In granitic terrain with tailings piles, what would be a good indicator of gold-rich veins in the subsurface?

• A. Antimony
• B. Arsenic
• C. Mercury
• D. Copper

Answer: (B)

In granitic terrains with hydrothermal gold systems, arsenic serves as a reliable pathfinder element because gold often occurs with arsenic-bearing minerals like arsenopyrite. Arsenic behaves zoneally in fluids and tends to migrate and accumulate in soils and stream sediments above buried gold-rich veins, creating detectable geochemical halos that point toward subsurface ore bodies. This consistent association makes elevated arsenic a strong indicator of underlying gold veins, more so than the other elements listed, which may only be locally or less reliably linked to gold in these settings. Antimony can occur with some gold deposits, but its association is not as universal; mercury and copper are linked to other ore types and geologic environments, so they’re not as dependable for signaling gold-rich veins in granitic terrain.