Lithium carbonate is selling at market for $6,600 a tonne. The operational cost to process the brine ranges from $1,400 to $3,000 a tonne. Averaging $2,200 a tonne.
6,600 - 2,200 = $4,400 a tonne profit or 66% profit margin.
Now whether that translates into a 66% Operating Margin still remains to be seen.
Side bar, here's nice read on future energy sector needs: