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Hot rocks

N

NH Bob

New member
The High pitched tone we call hot rocks. 00-31.in my area.
Found this today. What do hot rocks read in your area??

QUOTE
Hot Rocks
How To Eliminate Hot Rock's Response
Hot Rocks are pebbles or rocks that contain more nonconductive mineralization than the surrounding ground to which the metal detector is balanced. When hot rocks are in the detector's electromagnetic field, they disturb the ground balance of metal detector so intensively that the machine reads them as metal targets, i.e. the hot rocks produce a positive or false metallic responses which slightly vary in pitch tone from one area to another. Hot rocks can contain either a mineral density (pebbles) or mineral quantity (large rocks), or both.

The Full Band Spectrum (FBS) system found on the Explorer series automaticly adjusts the ground balance every time it gets affected by a more concentrated change, caused by the hot rocks or black sand deposits, in nonconductive mineral intensity. But in case of a high SENSITIVITY setting in MANUAL mode and SOUNDS set on FERROUS (pitch tone is based on the targets inductance), the hot rocks can drive you crazy.

They would give you a distinctive "screaming" signal with a solid "silver-like" high pitch tone but without any sound imperfections. One way of determining whether the signal is produced by a hot rock or a good target is to dig a few hot rocks in the area and train your ear to their response. Another way is easier: when a hot rock is pinpointed, it always gives a pulsating signal as if it's a deep target.

To get rid of unwanted responses from hot rocks, you can do one of the following changes of settings:

1) Slightly reduce the level of SENSITIVITY setting and switch it from MANUAL to the SEMI-AUTOMATIC mode.

2) Reduce the level of SENSITIVITY and switch SOUNDS from FERROUS to COND (pitch of tone is based on the target's conductivity).

3) If you don't want to reduce the reasonably high level of SENSITIVITY (your metal detector is stable) and change SOUNDS from FERROUS to COND, you can simply discriminate hot rocks, but only if they don't register in the "silver" area on the SmartFind display. For example, once I extended the black (rejected) crowncaps column up just one square--that was where all hot rocks at one particular metal detecting location registered.
 
n/t
 
Personally I just ignore them. I'm still trying to figure out the difference between Hot rocks and Cold rocks. I read somewhere that one comes in high like silver and the other comes in low like the low drone of iron.
 
I am not for sure either..We get these things around the Lake, and, they light up your detector like a pinball machine..Nothing I have tried gets rid of them..maybe your suggestion will help..I think these are Low iron filled rocks.Or maybe mostly iron ore'd rocks.
 
Oh, I tested the ones I was hitting the other night just now and they're reading about 00-28 (might flicker down to 00-27 or up to 00-29 but mostly stable).
 
Looks like my earlier post didn't go through (might have just hit preview and then closed the window).

After your earlier post, I did some searching and found this earlier post from cody (is he (she?) still around)

http://www.findmall.com/read.php?19,67307

that seems to cover some of the things we're talking about, even if it's mostly about something else.
 
That's the thing I'm confused about. Hot rocks V Cold rocks. One comes in high and the other comes in low.
I think it's the heavy black magnetic rock that comes in high and that is a cold rock the way I read it.
The rusty red rock is the one that comes in low. :shrug:
 
On what kind of rock does what or something else?

Here's another more general post on the subject: http://www.treasurenet.com/forum/prospecting/archives/19990705/messages/1002374.shtml
 
And here's another one with more detal (from the persective of gold prospecting but still relevant and informative).

http://www.keeneeng.com/pdfFiles/ElectronicProsp.pdf

(Note that that one is a PDF.)
 
Cold rocks are low tone or come in more like iron infested soil.
Hot rocks come in high as silver and are harder to disc. out.
Hot rocks are the ones we as coin and relic hunters have to deal with as they are a higher conductivity.
Cold rocks are what Nugget hunters have to deal with as they are looking for that low conductive gold.
What I read a while back through me. Had me thinking it was just the opposite.
 
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