Okay, this might sound uh. Stupid. But I didn't realize I was supposed to be able to actually see in the mines. For seven hours. I only know now because I've seen other people post screenshots. I thought some of the darkened areas seemed darker than they should! I've since played with the graphical settings and such, but nothing seems to help. All I get is, well, this:
If I pull the camera aaaaall the way out and position it almost completely above my character's head, I can kinda make things out about 70% of the time. I thought I was just missing something, haha.