Bodysurfer,  my guess is just as good as yours, but "me thinking": 

 If split to occur at $20 a share, then I would assume LACAr would cost $12 and LACam $8 .

 LACar as producing miner would accelerate its share price in 6 months to possibly $18, but LACam  will linger the first year under $10, though with T-P construction by 2025 it would move up also, $20 - that maybe pre-production price.

Of cause by 2025 LAC Argentina  with 40Kton of Li can also go as high as mid $30-s.

 Conservative?