InterestingArticle If you ignore the advertisement for the company
..."Although it’s less expensive than hard rock mining there’s a limit to annual production from a brine source. This is based on the volume of water in the salar and the availability of an alternate water source to replace what’s pumped out.
“You can realistically pump out only as fast as new water comes in and replenishes it. Also with the brines your grade slowly depletes,” Schellenberg said..."
https://www.bnn.ca/lithium-market-small-but-complex-1.544007
https://kirillklip.blogspot.ca/2016/08/the-lithium-boom-goes-on-chinas.html