http://www.kiya1.de/images/Div_mine2.jpg.html

the cave-in might be hard to see - after you have seen Eolus in the scrying vision, the cave-in should be open (flag on the link.

http://www.kiya1.de/images/Div_Dwarvenmin3.jpg.html

see? Now it's open. Before you got the quest and spoke to Eolus at the Axe memorial it was closed. Please, try again.