by TeckXKnight » Tue Mar 29, 2011 2:50 am
Please use the search function, these questions have been asked a lot. You need to go in deeper to the cave before you can mine the walls. You cannot mine within a certain distance of the entrance.
You will need a pickaxe or stoneaxe equipped to mine and the speed and capability to which you mine is based on your equipment quality and your strength.