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Mr. Timm Comer <br /> Manager,Environmental Resources <br /> Hydro-JexTM Program Review ameO <br /> December 17, 2009 <br /> TOUGHV2 was used to simulate fluid injection into the unsaturated ore heap from the 9925 bench at <br /> shallow (9915 elv.), medium (9855 elv.), and deep (9810 elv.) injection depths. In all cases, the ore was <br /> assumed to be initially unsaturated (e.g. at residual moisture content). For the shallow injection scenario, <br /> the injection pressure was approximately '/2 of the overburden pressure, this is considered prudent given <br /> the injection point is only 10 feet below the ore bench surface. Figures 4 and 5 present the pressure <br /> profile and extent of saturation for injection at 9915 elevation after a period of 15 days. <br /> Figure 4 Pressure Profile 9915 Injection (112 overburden) <br /> SL <br /> O •0• <br /> 0,711 <br /> .514 <br /> .. ' <br /> Figure 5 Saturation Extent 9915 Injection <br /> SIPROJECTS\1125E CCV CQA\e correspondence\hydro jex letter.doc 4 <br />