If a card says to deplete all sources on a tile while you are gathering fossils, is the mountain terrain covered too?

Question

Accepted Answer

Yes. When the action is gathering fossils, the terrain icon is covered too and treated as unexplored. For an exploration or an event, only the food and wood sources are covered, unless the card names a terrain type.

Robinson Crusoe: Adventures on the Cursed Island

If a card says to deplete all sources on a tile while you are gathering fossils, is the mountain terrain covered too?