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Bil(Ly(e, Idarado Mining Company <br />June 16, 2005 <br />Page 3 <br />(median NNP value of 21.6 tons CaCO3/1000 tons). The average ANP/AGP ratio is 7.2 (median <br />ANP/AGP ratio of 5.9). Based on the results of the ABA tests, the vast majority of the repository <br />materials demonstrate a positive NNP which is unlikely to generate acidic conditions and the few samples <br />(4) with an ANP/AGP ratio less 3 only one sample demonstrated an ANP/AGP ratio of less than 1. It is <br />believed the materials placed in the repository will be geochemically stable as placed. <br />Additional materials currently being excavated from the Liberty Bell Area of the Development Property <br />are also being placed in the repository. Further geochemical testing of the additional materials will be <br />conducted as the materials are excavated. <br />P:\100915Vdi~iga\nn\ABA tntin6-Final.doc <br />