ASN General Discussion, page-18911

The entire area of Paradox and green river was a inland sea, so the source of the mineralized brines would be below the tested zones to date, this is why the company mentions replenishment of the zones to be produced from.
Based on this it is highly probably the the resource target is only a fraction of the actual source resource much deeper than the lowest drilled and to be drilled target zones that the company is quantifying.
If you must all know, I currently have it at 2 trillion dollars worth of ice, less over the long term as I suspect Lithium will have little value in the long term, but still a very valuable resource for hundreds of years to come from Bromine Boron and Iodine for the booming food additives for vegans and medical uses.