040114 dungeon-keeper resources gold
Gold accumulates automatically in your claimed Gold Mines. To collect the accumulated gold, just touch the mine. Arguably, of the four collectible resources, Stone is currently more valuable than Gold. 

The amount of gold you can store at a given time is limited by your Treasuries, Gold Mines and Dungeon Heart.

The maximum amount of gold a dungeon can hold is 13,401,500:

You can also earn gold by Raiding, and is dependent on how much damage you perform, and the level of your opponent.

There are several ways to spend gold: