A newbie here w/ a Tesoro-Vaquero

[chinchilla1]

Hi folks..Well practiced today with my detector I got yesterday. I don't quite understand if it is suposed to detect things other than silver/gold? I had it set for the highest discriminant and 3/4 sensitivity and and really sang..in a small foot diameter area. But I dug down 9-10 inches and only came up with rock. If anyone can explain..can it detect say arrow heads or indian tools because some stones looked flaked. Also when it makes the loudest noise is it within the whole area of the coil or can it pinpoint it right in the middle. Thanks