What I'm trying to say is that if you're a beginner, there's no reason you can't find something useful. If the device is done right, it should be able to find almost any metal object. This includes silver, gold, iron, nickel, brass, copper, aluminum, tin, bronze, and lead. Keep in mind, however, that many artifacts are made of brass, metal or iron. In this case, a metal detector with a lower frequency is more likely to find better artifacts than one with a higher frequency, so be careful.