Dragonbrain

By casting this spell, you can detect accumulations of gold, whether worked or unworked. The spell will detect everything from a vein of gold ore to a pile of gold coins, as long as it contains some amount of gold. It also grants advantage on perception checks to determine the presence of hidden treasure in the form of gold or precious gemstones.
If your material component is unworked, you will detect only unworked accumulations of the metal, such as ore deposits and mineral veins. You will only detect worked metal, such as gold coins or gold armor, if your sample is likewise refined.
The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.