Miao ling group: main outcrops within the mining area and its South-East, rocks are mainly grey-dark gray fine-grained sandstone, siltstone and silty shale between crystalline limestone.
Miaoling group: mainly exposed in the southeast of the mining area and its lithology is mainly gray - dark gray fine sandstone, siltstone, silty slate crystalline limestone.
Miao Ling group: mainly exposed in the mining area and the southeast, lithology is mainly gray gray fine sandstone, siltstone and silty slate with crystalline limestone.