Kiena Mines process a free milling gold ore containing 4.21 g/t Au, 3.1 percent pyrite and 0.4 percent pyrrhotite. The throughput has been increased by 40 percent by tight control of the leaching parameters. The limiting factor of the process is the retention time in the leach circuit. A study was initiated to evaluate the level of control of parameters (grinding size, dissolved oxygen, pH, free cyanide and lead nitrate) to optimize the circuit efficiency. It was found that oxygen and lead nitrate addition are important to maintain gold extraction, while decreasing processing costs. The results indicated that some control levels could be modified. Some results are discussed in relation to models developed. An implementation strategy was elaborated. A decrease of reagent costs is expected after implementation of these changes.
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机译：Kiena Mines处理一个含有4.21g / t Au，3.1％黄铁矿和0.4％Pyrhotite的自由铣削金矿。通过对浸出参数的严格控制，吞吐量增加了40％。该过程的限制因素是浸出电路中的保留时间。开始研究，评价参数的控制水平（研磨尺寸，溶解氧，pH，自由氰化物和硝酸铅）以优化电路效率。结果发现，氧气和硝酸铅加入对于维持金提取是重要的，同时降低加工成本。结果表明，可以修改一些控制水平。有关开发的模型讨论了一些结果。阐述了实施策略。预计这些变化后预期试剂成本的降低。
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