https://thehill.com/policy/energy-environment/4945872-arkansas-19-million-tons-lithium-battery-power/amp/
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The researchers said in their article released last month in the journal Science Advances they had "calculated that there are 5.1 to 19 million tons of lithium in Smackover Formation brines in southern Arkansas," making up "35 to 136% of the current US lithium resource estimate."