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In order to explore Fe minerals in Three-Coloured Beach, we investigated the effect of sediment particle size to leach of Fe in the each of geochemical fractions.The bulk and fine grained sediment samples were leached of Fe using the optimized BCR microwave method. The both of bulk and fine grained filtrate samples were measured of Fe in each of fraction in sediment by AAS. The optimized of BCR microwave method revealed the accuracy (⁓ 90%) and precision (RSD <30%) of leached Fe in both sediments measurements. The total concentrations of leached Fe in bulk sediment were lower two times compared with those in fine grained sediment due to the affect of reaction rate of a chemical reaction. The same patterns of explored Fe in the geochemical fractions from the sediment fraction 1 (mobile fraction) to fraction 3 (oxidisable fraction) as stated non resistance sediment fractions showed lower portion of Fe compared with the Fe levels in sediment fraction 4 (residual fraction) or resistance sediment fraction. It indicated the bulk and fine grained sediments in Three-Coloured Beach were categorized the enrichment of Fe in natural sediment.