Jul 01, 2019 · Occurrence of manganese nodules, cobalt crusts, marine mud and phosphorites at the ocean basins, seamounts and continental margins in the oceans. Recent studies ( Hein et al., 2010 , Kato et al., 2011 , Bam et al., 2012 , Zhong et al., 2018 ) also indicate that significant REE resources are available in ocean bottom sediments.
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