That sounds better than what I always did in quarry holes......and I already have a Mining Well running. It brings in enough Cobblestone to feed the Miner, if I use the latter sparsely. The thing with the Miner as of now, is that I can only dig up stuff accesible by a Stone Pickaxe, which means it probably skips a few useful ores. The Mining Well, on the other hand, digs up everything.
Hopefully, I'll avoid going all-out with Quarries this time 'round, but I guess I'll end up with a pretty big hole anyway. Oh well, time to create something spectacular with the holes. I'm considering a base on pillars instead of floating in the sky. Or maybe I'll simply make a roof over it and build my base in the eternal gloom of a large cavern. Either way, I think I'll have loads of fun.
Thanks a bunch!
I would just fill them with Railcraft Tanks, and have them mainly filled with lava (as lava power = only power in IC2, unless you have advanced solars)