No replies so I’ll add some content…
I tried the AQ with my bucket of “black sand” from upper Newport. It detects my gold ring no problem, really strong with the Bigfoot coil and any run mode. The volcanic mode seems worse depth of all. Then I tried some gold nuggets I had found at a Havasu Goldseekers dig. It only sees them if they are on the surface. No superior mode here either - just doesn’t work. Here’s a photo of the gold and my bucket. All of this seems to contradict what Alexandre was suggesting in his comments here. I wonder if they just gave up on volcanic mode and focused on the others.