Ever see mineralization like this while hunting gold? New to me.
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Thread: Ever see mineralization like this while hunting gold? New to me.

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  1. #1
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting

    Ever see mineralization like this while hunting gold? New to me.

    Apologies in advance for the “what is this” question. I’ve gotten pretty good at identifying rocks and minerals in my area, but I’ve not seen this before. Any thought on what the dark mineralized areas are. My best guess was a telluride. I believe that the host rocks are feldspar.

    I’ve started to find mineralization like this in an area where I’ve found a pretty good amount of silver (in the form of silver chloride) and am starting to find some really fine gold (only a very small amount so far). Gold is getting better as I dig down. These rocks came from a layer of very densely packed gravel and rock a few feet below stream bed (not hard pack). I originally believed that these rocks simply had been covered with manganese dioxide. However, breaking some of them revealed that the mineralization is inside as well, quite a lot of it.

    Click image for larger version. 

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    Last edited by Boarteats; Nov 26, 2019 at 11:19 PM.
    TheDirtKing likes this.

  2. #2
    Bill Jarrell

    Sep 2012
    AK,S.OR,N.Cal
    MD-20,GMT,Gold Bug pro, Sluice, Dredge, Eyes, ATX, pro pointer
    102
    53 times
    Prospecting
    Are they magnetic?

  3. #3
    Charter Member
    us
    Nov 2012
    Maryland
    XP Deus, Tesoro Cibola, Full sized shovel and a backhoe
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    Looks like iron residue, the stuff black sands is made from. It's always good to find the black sands.
    Boarteats likes this.

  4. #4
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting
    Quote Originally Posted by hunterbill View Post
    Are they magnetic?
    Not attracted to magnet at all. I tested with a really strong neodymium magnet. Also, propane torch doesn’t affect it. Neither does HCL.

  5. #5
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting
    Quote Originally Posted by smokeythecat View Post
    Looks like iron residue, the stuff black sands is made from. It's always good to find the black sands.
    Lots of iron oxides in this stream. I've collected a small bucket of magnetite along with other dark heavies left over after panning. The reddish brown portion could have an iron oxide component ..if not entirely iron oxide. However, the dark grey material doesn't look like iron oxides to me. Admittedly, prospecting is a hobby, so my experiences are minimal.

  6. #6
    us
    Brian

    Mar 2014
    Central Oregon Coast
    Whites GMT Garret fully underwater
    988
    2391 times
    Prospecting
    Not enough mineralization to give a thought to. Near as I can tell the samples are stained.

    Bejay
    Boarteats and Clay Diggins like this.

  7. #7

    Dec 2015
    175
    288 times
    All Types Of Treasure Hunting
    Boarteats likes this.

  8. #8
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
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    looks like common staining from exposure.

    The mineralization of loose rock and cobble will tell you very little.

    You need to find mineralization in the country rock. Concentrations of it. You have to consider the whole of the earths crust is mineralized..Your looking for the sweet spots.
    Boarteats likes this.

  9. #9
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
    5,606
    12177 times
    All Types Of Treasure Hunting
    Banner Finds (1)
    Quote Originally Posted by Gambrinus View Post
    I don't see enough of the rocks grain to make that ID .
    Boarteats likes this.

  10. #10
    us
    TerrysKnifeStore.com

    May 2010
    White Plains, New York
    Minelab GPZ 7000; Equinox 600 -- Teknetics EuroTek PRO -- Grave Digger Tools Nemesis shovel, Sidekick hand digger -- Bunk's Hermit Pick
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    Metal Detecting
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    Here is some gold ore:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  11. #11
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting
    Quote Originally Posted by Terry Soloman View Post
    Here is some gold ore:
    What is your host rock, feldspar, quartz, calcite? Most of the rocks that I’m finding look very similar. Should be easy enough to crush my rocks and pan, I suppose. I additionally have silica rocks (maybe quartzite) that have a crazy amount of iron staining. Also, has various sulfides, purple/blackish. These, are too hard for me to crush. However, great for polishing with an angle grinder

  12. #12
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting
    Quote Originally Posted by Gambrinus View Post

    Interesting comment. The Baltimore Gabbro Complexe is a large itrusive igneous rock formation that underlies the area where my streams are located. However, the rocks don't look porphyritic in person.

  13. #13
    us
    Mar 2018
    Near Baltimore
    82
    84 times
    Prospecting
    Quote Originally Posted by Goldwasher View Post
    looks like common staining from exposure.

    The mineralization of loose rock and cobble will tell you very little.

    You need to find mineralization in the country rock. Concentrations of it. You have to consider the whole of the earths crust is mineralized..Your looking for the sweet spots.

    This info helps a lot! Sounds like all one can do with alluvial deposits is look for concentrations of heavy minerals such as iron, since that will be where gold will tend to settle. Specific rock composition isn't terribly informative since alluvial deposits are a hodgepodge of rocks that came from somewhere else.

    I know someone nearby who has what appears to be an extremely weathered outcrop of dark rock on their property. Also, has white quartz in ground but I don't know if I am seeing large chunks of quartz that came from elsewhere or if the quartz is part of a larger body of buried rock. Might be time to make a new friend.
    Last edited by Boarteats; Nov 28, 2019 at 02:54 PM.
    arizau and et1955 like this.

 

 

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