Description: Hunan manganese sediment layer bit lower Sinian liantuo Group, Upper Sinian Doushantuo lump Group, Middle Ordovician Brothers River Group, Lower Permian when the red group and the Upper Permian Changxing Formation other 10 layers. Fu existence of these groups of sedimentary rocks manganese carbonate or manganese exposed limestone surface after the hot and humid weather conditions in the supergene weathering by making further enrichment of manganese to form manganese province of the more important types. Such causes can be divided according to their manganese deposit cap, leaching and accumulation of three categories.
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