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The deep-sea metalliferous sediments and Fe-Mn polymetallic nodules formed in modern environment at the deep-sea ocean floor (> 4000 m depth) were evaluated as promising new raw materials, especially for critical elements as Li, Co, Cu, Mn, Ni, and rare earth elements (REE). We use - selective sequential leaching procedure to study the distribution of main and trace elements in sequential leached phases from deep-sea polymetallic nodules and sediments from the eastern part of the Clarion-Clipperton fractures zone,...

The increased demand for raw materials requires to reassess some deposits that were not of economic interest in the past. Complex of modern geochemical and mineralogical methods (SEM-EDS, LA-ICP-MS, QUEMSCAN) are used to study the ore mineralization in the small scale Pozharevo manganese deposit, Western Srednogorie Zone, Bulgaria. The deposit is formed in the contact zone between Late Cretaceous andesite pyroclastic rocks and overlying volcanogenic-sedimentary rocks. Manganese mineralization forms colloform textu...