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• <br />Job #: 68838.64986.03.3.14 Calc By: N. Anton; M. Nelson <br />Client: Denison Mines CHK By: G. Hazen Date: 1/27/2009 <br />Project: Hydrogeology Report Date: 2/3/2009 Calc #: 1 <br />Detail: Water Balance Estimation of Percolation <br />temperature and precipitation compiled over the period of record (1962 through 2007) and for <br />the wettest year on record (1997). Results indicated by the modeling for the Topaz Mine <br />development rock pile are expected to conservatively represent all of the Sunday Mines Group <br />development rock piles, although geotechnical data for only two of the development rock piles <br />is available. <br />The estimate suggests that significant percolation through development rock piles at the Sunday <br />Mines Group is unlikely based on the water balance model approach. The major factors that limit <br />percolation through the piles are precipitation and evaporation. As indicated by the climate data, <br />the area of the Sunday Mines Group is characterized as and (i.e., low precipitation). As a result <br />of the low precipitation and generally mild to hot temperatures, the rate of evaporation is <br />greater than the rate of precipitation for most of the year (based on the approach to estimate <br />potential evaporation prescribed by Subramanya 1994), resulting in an estimate of zero water <br />percolation through the development rock piles. <br />9 <br /> <br />MathCAD V14 Saved 2/17/20095:15 PM <br />N:\64986-Denison Mines\Task Order 3 - DMO <br />Page 9