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Thread: What is a HOT ROCK?

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    Junior Member Lineman's Avatar
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    What is a HOT ROCK?

    Can anyone explain what a hot rock is? Just in case I might run across one.

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    Super Moderator deolslyfox's Avatar
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    A "hot rock" is a rock containing an amount of mineralization, normally iron, that is significantly ABOVE the ground balance point. Conversely, a rock containing an amount of mineralization that is significantly BELOW the ground balance point is a "cold rock".
    If there's anything I hate worse than diggin' pulltabs, its missin' a gold ring.

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    Come up and I'll take you to hot rock heaven ..... If you don't have a V3i or DFX, they will drive you bonkers with all the noise..
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    Guru jadesun's Avatar
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    I hate hot rocks! unlees thier in a suana!
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    Quote Originally Posted by Lineman View Post
    Can anyone explain what a hot rock is? Just in case I might run across one.
    A "hot rock" is simply a rock that makes the detector respond or sound off due to one of two basic factors:

    1: Their Ground Balance point is a higher number (more iron mineralization) than the adjacent ground where you GB'ed your detector. These are called 'negative hot rocks' or 'Cold Rocks' and produce a negative or nulling response and what we call a 'boing' sound and not a 'zip' sound.

    2: If the rock's Ground Balance point is a lower number (less iron mineralization) than the adjacent ground where you set the GB, then they are called 'positive hot rocks', or just 'Hot Rocks' as compared to 'Cold Rocks.' These will generally produce a 'zip' or regular 'beep' sound because the GB is set more positive for them while ignoring the surrounding ground.

    Depending upon where you are hunting you could run across both types. When hunting any location with Hot or Cold Rocks I like to make sure I am not using any AutoTrac™ function. I usually don't, anyway, because a detector can 'track' off of a normal setting when you sweep over these types of rocks, or over iron targets. It's especially noticeable with the fast-tracking circuitry.

    Monte
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    Exalted One Dave's Avatar
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    Quote Originally Posted by Nitro 54 View Post
    Come up and I'll take you to hot rock heaven ..... If you don't have a V3i or DFX, they will drive you bonkers with all the noise..
    LOL Glen ...I think it's called the western United States ...
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    Guru Napa Steve's Avatar
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    Platinum Member JTTGOLD's Avatar
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    if you ever go over one with your detector believe me you will know it,you will think your detector blew a gasket.

  9. #9
    Exalted One giant056's Avatar
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    I rarely dig them on land but I get a lot of them from the water with my BeachHunterI.D., they're unavoidable around this area, they are everywhere and once you learn what they are you'll think. . . . not a problem and won't even dig them unless you want to.

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    Guru salty dog's Avatar
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    I dug one yesterday,but mine looked more like a slag or cinder from a furnace,Versus a real hot rock...
    Life is Short,Make every day count, and Go for the Gold !!!!

  11. #11
    Platinum Member THE EXCAVATOR's Avatar
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    On an excavation under the foundationd of a medieval church I came across large patches of hot rock that turned out to be a much earlier wooden structure that had burned down, It drove me nuts!!!!

  12. #12
    Platinum Member THE EXCAVATOR's Avatar
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    Quote Originally Posted by Napa Steve View Post
    The Cars, the Eagles, Steve Miller,
    Subtle but sweet Steve!....I swing more towards AC/DC ( no pun intended )

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  14. #14
    Now if you ask Cliff that would be any rock that is not in the shade ! Its really really hot in Arizona but hey its a dry heat LOL
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  15. #15
    Bronze Member neil diggit's Avatar
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    My yard is full of them. You're welcome to dig there here all you'd like. I'll even help you haul them away.

  16. #16
    Bronze Member migz's Avatar
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    Fox and Monte pardon the new kid, but aren't you guys saying opposite things here? The "detectors/surrounding ground" GB is more positive (higher VDI) in relation to the rock with more mineralization/iron (lower VDI) GB, therefore it is a negative hot rock or cold rock or the other way around. Maybe neither? Takes me a few times to grasp the meaning sometimes. Sorry to slow the party...AC/DC!

  17. #17
    Super Moderator deolslyfox's Avatar
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    Here's what the V3i User Manual says - Pg 32.

    • What is +95? A +95 can represent a hot rock, (sometimes called a cold rock in prospecting slang).

    This rock/iron can be above the ground balance point, referred to as “Hot Rocks” or below the ground balance point often referred to as "Cold Rocks."

    I believe that Monte and I said the same thing .... Its the point of reference. The more iron mineralization, the more NEGATIVE the number, or the closer to -95. I described a hot rock in terms of "quantity" and Monte described it in terms of "effect". If you combine the two descriptions, you would arrive at something like ....

    "A hot rock contains an amount of iron mineralization that results in a ground balance point (VDI number) higher than the ground balance point (VDI number)." In other words, if the amount of iron in the rock is less than the amount of iron in the soil, it will be a higher VDI, or a "hot rock". If the rock has more iron than the amount of iron in the soil, it will be a lower (more negative) VDI, or a "cold rock".

    That help ??
    If there's anything I hate worse than diggin' pulltabs, its missin' a gold ring.

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    Excellent explanation!!

  19. #19
    Bronze Member migz's Avatar
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    Fox, thank you. I definately understand now and hope I didn't confuse anyone in the process. I am good to go and you guys are a big help.

  20. #20
    Super Moderator deolslyfox's Avatar
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    The whole idea and premise of the forum is to help people understand their White's instruments and the things that affect the performance of those units. When you get two answers that don't make sense to you, you should do exactly what you did .... Speak up!! You will find that most times, there is more then one way to explain something, and those two explainations may not always be "intuitively obvious to the casual observer". Also, I don't know anybody that's perfect, so I if misspeak about something - call me on it. If I'm wrong, I'll fess up and move on. Same / same, even if the answer provided by someone is correct, if you can't understand it, its not helpful, so keep at it until you get an answer you CAN understand !!
    If there's anything I hate worse than diggin' pulltabs, its missin' a gold ring.

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