https://seekingalpha.com/article/4127448-cobalt-cliff-two-dire-warnings-musk-soliloquy

Cobalt is a possible by-product of copper mining at Hay Mountain. Only "possible," — not much is known yet. No one is asserting that cobalt will be a by-product.

However, given the growing concern about cobalt it's, easy to see that the mere potential of its presence at Hay Mountain might be sufficient to initiate a converation.