Why? Theres only a couple places you need to mine to.
*Edit* Sorry, I just read my comment and it comes across very snarky. Please help me understand the basis for your suggestion. Is there somewhere particular that you use the beams?
I use beams in mining part of Lost Cave, so you have an easier walk the other runs you probably do when done with one round. It's an easy place to get stat scrolls at lower ranks, and not having to mine that part, makes life easier when going more then 1 round.