Most interesting! I have used mine to confirm if there was anything in the 5 gallon bucket worth processing any further, if no zip zip then I filled another bucket and repeated the test with the GMT. I had a spot on the gravel bar that had no signal in it, I would dump my 5 Gallon bucket sample on the no signal spot and then test it with the detector. I did sample the no signal piles and indeed found zero gold in them. The positive zip zip piles all had gold in them.
Yup! My bet is it's all green muck! I'd forgotten about that part of slow water. If one wants drinking water from the river then filtering it is the safest way to go.
One relatively simple green year, I set myself up on the downriver side of a fairly small boulder that was out in what would have been fast water under early summer conditions but was now dry though not far down there was water.
I dug and immediately classified to 1/16" into a 5 gallon bucket, dumped the completely washed larger rocks onto the dry riverbed and panned the cons. I got some gold out of the cons, looked at the pile and admitted to myself that if there was any larger gold it would be in that pile. If I'd had a GMT then it would have sounded off nicely as I did find a small nugget it the pile via Quick panning..........63bkpkr
Enjoy!..............63bkpkr