /> Engineering Analytics, Inc., 2019. Modeling Assessment of Potential Hydraulic Controls to <br /> Reduce Groundwater Flow to the West Pit, San Luis Project. Prepared for Battle Mountain <br /> Resources, Inc. by Engineering Analytics, July 2019. <br /> Engineering Analytics, Inc., 2022. Hydrologic Investigation Results,Alluvial Window, Southeast <br /> Portion of the West Pit, Battle Mountain Mine. Technical Memorandum prepared for Battle <br /> Mountain Resources, Inc by Engineering Analytics, May 20, 2022. <br /> Engineering Analytics, Inc., 2023. Hydrologic Investigation Results, Santa Fe Formation, <br /> Southeast Portion of the West Pit, Battle Mountain Mine. Technical Memorandum prepared for <br /> Battle Mountain Resources, Inc by Engineering Analytics, February 21, 2023. <br /> Harbaugh, A.W., 2005. MODFLOW-2005, the US Geological Survey modular groundwater <br /> model --the Groundwater Flow Process: US Geological Survey Techniques and Methods 6-A 16. <br /> U. S. Geological Survey, Reston, Virginia, 2005. <br /> HydroGeoLogic Inc., 1996. MODFLOW-SURFACT Software (Version 3.0), Herndon,VA. <br /> Pollock, D.W., 1994. Users Guide for MODPATH/MODPATH-PLOT, Version 3: A particle <br /> tracking post-processing package for MODFLOW, the US Geological Survey finite-difference <br /> groundwater flow model. Open-File Report 94-464. US Geological Survey, Reston, VA. <br /> May 2023 9 Engineering Analytics,Inc. <br />