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Thread: black sand clean up

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  1. #31
    us
    Apr 2005
    North Carolina
    White's Prizm IV
    3,230
    370 times
    All Types Of Treasure Hunting

    Re: black sand clean up

    Quote Originally Posted by Astrobouncer
    This is an interesting thread, but this quote here:

    Quote Originally Posted by Wallace J
    Out of a ten pound jar [of black sand] we got three pounds of gold.
    I have a little trouble believing that. But still good info in here nonetheless.

    I can believe it Astro. In some areas of Cali I here that on average 4 out of every 10 grains of black sand is encrusted gold. One reason I NEVER throw anything away.
    Heavy pans,
    enamel7
    2014 COIN ROLL HUNTING TOTALS!

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  2. #32
    us
    Jun 2009
    Blue Ridge, South Carolina
    818
    292 times

    Re: black sand clean up

    That's pretty amazing. I always keep my cons too, for when I get a ball mill or something to grind them down with.
    Sample till you find the hot spot, then mine it till its gone! Then start over...

  3. #33

    Nov 2007
    ,M.X.T.& Tesoro Tejon
    9,707
    2645 times
    All Types Of Treasure Hunting
    Banner Finds (1)

    Re: black sand clean up

    I have 10 five gallon buckets of Black sand if anybody would like to buy some,$1.00 a pound plus shipping.All dredge cons panned and spiral wheeled once
    M.X.T , Tesoro Tejon



    "A pen in the hand of this president is far more dangerous than a gun in the hands of 200 million law-abiding citizens."

  4. #34
    ca
    Sep 2010
    26
    1 times

    Re: black sand clean up

    wpareig
    Interesting method you have evolved for separating gold from black sand via an ultrasonic jewellery cleaner.
    I had an idea similar to this that was inspired by a conversation I had with an oldtimer here.
    I live on the north coast of British Columbia, Canada. On a very remote section of storm washed beach here, there are deposits of black sand twenty feet wide, 12" thick and miles long. Assays have shown this placer to be very rich in gold but the gold is microscopic and of a flaky nature and seems to defy most gravity separation methods.
    I was told that, in the Depression years, many small miners would pack this pure black sand out on packhorses and attempt recovery of gold back at their homesteads. Considering the high density of black sand, the assays on the placer, and the price of gold in the 1930's, this did not seem credible. On the other hand, my grandfather shovelled coal for ten cents a ton in the Depression. Hmmmm....must have been tough sob's in those days.
    According to the oldtimer I spoke to (who was a boy during the Depression), a simple method was devised to concentrate the placer on site to much more manageable volumes.
    It consisted, believe it or not, of simply putting black sand and an equal volume of water in a bucket and slamming the bottom of the bucket down on a plank, log or flat rock. Following this, 90% of the top of the black sand in the bucket was removed and more added. Many buckets of black sand could be reduced this way to possibly a couple of quarts of rich concentrate.
    I thought of expanding on this idea by using a small concrete compactor; the sort used to compact concrete in building foundation forms. It would be somewhat rougher than your idea but would be capable of higher throughput volumes.
    A couple of questions:
    1. Does the frequency of vibration seem to make any difference? I can visualize the wrong frequency floating gold to the surface instead of sending it to the bottom LOL.
    2. What exactly is Degassing anyways? You mentioned you were impressed with the Degassing Peoperties of the ultrasonic jewellery cleaners you had purchased. I've heard the term before but have no clue as to its meaning.
    3. Have you ever considered using citric acid or a salt roast over a hot fire to break down the oxides and allow access to micron gold beneath it?
    As I stated, the placer I am looking at is very rich and in a very remote location. It may not be economical to attempt anything but separation of free gold from the black sand. However, I think it would be worth testing, using your methods, to see if there are hidden values in the black sand that might be processed on site.
    Regards
    Bob
    Give a man a fish and you will feed him for a day; teach him to use the Internet and he won't bother you for weeks.

  5. #35
    us
    metal detector

    Sep 2010
    Denver,CO
    xterra 705 by minelab
    92
    2 times
    All Types Of Treasure Hunting

    Re: black sand clean up

    This is amazing 3 pounds wow! Every prospector should know about this, I wonder how many people are unaware they are throwing tons of gold back into the sources they got it from.

  6. #36
    jm
    Sep 2008
    19

    Re: black sand clean up

    I am seeing wpareig method as something I would like to try.If it works as well as wpareig suggests,then I may be better off buying an ultrasonic cleaner than the wave tables by action mining for small scale work.The idea of different frequencies,particle size seem worth exploring.I looked at the machines at the company's website and they have quite a variety.Small to large volume versions.Wpareig, you are unto something here.But I just need to explore the possibilities.Based on the website, frequency MATTERS.So the more recent versions offer multifrequency options as well as heat.Seem kinda analogous to metal detecting were your 14kHz MXT versus the Gbugs 71 kHz and sensitivity to smaller gold.Interesting potential here.If anyone else have explored this practise,please let us know.

  7. #37
    us
    May 2008
    deming n.m.
    Any thing Available within 50ft
    521
    8 times

    Re: black sand clean up

    You Need one of these!

    You Fill it, Run it, Fill it Run it, Dump top half, Fill it Run it. Repeat a bunch of times and then Pan the bottom 1/8th.



    Run it strait up!

