Lopez Obrador vowed to keep lithium resources in the state's hands after suffering a blow earlier this year with the rejection of an electricity reform proposal.
Volcanogenic massive sulphide deposits have been a core source of copper, zinc and sometimes gold mineralization for over 150 years and remain the mainstay of some major mining camps worldwide.
The surge came from the nearby Conchas Norte mine, which closed due to flooding in 1996 and has since accumulated nearly 2 million cubic metres of water.