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F"-ITASCK <br /> Denver, Inc. <br /> bicarbonate (HCO3-). Therefore, 1 mole of calcium carbonate may neutralize only 1 mole of <br /> acidity, as shown in Equation 3.3. <br /> CaCO3 + H+-> HCO3-+ Ca2+ (3.3) <br /> Additionally, carbonate minerals such as siderite and ankerite may contribute false positives for <br /> neutralization potential because their acid-neutralization capacity is offset by the hydrolysis of <br /> the metal ions (iron and manganese) included in the minerals. The siderite correction method <br /> (Section 3.1.1.3) was used to account for this possibility. <br /> 3.1.3 Results <br /> The ABA testing results are summarized in Table 3-1, and the laboratory reports are provided in <br /> Appendix B. Table 3-1 includes AGP values calculated based on the sum of nitric acid-extractable <br /> and hot-water-extractable sulfur contents (as per NDEP 2015) and based on just the nitric acid— <br /> extractable sulfur, referred to as the sulfide AGP. <br /> Figure 3-1 shows a plot of AGP versus ANP values. The samples had a wide range of AGP values, <br /> from 1.25 to 221.25 kg CaCO3/t. The ANP values had a narrower range, with all the samples <br /> except three breccia samples ranging from 2 to 12 kg CaCO3A.Total inorganic carbon in 25 of the <br /> samples was below the practical quantitation limit of 0.5 percent carbon (Table 3-1). Samples <br /> that contained measurable amounts of TIC had the highest ANP values, indicating that the <br /> measured neutralization potential is associated with carbonate minerals. The samples with <br /> detectable carbonate contents were all from the breccia rock type. Samples below the line <br /> indicating an NPR value of 1.0 are considered PAG, samples between the lines representing an <br /> NPR equal to 1.0 and equal to 3.0 are considered uncertain, and samples above the line <br /> representing an NPR equal to 3.0 are considered non-PAG. <br /> 16 <br />