American Battery Materials Inc (BLTH)

[Hrvat4]

Do they mean 1 million tonne of LCE in a single well or for all the wells combined?

Either way a large number, with more accurate data from other drilling coming later this year.
At projected 2023 Lithium Carbonate prices - $19,000/Tonne USD - that means they have $19 billion to extract over the next decades. and that is just accounting for the lithium.

I don't think lithium is going to get much cheaper as time goes on.