The deal comes after a trip by the Guinean mines minister, Abdoulaye Magassouba, to China and follows other major Chinese investments in the resource-rich West African nation.
Lithium needed for rechargeable batteries used in high tech devices and electric cars might soon be extracted from calderas surrounding dormant supervolcanoes.
Flash floods have left one worker missing and caused extensive damage to a power plant at the miner's operations in the eastern-most province of Papua.
Israeli diamond billionaire Beny Steinmetz, four others, in custody of Israeli police on suspicion of fraud, forgery, obstruction of justice and bribery.