When I went in the mines I sometimes saw a big gap in the wall left of the ladder. I tried walking through it but it was nothing. I was wondering if somebody saw it too and I question if I should use a bomb on it. (I have never used a bomb before) edit: I don't have a screencap of it sorry (just saying it in advance)
I know what you're talking about. I'm pretty sure it's just a decoration, but feel free to try and bust it open. There are a bunch of secrets in the game yet to be discovered.