Location: This quest takes place in Elwynn Forest.
Shortly: Marshal Dughan in Goldshire wants you to explore Fargodeep Mine.
How to: Leave the town and run south-southwest. You will bump into Fargodeep Mine. Enter the mine and proceed till your quest is complete (which will be complete in the first opening room).
The Rewards are 1 silver, 75 coppers and 250 reputation with Stormwind.