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`~ <br />oxidation, indicated that the fraction of ~~~lnhur oxidizer xreased as sulphur content increased <br />(Table 4). Nonethelbs.., e• ~ L ) uver . . of t~ .phut present was oxidized.- ' <br />Hel NP bated on NAP <br />2D <br />0 ~ <br />-20 <br />-40 ~ <br />-60 ~ <br />-80 <br />-100 ~ <br />-120 <br />-1fi0 -140 -120 -f00 -eD -60 -40 -20 0 <br />Ir et NP based on mine]a logy <br />Fig 2. Compazison of NAP and Mineralogic Net NP values <br />If the residual sulphur occurred as an acid-producing mineral, such as pyrite or pyrrhotite, <br />theactual APP of the sample would be about 54'0 less than the true value. This deviation would <br />not account for the discrepancies observed in the Net NP values observed. <br />Table 4. Extent of sulfide oxidation in the NAP Test <br />Sample Head Percent Residue Percent Percent Oxidized <br />RK4 3.48 0.07 98 <br />TLl 1.06 O.OI 99 <br />TL3 2.30 0.04 98 <br />TL6 5.84 0.27 95 <br />154 <br />