Or, if you're like me and play several different toons, have one as a engineer/miner, one as an enchanter/miner.
My setup during CB and OB worked like this:
Toon1: Hunter Leatherworking/Skinning
Toon2: Rogue Skinning/Mining
Toon3: Paladin Blacksmith/Mining
One toon acted as a "feeder" for my other two while my main crafters were simultaneously gathering as I played them as well. I played each regularly and it goes without saying that both my Blacksmith AND Leatherworker were capable of making armor/weapons that were FAR beyond my current capability of utilization.
I made a fricking fortune.