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<br />D.8.1 Tailinos Disposal <br />' The mill tailings will be dewatered to a moisture content <br />of approximately 22 percent by a drum filtering or cycloning <br />and screening process prior to transportation to the south <br />waste rock disposal area. Dewatering in the mil reduces the <br />overall demand for makeup water by minimizing the amount of <br />water retained in the tailings voids and eventually lost to <br />the tailings disposal area. <br />Based on the proposed milling rate of 2.500 tpd and <br />' tailings moisture content of 22 percent, approximately 132,000 <br />gallons or 0.4 acre-ft of water will be lost to the tailings <br />' disposal facility on a daily basis. Fora typical month, this <br />outflow rate will result in a loss of approximately 12 acre- <br />ft of water as noted in the last column of the water balance <br />spreadsheet. <br />D.8.2 Hean Leach Facility <br />For the heap leach facility, the monthly water flows <br />which were identified include the following: <br />' Inflows - Precipitation and runoff <br />~~ - Draindown from deactivated leach <br />areas <br />Losses - Pond evaporation <br />- Spray evaporation <br />- Wet-up of dry ore <br />I~ Precipitation and runoff have been estimated using the <br />average monthly precipitation values presented in Exhibit K <br />in conjunction with a runoff coefficient of 1.0. The 100-yr, <br />24-hr design storm for the project site has been determined <br />to be 2.9 inches of precipitation based on interpretation of <br />regional maps. <br />D-58 <br />