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K E A P A C I F I C <br />.--.x. •nn~s--: . <br />• the average sulphur level of about 7.68% as S comprises of at least 85% <br />sulphide (pyritic sulphurl; <br />• the average ANP values are low at about 10 T/KT CaC03 equivalent; <br />• on rinsing, there is a relative increase in the amount of total sulphur and <br />sulphide sulphur remaining in the rinsed solids, while the ANP decreases to <br />about 75% of the initial unrinsed value; and <br />• overall ANP/AGP ratios are about 0.2:1 unrinsed and 0.15:1 rinsed, which <br />would be considered potentially acid generating and, perhaps, strongly so. <br />These data indicate that kinetic testing would be required normally .on all samples. <br />However, there are sufficient data from the site already to indicate the general behaviour of <br />these tailings and the samples within this group tend to be similar. <br />Accordingly, it is necessary that only a few of the samples be subject to Winetic testing as <br />they can be seen to represent the group as a whole, due to the relative uniformity of this <br />group of samples. As such a 'typical' sample which has average ANP/A(oP ratios for the <br />rinsed and unrinsed cases, along with the 'worst case' sample from the group are <br />appropriate for additional kinetic testing. <br />Specifically, sample 1114: 15 - 26.5' for the typical sample, both rinsed ar~d unrinsed, and <br />sample 1116: 35 - 45', both rinsed and unrinsed, for the 'worst case" sample would be <br />suitable for kinetic testing, giving four samples in total for kinetic testing. <br />Analyses of Tailings Pareiluid <br />The results of analyses of tailings porefluid have been summarised in Table 2, lattachedl. <br />The small volume of fluid that could be retrieved restricted the usefulness of the samples <br />and their resulting analytical data in two ways: <br />• most importantly, the small sample volume meant that the samples could not <br />be filtered. As a consequence, adding acid to preserve the sample merely <br />resulted in all the particulate matter in the sample being disselved. Normally, <br />tailings porewaters carry very high levels of suspended solidds. As a result, <br />the analyses bear no relation to the actual composition of any leachate or <br />10403161 <br />