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<br /> <br />' 1 number is conservative. <br />196 <br /> 2 With respect to the sulfuric acid <br /> 3 d <br />th <br />liti <br />i <br /> me <br />o <br />s, vo <br />zat <br />on of the hydrogen cyanide, we <br /> 4 have done test work. We have shown that this method <br /> 5 works within this tailings system. There are other <br />' 6 methods of detoxification and one of the witnesses <br /> 7 who testified today recognized one, the hydrogen <br />' 8 peroxide method. <br />' 9 We have no assurance that that will <br /> l0 work. It is a multi-stage process that requires <br />' 11 careful control to get both stages to react to <br /> 12 destroy the cyanide, to get rid of the cyanide. <br />' 13 The downside of using peroxide, it does produce <br /> 14 oxidation products whose chemistry we don't: know and <br /> 15 i <br /> may result <br />n enhanced metal mobilization '_nto the <br />' 16 tailings. <br /> 17 The other common method of detoxifying <br />' 18 cyanide in tailings is using the outline <br /> 19 chlorination method. That has been in use. <br />' 20 It's <br />i <br />t <br />b <br />th <br />f <br />f f <br /> go <br />ecauser. <br />ng ou <br />o <br />avor <br />e <br />ree <br />' 21 chlorine generation in the process reacts with the <br /> 22 residual components -- not components -- oz•ganic <br />' 23 materials in the tailings to produce chloro-organic <br /> 24 compounds which are considered to be, I think, far <br />' 25 more toxic than the trace metals you would get in <br />AGREN, BLANDO b BILLINGS <br /> <br />