Classifies manganese oxide ore deposits of Brazil into three types--original sedimentary beds deposited contemporaneously with the enclosing rocks, as at Morro do Urucum; beds intercalated in itabirite which underwent regional metamorphism and subsequent concentration by weathering; and deposits derived from the near-surface weathering of manganese silicate-carbonate-sulfide protore, as at Morro da Mina.

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