Fusui bauxite mining area is located in the core area of the southern bauxite metallogenic belt in Guangxi,and there is a large amount of volcanic ash.In order to further analyze the volcanic ash and its significance to mineralization,field geological survey,laboratory microscopic identification and X-ray diffraction analysis were used to study the volcanic ash.The results show that sedimentary bauxite can be di-vided into three types:massive,clastic and dense.The accumulated bauxite is the product of weathering and accumulation on the surface of sedimentary bauxite,which inherits the ore mineral and structural character-istics of the former.The types of volcanic ash in bauxite ores can be divided into 4 kinds of rock debris,crys-tal debris,glass debris and volcanic dust,basalt,andesite debris,feldspar,quartz and other basic-medi-um-acid minerals.Volcanic ash bauxite is strongly mineralized,which often produces hydrobauxite,kaolin-ite,hematite and other fine minerals,the total content of ore is more than 50%,which is an important mate-rial source of bauxite.
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