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1 <br />1 Draindown from deactivated areas has been estimated at <br />10 gallons per ton of ore with the remainder of solution being <br />held by capillary forces at the estimated field capacity of <br />12 percent moisture content. The 10 gallons per ton represents <br />the difference between the leaching moisture content of 16 <br />percent and the field capacity of 12 percent. <br />Pond evaporation has been estimated based on the monthly <br />1 lake evaporation values presented in Exhibit K. <br />Spray or sprinkler evaporation losses during heap <br />irrigation have been assumed to be negligitle as drip <br />irrigation techniques using emitters are proposed for use on <br />this project. Year-round leaching operations are anticipated <br />using drip irrigation techniques. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />The wet-up of "dry" ore is calculated as the moisture <br />required to raise the ore moisture content from its virgin or <br />mined state to that required for leaching. <br />D.8.3 Mine Pit Dewaterino <br />Based on the results of the mine pit hydrogeology study <br />presented in Exhibit G, an inflow to the water balance of as <br />much as 200 gpm has been assumed. The mine pit water will be <br />u.:ed as makeup water in the mill or heap leach circuits as <br />required, and otherwise will be used for dust control around <br />the project site. This inflow rate produces a net monthly <br />inflow of approximately 8,640,000 gallons or 27 acre-ft, and <br />has been incorporated in the sixteenth column the water balance <br />spreadsheet. <br />D.8.4 Water Balance Summary <br />The water balance analysis presented in Appendix G <br />indicates that the heap leach and tailings disposal operations <br />D-59 (Revised 4/20/890 <br />