A few posts recently on the dreaded hot rock issue have popped up. This is advice from minelab, and the settings and coil preferences relate to Minelab gear. For non-Minelab users, perhaps your manufacturer has similar advice. There is a good bit of advice - hot rocks are a good indicator of mineralised ground -which is what we are after.
Follow the links - two parts:
http://www.minelab.com/aus/treasure-talk/hot-rocks-part-1
http://www.minelab.com/aus/treasure-talk/hot-rocks-part-2
Follow the links - two parts:
http://www.minelab.com/aus/treasure-talk/hot-rocks-part-1
http://www.minelab.com/aus/treasure-talk/hot-rocks-part-2