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r�°�ITASCK <br /> Denver, Inc. <br /> groups of the previous classification scheme into smaller groups. The relative abundance of the <br /> updated rock-type groups and their average NNP values are listed in Table 2-2. <br /> The generic Precambrian and biotite schist/gneiss rock-type groups were combined into one <br /> group for the analysis in this study, referred to herein as "Precambrian—biotite schist/gneiss" <br /> because of their low relative abundances (1%and 4%, respectively)and their similar geologic and <br /> acid-generation characteristics. <br /> 2.3 PHASE I SAMPLE SELECTION <br /> A total of approximately 50 samples (with larger sample numbers for the more abundant groups) <br /> were recommended for Phase I testing. Itasca and CC&V identified core intervals from the <br /> database for Phase I testing that represented the ranges of rock types,AGPs, ANPs, and NNPs for <br /> the Project waste rock. Itasca and CC&V personnel coordinated the collection of 29 samples for <br /> Phase I testing. The selected samples, their original and updated geologic classifications, the <br /> borehole they were collected from, and their depth and location are listed in Table 2-3. Three <br /> samples, PC3, PC4, and PC6, were classified by CC&V as a mixture of generic Precambrian and <br /> biotite schist/gneiss. This further supports the combination of the rock-type groups generic <br /> Precambrian and biotite schist/gneiss in the analysis contained in this report. Table 2-2 lists the <br /> percentage of Phase I samples in each updated rock-type group. The only updated rock-type <br /> groups that were not represented by at least one Phase I sample were dump/fill material, <br /> hydrothermal breccia, and syenite. Dump/fill material was not included because it is composed <br /> of a mixture of the other rock-type groups, and hydrothermal breccia and syenite were not <br /> included because they both compose 2% or less of the total waste rock. The Phase I samples are <br /> summarized in Table 2-3, and the locations of the boreholes that the samples were collected <br /> from are illustrated in Figure 2-4. The Phase I samples represent each of the major past and <br /> anticipated future mining areas and also represent the general range of past and anticipated <br /> future mining depths. <br /> 7 <br />