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REP18954
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Last modified
8/24/2016 11:47:44 PM
Creation date
11/27/2007 2:32:13 AM
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Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Report
Doc Date
9/22/1997
Doc Name
ATTACHMENT 4 COMMENTS FROM DR ADRIAN SMITH OF KEA PACIFIC
Media Type
D
Archive
No
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K E A P A C I F I C <br />seepage which might exit the tailings, where the suspended fraction of the <br />porewater would not be present; and <br />• in two of the tailings samples the small sample volume prohibited the <br />analysis of the fluids for total cyanide, although it was possible to analyses <br />all five fluids for weak acid dissociable (WAD) cyanide which, in this context, <br />is the more meaningful of the two determinations. <br />Within the bounds of such analysis, the general cyanide and major ion data are similar and <br />show the following: <br />• relatively high levels of sodium, calcium and potassium in the porefluid, not <br />untypical of tailings porefluids where all the suspended solids fraction and <br />particulate matter have been dissolved. Clearly, the dissolved levels of some <br />species, for example calcium, are far above that which would be seen in true <br />solution in tailings systems, where the solubility would be ccontrolled by the <br />solubility product of calcium sulphate; <br />• very low levels of WAD cyanide in four of the five samples , (0.05 mg/L or <br />less), with about 0.6 mg/L in the other sample; and <br />• where available, the total cyanide values, which include the stable iron <br />cyanide complex, are low. One value is about 5 mg/L while the other two <br />values are less than 1.3 mg/L. <br />Many of the trace metal species are either entirely or essentially absent in the porefluids, <br />despite the solution of particulate matter. Specifically: <br />• arsenic, mercury and selenium are below detection in all porefluids; and <br />• cadmium, chromium and silver are essentially absent in the porefluids or at <br />de minimus levels. <br />Further, the levels of barium, boron and lead, nickel are low in all the samples. <br />As would be expected for gold tailings where particulate matter from the porefluid has been <br />subject to acid solution, iron, manganese, molybdenum, copper (from catalyst use) and zinc <br />are all present in the porefluids. The levels of these species are far higher than could be <br />1003161 <br />
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