FAKE NEWS...LOL
Appalachia deposits are largely classified as undiscovered, but based on requisite knowledge from other pegmatite deposits and assay results combined with lithium prices, the potential mineable result has been determined by USGS. This has a LONG way to go before anything is done with it.
There's already proven resource under full development in the Smackover Formation in AK. It is of significantly greater quantity and more easily accessible because it's brine, so it's drilled utilizing standard petroleum drilling equipment and techniques. The lithium carbonate is extracted from the fluids using a new DLE (direct lithium extraction) technique and the mined waters are reinjected back subsurface. No evap ponds, no blasting, crushing, roasting, leaching, refining. DLE is really the quickest and most efficient way to get battery grade lithium quickly.
USGS from 2019: https://www.usgs.gov/news/national-news-release/unlocking-arkansas-hidden-treasure-usgs-uses-machine-learning-show-large
Update from last week: https://www.juniorminingnetwork.com/junior-miner-news/press-releases/2118-tsx-venture/sli/201753-standard-lithium-reaches-major-operational-milestones-at-arkansas-demonstration-plant.html
Standard Lithium have entered a JV with Equinor and Exxon are also in there.