Speed Up Cobalt Ore Farming
The first step is to learn Northrend Mining, you can learn it from Jedidiah Handers at the old Dalaran. (41.46, 25.78)
Cobalt Ore farming can be done in many places and I have found 2 places to farm them.
To speed up the farming you can use:
Darkmoon Firewater: Allows faster gathering of resources and slightly increases your size for 1 hour (5 min. cooldown)
Cobalt Ore Route 1 – Grizzly Hills
This is the easiest farm to farm Cobalt ore, because there is not many farming in this area.