Diablo 3 - A Miners Gold

"Where: Howling Plateau, Act II

Trigger: Speak with the Crazed Miner.

Mob Details: Fallen, Fallen Shaman

Completion Details: Protect the Crazed Miner.

The Crazed Miner wants to raise a chest that has been down in a pit, and asks for the player to defend him while he uses the lift. Fallen will spawn each time the Crazed Miner speaks (generally about how the lift is stuck) and do not pose much of a challenge. They rise from the ground in large waves, again, with each piece of dialogue the miner has. The second wave will raise multiple Fallen Shaman who, in turn, do what fallen shaman do: raise fallen that you have just killed and lob fireballs. The fireballs can be hard to dodge due to the shaman's proximity to the player, but they don't do much damage. A second wave of fallen shaman will spawn as the player is dealing with the first, and while the battle continues, the event will complete itself. The Crazed Miner successfully brings the treasure to the surface, which contains a Resplendent Chest, and the player is rewarded with both loot and the normal event awards." 

source: http://www.diablowiki.net/A_Miner%27s_Gold

Was looking for while, did find a few other things going on in the area 

1: A trap, a little girl needing help

2: A rare monster saying "blood dripping"

thanks for watching