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继中间工厂试验之后,1968年在皮奇矿山开始了地下浸出。研究和解决了溶液的注入、分配以及铀的提取问题。其中有的问题仍在继续研究。
Following the pilot plant trial, underground leaching started at Pitig in 1968. Research and solve the solution injection, distribution and extraction of uranium. Some of these problems are still under study.