Can the Salt Deposits Invader Card be removed or discarded from the Invader Deck?

Can the Salt Deposits Invader Card be removed or discarded from the Invader Deck?

No, the only way it can leave the Invader Deck is by being advanced out of the Explore Space into the Build Space at the end of the Invader Phase in which it was revealed.
In particular:
  • If you would Accelerate it out of the deck, instead discard the next Stage II card underneath it (or the top-most Stage III card if there are no Stage II cards left).
  • Visions of a Shifting Future can't bury it to the bottom of the deck (since it's specially placed during Setup), but can shuffle it to take a chance at delaying it.
  • The Past Returns Again can't swap it with a card in the Invader discard.