The high aluminous meta-claystones are thinly bedded to metasedimentary rocks which belong to Chununsan Formation. Major high aluminous minerals in the ores ae andalusite, kaolinite and pyrophyllite. The other significant constituents are sericite, chloritoid and carbonaceous material, etc. Ores can be classified into 4 types according to mineral compositions; andalusite- kolinite-sericite, andalusite-kaolinite-chloritoid, kaolinite-sericite-pyrophyllite, and kaolinite-chloritoid-sericite ore. The formation of ore minerals are resulted from sedimentary, diagenetic, metamorphic and hydrothermal processes. Andalusite are formed by low-grade metamorphism under the conditions of 400~500℃ and below 4kb, from the view-point of mineral stability field, illite-mica crystallinity and graphitization degree of the carbonaceous material. Andalusites are partly altered to kaolinite, forming major mineral phase in the ores.

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