Like all Dowsing, you need to program yourself (your mind) for what your looking for. Is it raw gold, panning in streams, in the mountains looking for vein Gold or the beaches searching for Treasure Gold?
There are many great books available that describe where historic ship wreaks took place & where Treasure Gold & Silver has been found. Knowing what your looking for is part of programing your subconscious mind. The focused image in your mind is a large part of Dowsing.