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Grand Daddy Hot Rock

Hi Buzz,
I'd be interested in hearing a bit more about it. Is it one of a kind, or are there more in the area? What is its geological origin? Does it contain metallic iron, or just a high concentration of iron minerals?
Eric.
 
Hi Eric
I am not sure about total composition of the rock but it look like I am in and area in north Idaho that has a lot of these types of iron rocks.There probably made out of the same material that I sent Reg or close to it.It looks I need your DD setup when you get it perfected so I will be able to hunt in these hot rock areas here. I use the GQ on the beaches here and the machine performs outstandingly.
It sure likes shot gun shells as I found some early 1900 shell casings ends on the beach very deep.
 
Hi Eric,
Buzz sent me three rocks at my request so I could experiment with them to see if a DD coil would help his problem.
With a mono coil, the rocks produce a signal that is very loud and sharp, much like an iron object, when the PI is set with a short delay. If the delay is extended out quite a ways, maybe 40 usec to 50 usec, the signal almost disappears.
With a DD coil, the rocks display somewhat similar iron characteristics also. If the coil is close to the rocks, the rock will give a negative response when passed across the overlap zone, much like iron does when the delay is short. However, raising the DD coil a little to a distance of maybe 3", causes the signal from the rock to almost disappear.
The rocks are not overly heavy and are just slightly magnetic. When looking at the three I have, two almost appear to have a reddish or almost rust colored coating, similar to oxidized iron. One of these rocks has a fresh break. The interior of that rock is more of a dark grayish interior.
The third rock is a little larger and a little thicker. It also has reddish or rust colored blotches on it.
In summary, they do react differently than any other rock I have encountered before.
Reg
 
Did you ever scan these rocks with a VLF detector in the allmetal mode. I would be interested in seeing how they responded if you ground balanced the machine just a bit on the negative side for the GB to the local soil...then scanned the rock. If your GB is set just a touch negative and you scan in all metal the threshold will do one of two things....either it will react just like a target and givea good signal or it will null sharply over it then give a sharp whap as you come off.
Now it will only react like that if the GB is just a tad negative....if it is positive it will just respond to all rocks like a target. Just curious.
Scott
 
Hi Scott
Yes I did and I can tune out these particular hot rocks with the 10 turn adjument knobs and still picked up the gold with no problem.The machine balanced out just fine. As you know the GB1 doesn't have a all metal mode to speek of, as its set to the max with just the 10 turn adjustment knobs not like the GB2 with the iron reject switch. Like Reg said these are strange hot rocks.Looking foward to the DD setup mods for the GQ
 
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