Offshore mineral resources include iron sands, volcanic massive sulfides and ferromanganese nodule deposits. The metal oxides are ferruginous with ferromanganese oxides, clays, carbonates, volcanic glass and pelagic sediments. Two manganese ferroalloys, ferromanganese and silicomanganese, are key ingredients for steelmaking. It is also associated with sedimentary and meta sedimentary rocks, manganese, ferromanganese and barite deposits. Some of these ferromanganese deposits form nodules encased within limestones. Ferromanganese nodules form in the oxidizing environment of the abyssal pelagic zone. The oxides undergo carbothermal reduction in the furnaces, producing the ferromanganese. Often ferromanganese (usually about 80% manganese) is the intermediate in modern processes. It also occurs in crusts of ferromanganese minerals on oceanic rocks. The resulting ferromanganese has a manganese content of 30 to 80%. Overlying this is the massive-finely laminated ferromanganese muds. Meanwhile, the Legal and Technical Commission reported progress on ferromanganese crusts. Ferromanganese nodules have been found in the bay. Silicon carbide and ferromanganese briquettes may also be added to the charge materials. The country's largest ferromanganese plant is situated on the outskirts of Garividi.