From abstract: Radioactive manganese deposits have been found in two swamps and at one locality on the northeast bank of the Rio Itapicuru near Mosquete, municipio of Itapicuru, State of Bahia, Brazil. The occurrences are related to warm springs and consist of surficial manganiferous sinter and of sandstone impregnated with manganese.
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Added Title:
United States Geological Survey Report 567
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From abstract: Radioactive manganese deposits have been found in two swamps and at one locality on the northeast bank of the Rio Itapicuru near Mosquete, municipio of Itapicuru, State of Bahia, Brazil. The occurrences are related to warm springs and consist of surficial manganiferous sinter and of sandstone impregnated with manganese.
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Haynes, Donald D.; Mau, Henry & White, Max Gregg.Radioactive Manganese Occurrences in the Lower Rio Itapicurú Valley, Bahia, Brazil,
report,
April 1958;
Washington D.C..
(https://digital.library.unt.edu/ark:/67531/metadc502173/:
accessed August 10, 2026),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.