I made a video explaining how to farm the chest in Hellfire Ramps when it is not locked. See attatched file.
First off, this wil only work if you have WoWInfinity.
Take off your clothes to avoid durability loss if you die.
Target one of the mobs sorrounding the chest and hit them with Icelance
Jump back down and wait for about 2 minutes.
When you see the mobs coming, jump on top again and cast invisibility.
Open the chest, loot, go out, reset, repeat.
I apologize for my shitty video editing skillz.
http://www.vocley.com/magefarm.wmv