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淡水河谷表示，这是一项预防措施，这是由于需要加强矿坝的安全管理，以及需要进一步提高对岩土结构、属性的了解程度。DicoLeste矿坝曾在2020年3月发布了积极的《稳定性声明》。但是，在近期经历了重新评估后，结果变为负面。
正如淡水河谷第一季度产销报告中所述，DicoLeste矿坝的一级紧急预案的启动不会影响其2020年的目标生产计划。