  8. #38
    ca
    Sep 2010
    26
    1 times

    Re: black sand clean up

    gedfire

    There is a new product on the market called the Quicksand Concentrator. Check out their website at www.gotnuggets.com.

    I phoned their shop in California this afternoon and had a long chat with the inventor of this unit. It sells for $60, requires no power, is not much bigger than a loaf of bread and requires only water pressure from a pump. They sell a 500 GPH 12 volt pump to supply water to it for another $30.

    According to its inventor, this unit works on the fluidized bed principle. Ore or placer material, be it bank run, crushed ore or black sand, need only be screened to 8 mesh (1/8") and can be fed into this unit at a virtually unlimited rate. Water is fed by hose into the bottom of the unit, fluidizing the bed, and the process separates denser material via liquefaction. He feels this unit could make sluicing, panning, etc. obselete.

    I suggested a vibrator might make this work better but he claimed the water alone worked just fine.

    He also said he had a customer who grinds his black sand to -200 mesh and successfully uses this unit to recover PM's from the -200 mesh material. That alone is a rather remarkable feat, I daresay.


    I plan to purchase one of these.

    Regards

    Bob
    Give a man a fish and you will feed him for a day; teach him to use the Internet and he won't bother you for weeks.

  9. #39
    jm
    Sep 2008
    19

    Re: black sand clean up

    Homefires and Bob,

    Thanks homefire and Bob, great suggestions.Incidentally,the day I made this post I looked for different types of electric cement mixers.Homefires, throwing a few river stones or steel balls in the should help eh? I am elated that technology has come so far as to allow for efficient recovery at lower cost to the small scale miner.

    Bob loved the description of the device.Seem to be a mini elutriation tower.I like the fine gold recovery potential.Hope I can get some testimonials from users of the device.

    regards,
    Ged

  10. #40
    ca
    Sep 2010
    26
    1 times

    Re: black sand clean up

    Ged
    No, this is most definitely not an elutriation tower. The inventor was quite emphatic about that point. This unit works on the principle of liquefaction; ie. liquefying a mass of media and letting its fluidized bed separate by density.
    E-towers are rather finicky devices and can only be fed at a very restricted rate. He claims the feed rate on this unit is virtually unlimited.
    He also said he is currently developing a unit based on a container in the five gallon bucket range and hopes to be marketing it soon.
    Regards
    Bob
    Give a man a fish and you will feed him for a day; teach him to use the Internet and he won't bother you for weeks.

  11. #41
    us
    Sep 2010
    5

    Re: black sand clean up

    I've got some questions about this as well.....isn't cracking the black sand via salt and heat as good as going to the trouble of grinding it up? I thought about cracking my sand and then putting in an old ice cream maker along with citric acid, some ball bearings and letting it tumble for 24 hours. Would this achieve approximately the same results as crushing do you think? Going to a claim in a week or two that has a LOT of fines and flour gold in the topsoil and I don't want to let one speck get away through my black sand or anywhere else!

  12. #42
    ca
    Sep 2010
    26
    1 times

    Re: black sand clean up

    digger

    From what I understand, salt roasting, cracking and acid soak achieve the same results as grinding. Most authorities agree that roasting will burn off pyrites bound to particles of gold (watch out for arsenic fumes from arsenopyrites) and acid will consume any iron particles binding gold particles.

    The ball bearings rolling around in your ice cream maker are basically a re-invention of the ball mill. If left long enough, you will likely get the same reduction in particle size as his roller mill does and free up just as much fine gold.

    What I don't understand is the concentration of citric acid to use. It can be bought in the powder form at a reasonable price. Can one make as strong a solution of acid from the powder as needed?

    Regards

    Bob
    Give a man a fish and you will feed him for a day; teach him to use the Internet and he won't bother you for weeks.

  13. #43
    ca
    Jun 2011
    2

    Re: black sand clean up

    Hi guys & gals; I'm a placer miner in the cariboo reg in B.C. Canada, I get a lot of very fine gold and have come to the conclusion the only realist way to handle my cons is to reconcentrate and then pour a dore bar. My question is, I run about 2/3 iron sulfides and 1/3 black sands,,, does anybody know what I should use for the best flux? thank you....tlt

  14. #44

    Jul 2012
    3
    All Types Of Treasure Hunting

    Black sand smelting

    Have you manage to smelt the black sand and get your gold out of them

  15. #45
    us
    May 2009
    111
    2 times
    To smelt black sand directly it needs to have a HIGH amount of visible gold in it. If not then you wont have much luck at all smelting it , just wind up with a chunk of nastly looking slag. Not all black sand will have coated gold hiding as black sand. You also have to take into consideration that you need cone molds to pour the melt into so your gold will go to and be concentrated at the bottom. You really shouldnt try to smelt any more at a time than will fit in your mold , and unless you have a lot of them , that limits your melt to just a small amount , since you need room for the melted flux too. The best thing to do is run all your concentrates over a miller table , sucking up all the visible gold you see into a snuffer bottle. When you get enough in the bottle you can smelt that , since it will be mostly visible gold with probably just a small amount of sand mixed in it. If you are careful , you will have only gold in the bottle and you can get away with just "melting" it in a melting dish with a torch. Blindly smelting black sand because you assume there is gold in it though will generally not help you any. A miller table is your best friend when it comes to getting fine gold out of your concentrates and even though you can buy them they are easy and way cheap to make.

 

 
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