There's rumors here in Western NC that local mining company Piedmont Lithium (PLL) is in talks with Tesla. That would make sense, I actually brought this up here over a year ago.
And there's an article about Tesla on a Piedmont Lithium-sponsored marketing site here
Piedmont Lithium Limited (NASDAQ: PLL). Hmmm.
Company website is here
Piedmont Lithium Limited (PLL)
Another take on this:
If this is true, I'd expect an announcement on Battery Day.
Full Disclosure: Bought a little bit of PLL, as Jack Rickard would say, "for fun".
Not an advice.