I think youve run your battery down to zero by pinpointing to no end , pin piont once thrn dig the darn target. Also you should always run your detector over your screen , you might save hrs of useless digging ,cause sometimes there are more than one target. Cheers.
You need a plastic sieve then you can run the detector over it! BTW, what setting are you using on the Nox? I use the Nox myself, but never like this...
Each time you dig up dirt, you should be testing with the detector, or wand if the targets been hit or not. You appear to be doing it the opposite way🤷🏽♀️🤣🇬🇧
You would first have to repeatedly NOT find gold in areas devoid of heavies, in order to validate your hypothesis of there being gold where there are heavies; otherwise, finding gold where you did was pot luck and fed into confirmation bias.
Can't knock your base logic though, since there's a good liklihood of heavy objects dropping and settling close to one another in a fast flowing body of water.