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<br />Page 2 <br /> <br />As to the impact of the peroxide treatment on the spi of tails, <br />the only change in the tails will result from the reduction of <br />wad cyanide components (weak acid dissociable elements-- <br />primarily copper) by precipitation as stable and insoluble <br />hydroxides which will settle to the pond bottom with the <br />tailings solids. We will perform routine metals analyses with <br />the wad analysis of solution samples to adequately verify this <br />conclusion. <br />Comment 2: The distribution lines will be tied to anchorages <br />along the pond sides with ropes. The lines will bO readily <br />adjustable and relocatable using these ropes. The techniques <br />to be used have been discussed and concurred with by the <br />peroxide technical representative. He stated that the method <br />envisioned has been successfully used in previous applications. <br />Comment 3: As to dispensing the reagent just below the water <br />level, further discussions with the technical representative <br />have set the delivery points at the surface. The peroxide at <br />a specific gravity of 1.29 for 70$ HZOZ is heavier than the <br />solution and will sink toward the pond bottom as added while <br />the reaction continues. He also stated that the reagent <br />dispersion throughout the pond is very rapid and can be <br />visually observed by a color change in the solutions as <br />detoxification progresses. The color which results primarily <br />from the copper cyanide to copper hydroxide reaction does not <br />persist and clears as the hydroxide precipitates settle within <br />a few hours' time. We will verify this by the sampling <br />discussed previously. <br />Comment 4: The tailings as discharged from the spigots contain <br />a considerable amount of heat energy from the grinding and <br />agitation systems. The available heat energy at the point of <br />deposition provides an open water area at the deposition beach. <br />Since this is the preferred location for the addition of <br />peroxide after initial pond detoxification, the open water area <br />adjacent to the beach will be available for the delivery <br />pipeline. <br />Installation of the Inco SOz/Air system will in all likelihood <br />be complete well in advance of pond freezing weather <br />anticipated to be in late November. This should make it very <br />unlikely that any freezing problem will be experienced. <br />We wish to again emphasize that we will continue to apply to <br />cytox reagent as at present to insure that all available, <br />