We've used the XP classifier on desert benches in Arizona where the gold is flour-fine and the host material is heavily oxidized

9-segment visual target ID paired with 4-tone audio so a target gets identified twice

such as slicing

and mineralized mud

our guide to metal detector technologies explains how VLF frequency selection affects target response in mineralized soil

Fisher F11 Metal Detector with 11" Waterproof DD Coil underwater We've used the XP classifierThe Fisher F11 is an ultra lightweight VLF metal detector built for coin shooting, jewelry hunting, and relic recovery in parks, fields, and dry sand beaches. Running at 7. 69 kHz with three turn on and go modes (Jewelry, Coin, Artifact), a visual target ID, and 4 tone audio, it gives beginners and casual hunters a simple, reliable machine that works right out of the box. This version comes with the larger 11 inch waterproof DD coil for more ground