Grubstake,
I've hunted that red clay stuff in Arizona, and it's bad. So in the DD configuration it runs quite quiet--well, I know a place that's red hot, but it's horrid black bedrock, smooth, and the nuggets get down deep in the cracks.
Interesting that the hotrocks still sound off--only stuff I've found like that is almost pure native iron inside--jumps to the supermagnet like it's heading home for Christmas. Did find some red bedrock once that was similar--all kinds of natural iron in it--chunks jumped to the magnet in a hurry.
Some of those glacial deposits are extremely interesting, especially when you're trying to figure out where they spread the gold next, and you've given me an idea--I've driven by an area for a couple of years now, right on exposed bedrock, with about three feet of overburden, but the clay carries sharp rocks--no rounded stones, but that won't stop me now--thanks for the info. I guess I should always check things out.
The worst ground I hunt is hotter than you know what graphite schist--worst stuff I've ever swung a coil over--will transmit electrical current, but the gold doesn't care--it loves to hide in it anyway.
Nice that the boys in the 30's threw out all the big stuff for you--most thoughtful of them--putting aside a stake like that for a future generation
Thanks again, nice to get the goods from someone out in the field instead of some report written by a desk jockey sitting by the pool.
Sounds like an awful good coil Grubstake.
Lanny