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• i flow of sulfur dioxide will automatically shut off. Sulfur dioxide will be purchased and stored in a t t,400yallon-capacity storage vessel Air will be added to the reactor through several air lances located near the bottom of the reactor. The reactor will be equipped with a large agitator to maintain un'rformity and to assist in transferring oxygen from the air. A spare compressor will be installed to back up the air distribution system. Lime wtll automatically be added to the reactor to maintain a pH of between 8 and 8.5. Lime addition will be controlled by continuously monitodng pH The reactor will be equipped with a two impeller hydrofoil turbine to provide vigorous mbcing. The flow of tailings in the reactor will be down the middle and up along the sides. The treated slurry will overflow near the top of the reactor and will gravity flow into the existing tailings pumpbox. The treated tails will then be pumped to the fallings Impoundment where they will be deposited using thin layer deposttion techniques. Deposition methods will not deviate from those currently being employed at the San Luis sRe. The INCO SOz/Air reactor will be located east of the existing carbon-iMeach area. Sulfur dioxide and lime storage vessels will be located south of the leaching as shown on Figure 2. The entire reactor area will be located on a concrete pad and surrounded by a 1.5-foot-high concrete curb to provide secondary cort[alnment (Figure 3). The curbed area will be sloped towards the northwest corner of the containment area where a sump will be located. A pump in the sump will return fugitive solutions to the reactor. The reactor secondary containment area will Abe connected to the carbon-in-leach secondary containment area to provide additional secondary containment capacity. The sulfur dioxide and lime storage vessels will not be provided with secondary containment. Lime will be stored as a slid preluding the need for secondary containment. Sulfur dioxide will be stored as a liquid; however, the material flashes to a gas at atmospheric conditions, precluding the need for secondary containment. BMR has comracted wRh Kllborn Engineering to provide process engineering support for the INCO SOz/Air system. Kilburn was selected based on their recent experience and familiarity wRh the INCO SOZ/Air system. Kilburn has provided similar process englneedng support for three INCO recent successful SOZ/Air operations. 25301/RNt)e10.RPT INCO SOZ/PJr Technical Revision Page 7 June 16, 1992 San Luia Mins