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Thread: Large river rocks in California gravel bar triggering signal, what are these?

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  1. #1
    us
    Oct 2018
    Central Valley California
    36
    63 times
    All Types Of Treasure Hunting

    Large river rocks in California gravel bar triggering signal, what are these?

    I went metal detecting for the first time today with a cheap metal detector in Briceburg near Yosemite, along the Merced river. Didn't find anything interesting aside from trash but it does work. One odd thing I noticed though is that some large rocks are also producing a signal, like that biggest rock here at the bottom of the picture. Wasn't able to get a closer picture, but it's just a large, dark colored rock that didn't look particularly special but was really heavy and large, only a sledgehammer would be able to break it open.

    Click image for larger version. 

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    Why would it be producing a signal, are these rocks full of iron concentrations large enough to set off the metal detector? I spend my time here just panning for gold instead since there are small flakes here and there but there's also a huge amount of black iron sand.
    A2coins likes this.

  2. #2
    us
    Apr 2009
    Indiana
    Fisher F70
    422
    809 times
    Dont know about the rock.

    That is a beautify location.

    Did you find any gold?
    A2coins likes this.

  3. #3

    Feb 2006
    1,025
    821 times
    Many rocks contain detectable metal ores. One of the most common is iron. These are commonly referred to by detectorists as “hot rocks”.

    Time for more coffee.

  4. #4
    Charter Member
    us
    Cat teaches man, not everything here serves him.

    Feb 2011
    S. Fl.
    Minelab Excal II, Garrett, Tesoro
    5,461
    6535 times
    All Types Of Treasure Hunting
    Honorable Mentions (1)
    Was just going to say, "hot rocks".

    They were all over Bondi Bch, Au, too,
    very frustrating little boogers...

    I'd double check it with the sledgehammer, though,
    just to be sure....

    GL & HH.... (yes, a beautiful looking location)...
    A2coins likes this.
    Yesterday is history, tomorow a mystery. All we have is the here and now, it's a special gift. That's why we call it "The Present"

    Pity the poor agnostic dyslexic insomniac who lies awake at night wondering if there really is a Dog.

    https://www.etsy.com/shop/patharp?ref=si_shop

  5. #5
    us
    Oct 2018
    Central Valley California
    36
    63 times
    All Types Of Treasure Hunting
    Thanks for the info, I have much to learn from metal detecting still, just got it this Christmas as a present. There is gold here but only really tiny flakes in the gravel, it just seems to be a waste of time metal detecting since the gold seems to come from all the way in Yosemite and just grinds down to tiny pieces that a metal detector can't find. Here's a nice overhead view of the area here.

    A2coins likes this.

  6. #6
    Charter Member
    us
    Tommy

    Dec 2015
    Ann Arbor
    AT MAX
    14,940
    16705 times
    All Types Of Treasure Hunting
    Honorable Mentions (2)
    What reading did your detecor give
    Approved TreasureNet Stickers
    .:: $4.00 for 11" X 3" Bumper Sticker ::.
    .:: $2.50 for 1" x 4" Detector Sticker ::.
    (Free Shipping)


    SEE: TreasureNet Bumper Stickers

  7. #7
    Charter Member
    us
    Tommy

    Dec 2015
    Ann Arbor
    AT MAX
    14,940
    16705 times
    All Types Of Treasure Hunting
    Honorable Mentions (2)
    Welcome from Mi. Tommy
    Approved TreasureNet Stickers
    .:: $4.00 for 11" X 3" Bumper Sticker ::.
    .:: $2.50 for 1" x 4" Detector Sticker ::.
    (Free Shipping)


    SEE: TreasureNet Bumper Stickers

  8. #8
    Charter Member
    us
    Cat teaches man, not everything here serves him.

    Feb 2011
    S. Fl.
    Minelab Excal II, Garrett, Tesoro
    5,461
    6535 times
    All Types Of Treasure Hunting
    Honorable Mentions (1)
    You may get more info out of the prospectors section/sub-thread.
    I mine gold, too, just in a different manner, opposite coast...
    I'm usually scratching around in a litter box.

    Them hard core prospectors would prolly laugh
    at anything us beach fellas tell ya.

    I did run across this today (on fb).
    That's about my level of panning/sluicing/etc...
    Even though I don't speak the language,
    I can see what they're saying....

    It is for learning sake, (somewhat)informative, none the less.
    And cute...

    https://www.facebook.com/goldlineorp...LS02pYDAYwESWy
    Yesterday is history, tomorow a mystery. All we have is the here and now, it's a special gift. That's why we call it "The Present"

    Pity the poor agnostic dyslexic insomniac who lies awake at night wondering if there really is a Dog.

    https://www.etsy.com/shop/patharp?ref=si_shop

 

 

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