Miner's Hat of the Deep

Miner's Hat of the Deep is a Rare Bind on equip cloth head piece. It feature many different stats, but it is mainly suited to a Caster. Its in-game model looks a lot like a mining helm, with a working light. This is only cloth non-engineer miner helm, but after Cataclysm it is no more available because of Uldaman loot changes.

Source
It was a random drop off any mob in Uldaman before Cataclysm.