I myself havent found nuggets yet.
But I take some fine gold that Ive panned , and I air test alot.
It will "detect" some very small stuff at about an inch. So that gives me hope.
But , I find that air testing helps me to figure out how to set my settings properly, and the different sounds I'll get.
I do it all , Gain maxed, SAT low, then slightly tweak the knobs in different directions till I find where I get the best response.
I'm still working at getting it all in my head.
But its the only type of hands on I can get, till the snow melts.
I do have "The MXT EDGE "book, and I think it is a must for me , to fully understand the potential of my MXT , and how to get that performance .
Good Luck to ya, and let us know how that goes.
Dusty