Oxidized cobalt ores also belong to the complex ore group. They are formed during surface erosion of cobalt- and nickel-containing hyperbasic rocks or sulfur ores. In both the first, widely distributed type (silicate-nickel ore; about 0.1 percentcobalt), and the second, rare type (oxidized sulfur ores; 1–4 percent cobalt), the cobalt is usually concentrated inmanganese hydroxides (asbolites) of variable composition, with which cobalt hydroxides and carbonates combine in thezone of oxidation. Silicate-nickel ore deposits are found in the Urals and in Kazakhstan (USSR) and in Cuba and NewCaledonia; sulfur ores are found in the copper deposits of Zaire (Africa).
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Oxidized cobalt ores also belong to the complex ore group. They...
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