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Description:Preliminary surveys by dredging and bottom photography of the submarine slopes and terraces of the Hawaiian Archipelago between the Midway Islands and the island of Hawaii have been made to determine the extent and metal composition of ferromanganese deposits of possible economic importance. The Fe-Mn oxide deposits studied occur mostly at depths of 750-2000 m in the form of stains, encrustations of differing thicknesses( up to about 2 cm), and only rarely as nodules. A variety of solid substrates, including carbonates, have accumulated Fe-Nn oxides, but the thicker deposits are found mostly on altered volcano-clastics and basalt. The principal metal of economic interest in Hawaiian waters is cobalt, which is present in concentrations four times higher on average than in deep-sea deposits and the cut-off grade for recoverable continental reserves. Nickel and manganese are of potential secondary interest.
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Sea Grant Document Number:HAWAU-T-76-008
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Rights Information:Public Domain
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