Few shots from the inside of my mine, not really much to look at as I've spend most of the time deep down trying to find iron and stuff.
Emergency exit to the boat shack
Secondary exit, I made 2nd floor to the bunker which entrance can be seen in this one
Stairs leading 41 blocks down to my mine
And the current state of my 20x14 mine, going down layer by layer
EDIT: Is there somekind of restrictions on rarer materials that you have to use a pickaxe made out of certain material to mine it? I don't get anything from Redstone nor gold block with my stone pickaxe.
EDIT2: Nvm, found the answer, iron pickaxe or better needed.