Part of the quest is have a production value of 1200/12hr of Gold. Reward is 1040 XP. Now work out what its going to cost, you need 2 gold smelters one at lvl 3 one at lvl 4.work out the cost of building them and then upgrading to lvls 3/4. Then they need buffing to achieve the goal. Its just not worth it, I think someone at BB seriously miscalculated this one or maybe meant to type 120 per hr and mistyped an extra 0.