Exxon Mobil Corp. has never talked specifically about its lithium plans, because they’re still in very early stages.

But Chief Executive Officer Darren Woods is now sharing a few early details, after analysts raised the question during a conference call Friday to discuss the company’s third-quarter results.

Read More: Exxon in Talks With Tesla, Ford, VW on Supplying Lithium

The opportunity to produce lithium in the Smackover Range, in Arkansas, is looking “more and more promising,” Woods said.