You should use their own judgment about how to distinguish which aims to dig and what to leave. This comes with practice and experience. Discrimination of any kind, whether electronic circuit or audio sounds coming from the target, has limited accuracy. The target depth and degree of mineralization of ground in this particular place can confuse any discriminator.
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In some places, you'll want to dig up each goal. In other places where a lot of garbage, you may find it more productive to differentiate its objectives of sound and/or in combination with electronic detecting discrimination functions. In this case, you must balance the need to leave some small pieces of gold behind, not wanting to dig a full bucket of garbage and useless goals of iron; and, therefore, less gold.
If you are in doubt, dig it! Or at least throw your sample nugget down and get a comparative reading.
With lots of practice in this area, you will eventually reach a point where your metal detector as an extension of your hands as continuation of your perception and omniscience. You will be able to look down on the ground and have a pretty good idea of what that is.
Large nuggets, usually not too difficult to find. In most areas, however, there are hoards of smaller objects on gold ratio to each major nugget found. Small pieces of gold is your bread and butter! Most gold little gold, but it must be large enough to be worth your time.
Some of the contemporary gold detectors will pick up gold is so tiny that you could find them throughout the day; and in the end, not accumulated a lot of gold by weight. In this case, you can move to another area.