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<br />I <br />2. BMR Commenced technical discussions with <br />consultants and suppliers on March 17 and developed <br />a phased three step process to red a cyanide <br />concentrations in the tailings pond. <br />3. Two primary goals: <br />a. Immediate reduction of potential wildlife <br />hazards <br />b. Attain criteria identified in the ~ermit <br />B. Initial Detoxification Step: Cytox (Zinc Ferro~s Sulfate) <br />1. Advantages: <br />- Readily Available <br />- Could be added to tailings directly - little <br />additional construction necessary I' <br />- Could attain relatively rapid re~uction in <br />free cyanide levels in tailings po d <br />2. Disadvantages: <br />- Only removes free cyanide, there ore not a <br />long term solution <br />3. Status: Cytox detoxification (TR-004) <br />Submitted - April 3 <br />Approved - April 7 <br />Implemented - April 7 <br />4. Results: Free cyanide reduced to nonhazardous <br />levels <br />C. Interim Hydrogen Peroxide Detoxification <br />1. Background: Feasibility studies indicat~ that the <br />3. Results: See Attachment <br />Into-SOZ Process was best suited to the acility. <br />- Lead time - four months minimum <br />- Therefore interim system was neede to reduce <br />WAD and cyanide pond concentrations <br />- Hydrogen Peroxide selected as interdim system <br />2. Status: TR-007 "Tailings Cyanide Deto lfication <br />using Hydrogen Peroxide" submitted on Ma~ 26 <br />- TR-007 Approved on June 12 <br />- Hydrogen Peroxide Detoxification commenced on <br />June 15, 1992 <br />