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<br /> <br />London Mountain Clean Up <br />July 2025 G-1 <br /> <br /> <br />Exhibit G Water Information <br />1. Groundwater Resources <br />Operations are not expected to disturb groundwater resources. Excavation and cleanup of the waste <br />piles will not involve excavating below the natural ground level and as such no groundwater will be <br />encountered. Neighboring wells have been mapped on Map C-1 for reference. As mentioned in Exhibit <br />U Section (8) of the 110D permit in Appendix 1, extensive groundwater studies have been conducted <br />prior to mining and throughout the 110D operation in order to ensure groundwater is not negatively <br />impacted from the mining. The London Mine 110D area retains all current mining plans without <br />alteration through this application, as documented in Appendix 1. <br /> <br />The groundwater system near the London Mountain Clean Up area of Alma, Colorado consists of <br />multiple interconnected aquifer units. Quaternary glacial deposits and alluvium form the uppermost <br />unconfined aquifer, which overlies a more complex bedrock aquifer system. The bedrock aquifers <br />include the karst-developed Leadville Limestone Formation, which functions as a confined aquifer, as <br />well as water-bearing fractures in Precambrian crystalline rocks and younger Tertiary intrusive bodies. <br />The area's extensive mining history has significantly altered the natural groundwater flow patterns. <br />Mine workings create artificial conduits that can connect different aquifer units and establish preferential <br />flow paths through the subsurface. Groundwater recharge occurs primarily through snowmelt from the <br />surrounding mountainous terrain, along with direct precipitation and losses from local stream systems. <br />2. Surface Water Resources <br />Surface water in Mosquito Gulch consists mostly of snowmelt from the mountain slopes and the runoff <br />from mountain rainfall. The continental divide runs along the east and north side of the gulch. No rivers <br />or major streams pass through the permit area. Exhibit T Section 1.1.1. outlines the stormwater and <br />sediment control measures of the Environmental Protection Plan for the London Mountain Clean Up <br />112D. In the 110D document located in Exhibit U Section (10)(a) of Appendix 1, surface water quality <br />improvement from mine activities is shown in the sites corresponding data. Through this operation, <br />MineWater strives continue the successful work of its previous cleanup activities. <br />Waste pile excavation and cleanup will remove potentially acid-forming material from the gulch and <br />lead to long term surface water quality improvement. The exact location and number of waste piles <br />being cleaned up is dependent on a variety of factors. Therefore, the surface water hydrology for this <br />operation has been organized into standardized basins. An evaluation of the likely waste pile targets of <br />this operation has shown that none will have a drainage area greater than 50 acres1 due to the high <br /> <br />1 The overall drainage basin area includes the waste pile itself and undisturbed ground that drains to a waste pile. <br />It is not related to the 20-acre disturbance limit.