I have several vlf metal detectors over 30khz. GMT, 24K, Nokta AU, and was thinking about adding the gb2. Sure these detectors found gold worth keeping, but can you say a lower freq machine would not have also found those, (and maybe go deeper to find more)?
Here is what I now ponder. The high freq VLF can sniff out gold so small that it is worth pennies. If it takes me 15 minutes to recover the target, and I find another target in a half hour, I am working for pennies an hour. I am thinking about going back to my <20 khz VLF's, Lobo, F75, Tejon, F19, DFX, CZ20, and hope for a bit more depth.
If you get a weak signal with a >30 machine, you don't know if it is a small target or a larger deep one. If you get a faint signal with a <30 machine, You can bet it is not a flake not worth digging.
Time spent digging up a penny target is time not spent finding something larger. Why have a detector that will have you digging up a piece of dust? Any thoughts about my logic?