Umm I'm having problems mining glafire in mobile version. I mean like where's the exact spot since I've checked all the ? Marks and there's no mine option
You need perception 14 or more to find the mining room/crawler nest area. It's in the second tunnel (uphill cave) in the most bottom right place of the cave. (first one being that one where you can build a camp.) If you're under perception 14 it says that it is a dead end.
You have two spots inside the cave crawler nest area, they are both near each other in the bottom right part of the area, both being marked by a question mark.