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Court Case Number W-2991 and W-2993, respectively for details), which allows OSMI to use water <br /> for mining and milling and other commercial uses. <br /> The water used in milling and mining, including dust suppression, is sourced from the ditch that runs <br /> the length of the Revenue Tunnel. During times of higher flow, a certain volume of water is stored <br /> underground in a sump for use during lower-flow winter months. Potable Water for human <br /> consumption, shower and toilet facilities comes from a groundwater vault that was excavated in host <br /> rock to avoid mineralized veins. The potable water vault is adjacent to the Revenue Tunnel and <br /> captures groundwater prior to interaction with Revenue Tunnel water. Potable water is treated at the <br /> surface using a chlorination system permitted through the state's drinking water program. <br /> Water Balances presented in this exhibit rely on climate data presented in Exhibit K for precipitation <br /> and evaporation. Water quality and quantity information is discussed in detail in Exhibit U. <br /> 3.1 Development Water Balance <br /> Development mining has been occurring in this area for decades. Development of new passage to <br /> access veins is also a continuous, though potentially intermittent, process occurring early in the mine <br /> life and throughout the bulk of operations. Development work will be conducted concurrent with <br /> mining activities and therefore the water balance for development and mining/ operations are <br /> combined. <br /> 3.2 Operational Water Balance <br /> OSMI has sufficient water to conduct its operations. <br /> The operational water includes development work, mining, milling, loss to tailings, increased human <br /> consumption (associated with increased staffing during operations) as well as precipitation and <br /> evaporation at treatment ponds. Because the host rock has been well-drained for decades by the Lower <br /> Mountain Top, and Ruby Trust upgradient, the Revenue Portal, and the Camp Bird Portal <br /> downgradient, substantial increases in flow with mining are not anticipated. Figure G-1 depicts the <br /> general water balance for the site. Water consumed by mining and mine development is approximately <br /> 60 gallons per minute (gpm). Water consumed by milling operation is approximately 4 to 7 gpm, <br /> which includes water contained in tailings and concentrate. The Revenue portal conveys anywhere <br /> from approximately 100 to 1000 gpm depending on the season. Rain and snowmelt contribute <br /> Revenue Mine December 2021 G-5 <br />