Pujue manganese ore lies in the mountains of Songtao Miao Autonomous County and was discovered by Guizhou provincial geology and mineral exploration bureau, the local government said in a statement.
It said the ore had a potential value of more than 100 billion yuan (USD 14.5 billion), state-run Xinhua news agency reported today.
China is the world's largest producer and consumer of manganese, widely in making batteries and magnetic materials.
Scientists have discovered four large manganese ore deposits in Guizhou Province with combined reserves of 600 million tonnes in recent times, said Chen Yuchuan, a geologist and academician with the Chinese Academy of Engineering.