Now that is a question with a completely non definitive answer -...

Now that is a question with a completely non definitive answer - knowing the answer to that is a 10+ bagger question!

The current state of play is no clay hosted REE project in WA has achieved "good" (50%) magnet ree extraction at pH 1, let alone pH 4 (keeping in mind pH 1 is 10x weaker than pH 0, and pH 4 is 10,000x weaker than pH 0). All the good extractions reported to date have been pH 0 in WA. But, geology is a fascinating beast and there are always anomalies and outliers. I have way too little understanding of the geology of Jupiter to be able to comment on the probability of pH 4 leaching working. If it does though, I would guess a $500m mcap would be easily achievable and I would be loading up my boots on open.