My only concern is BRD - you can easily spend 10 levels there, maybe even a lot of time at 60 doing lava runs. That instance has a lot of Dark Iron Veins and those will quite likely be very sought after - but depends, is Thorium Brotherhood gonna be in phase 1?
Anyway, I see two options apart from skipping it and that is either at 48 or so before goind to BRD:
1) power level mining with your slow mount. Close to 50 mobs should give you no trouble, but the competition might be fierce and while you are leveling mining, the rest of your multibox setup is kind of idle.
2) splash some cash on smelting. You can get to 230 and the only really hard part might be getting to 125 using silver. You can do a quick stop in arathi for the bloodstone I think? To help bridge that gap.