even with the presence of different layers of soils, you really dont know if you are on the exact spot until you hit it. meaning, you could be on the exact spot, 5 meters away, 10 meters away, 50 meters away, 100 meters away from the spot where there is gold. we really do not know. its best if you have a drill. for 65 feet, you can finish drilling in 1 to 2 days.