A good question - does lithium lie beneath flat ground?
No, according to some sniggering neighbours boasting of their ridges of drill-ready Li outcrops. Bastards.
May I suggest sourcing Google earth or a topographical map of the tenements to determine the variation in surface relief overall. Doubt its dead flat.
As for characteristics of lithium strikes & distribution you may get info over at other Li stocks. Most mining stocks have a resident specialist happy to provide info.