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• • .Anal r~;i~ r~/(-rdrgJ(•s <br />~sitive i be noted that the Irec cy:uticfe unalysi, is often too high, due to interferences <br />loin i associated with the tiu:uion method in mining solutions. In xome case. the Iree <br />cyanide Icvel ix higher dvut the wad cyanide level which is not possible. <br />ethod. The difference between the weal and wad cyanide values ix 25 m/1. The onl}• maul <br />ix not cyanide complex nl' the three mentioned [hut does not report in the u•ad procedure <br />is that of iron. which only reports m the rota! cyanide analysis. Therefor, the <br />correspond;ng iron concentration present in tfte solu[ion should be a[ about 9.U m~,/I <br />tential {i.e. U.36 z 2S mg/11. <br />is an <br />Assuming the free analysis is correct, about 5U mg/I of the wad cyanit{e is <br />complexed (i.e. 175 ntg/I - 125 m`/I = SU mg/I1. The corresponding copper and <br />mrnts: nickel concentrations should be 34,0 mg/I and 5.0 mg/I, respectively, These two <br />~ metals' concentration correlate to a calculated wad cyanide level of 5U mg,/l. As a <br />result, it appears the ntetais and cyanide values are self consistent. and the anAlyses <br />;tee reliable. Differences i,t [Ire calculated and actual cyanide levels of IU-?0 percent <br />are common wi[h metallurgical solutions. <br />2.6 REFERENCES <br />ASCI/SRK, "An Evaluation of the El•fectiveness of Rinsing Procedures on Cyanide <br />eting a Removal from Spetn Heap Leach Ore; Brahm Mining Corporation. Load. South <br />nm the D;tkotu, USA", for State of South Dtskota, Sep[ember 1990. <br />ASTM. Section II, Water and Environmental Technology, Volume I I.U_'. 1985. <br />cyanide <br />;CN},1• Barton, P., Hammer. C.A., and Kennedy. D.C., "Analysis of Cyanides in Coke Plant <br />nide is Wastewater Effluent*". Journal Water Pollution Control Federation. pp. 13~-239. <br />tr main 1978. <br />to the <br />Based f3rickcll, R.H.. "Chemistry of Cyanide Solutions". Presented at Cyanide and the Gold <br />o(each Mining Induury: A Technical Seminar, sponsored by Environment Canada and <br />Canadian Mineral Proccsatrs. 1981. <br />Conn. K., "Cyanide Analysis in 1~1ine Effluents". Cyttnitfe and the Gnld Mining <br />Industry: A Technical Seminar. Ottawa, Ontario, 1981. <br />Csikai, NJ. and f3umard. A.A..lr.. "Determination of Total Cumidc in <br />:clarion Thiocyamuc-Conutining Wastcu:ucn". Analytical Chemistn~, VoL 55. p, 1677. 1983. <br />.should <br />a3 Ch,rprn~ Tern <br />