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Litorânea s. Palavras-chave: Plataforma Continental; Minerais Pesados. Marine placers Marine placers are located on present beaches or are related to the Quaternary sea level oscillatory events, which exposed large areas of the continental shelf or covered portions of the coastal plains. The transgressive sea level events drowned alluvial and colluvial deposits including important heavy minerals concentrations further reworked by current and wave action. This mechanism promoted the re-concentration of the denser minerals such as ilmenite, zircon, tin, gold and diamonds. The main exploration activities of marine placers are located on Namibian and South African continental shelves, for diamonds, and on the Southeast Asia, for tin.