Metal detectors and gold Minelab can help detect type objects, but not inform exactly They have a sorting feature that doubles:

• Iron Metal (Ferrous): Objects with lots of iron are usually garbage (e. g.: nails). Detectors can be set aside to ignore the signal of this iron object.

• Electrical Deliverer (Conductivity): Valuable objects like coins and rings are flowing with different electricity than garbage (like foil). This feature helps the detectors "guess" whether it might be garbage.

Remember, the sorting of sorting and signables are different in every model of Minelab, for details, check the manual or contact Minelab directly.