(die) Seife Placers or placer deposits are deposits of secondary origin. Through wheathering and mechanical (fluvial) transportation ores can be congregated and enriched. Concentrations of ores are usually higher than in the original rocks. Typical ores of placers would be those of tin, gold, platinum, niobium, tantalum, titanium, zirconium. Diamonds are also to be found in placers. (EDWARDS, R. & K. ATKINSON 1986, S.175ff).