Hard rock mining. Crushing gold bearing rocks to 50 mesh.
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Thread: Hard rock mining. Crushing gold bearing rocks to 50 mesh.

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  1. #1
    us
    Sep 2020
    Las vegas
    Mine lab 800
    6
    3 times
    Metal Detecting

    Hard rock mining. Crushing gold bearing rocks to 50 mesh.

    I have been prospecting in several locations around one mountain. Have pulled about 200 lbs of gold bearing rocks out. I have crushed up 25% to 50 mesh and have run it through a blue bowl. But I see there is still gold going through. I have capured about 2 grams I believe so far.
    I can not afford a shaker table at this time which would probably be better at catching all the gold.
    I have found one nice small rock with. Signs of gold on both sides. I will post a picture here. The nice thing is there is no claims what so ever in the area that I am prospecting.
    Anybody have any suggestions of being able to recover fine gold. I am not good at panning. I have about a 1/8 of a 5 gallon bucket of concentrates and probable another full 5 gallon bucket to break down to 50 mesh.
    The blue bowl does not seem to catch a lot of the finer gold that I have.

    Click image for larger version. 

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    Reed Lukens likes this.

  2. #2
    us
    retired bumb and part time Hobo

    May 2005
    St. Louis, missouri
    6,140
    4923 times
    Practice ,.practice ,practice your panning . That's the final process for getting fine gold . AND the cheapest.

  3. #3
    us
    Silver Fiend

    Oct 2009
    9,560
    9217 times
    All Types Of Treasure Hunting
    If you cant pan, you need practice. If your blue bowl isnt catching gold then either there is no gold or youre not using it properly. Not everything that sparkles in a rock is gold.
    You can follow me in other places.
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  4. #4
    us
    retired bumb and part time Hobo

    May 2005
    St. Louis, missouri
    6,140
    4923 times
    Quote Originally Posted by Jason in Enid View Post
    If you cant pan, you need practice. If your blue bowl isnt catching gold then either there is no gold or youre not using it properly. Not everything that sparkles in a rock is gold.
    NOT SO !!! when I see gold in my pan my smile sparkles like the morning sunrise !

  5. #5
    Dry washing / metal detecting

    Sep 2013
    Las Vegas
    Whites and cheep bounty hunter
    376
    244 times
    Prospecting
    Gold cube
    russau likes this.

  6. #6
    zw
    Jan 2015
    158
    184 times
    All Types Of Treasure Hunting
    Mercury if it is legal where you are
    Clay Diggins likes this.

  7. #7
    us
    Period Six Mining and Exploration, LLC

    Aug 2010
    Southeast Arizona
    3,129
    4642 times
    Prospecting
    Quote Originally Posted by pczim View Post
    Mercury if it is legal where you are
    I'll be the one to speak out against using mercury, especially for a beginner. While it is very effective as recovering fine gold, it can also be a pain to deal with when it comes time to retort it. One good whiff of volatile mercury and it may be game over.

    With the blue bowl set up to recirculate the water, i would try some Jet Dry and adjust the water flow. Your crushed ore will need to be screened by mesh size as much as possible. Start from the largest size and work towards the smallest while reducing water flow for the smaller sizes.

    Dream Mat now makes a vortex mat for the blue bowl. I have not used it, but those that have say it works great.
    Mining is how I make my living. I turn mountains into dust on a daily basis.

  8. #8
    Charter Member
    us
    I can dig it! "WP"

    Mar 2007
    Arizona
    Whites TM 808, Whites GMT, Tesoro Lobo Super Traq, Suction Dredges, Trommels, Gold Vacs, High Bankers, Fluid bed Gold Traps, Rock Crushers, Sluices, Dry Washers, Miller Tables, Rp4 Shaker table, etc.
    6,091
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    Quote Originally Posted by Mad Machinist View Post
    With the blue bowl set up to recirculate the water, i would try some Jet Dry and adjust the water flow. Your crushed ore will need to be screened by mesh size as much as possible. Start from the largest size and work towards the smallest while reducing water flow for the smaller sizes.
    ^ X2 ^ Best safest way to recover the -50 and finer, even down to -200 and smaller
    Jet -dry is the key just dont use too much, a little goes a long way. If you see bubbles you used too much. Start with a few drops and only add a drop at a time from there if needed. There is no substitute for micro classifying, especially when running powdered rock.

    The human eye can only see a single particle down to 50-60 microns (230 mesh) however when smaller particles -300 -400 mesh accumulate in the bowl they are readily seen.

    Go for the Gold
    GG~
    Last edited by Goodyguy; Sep 28, 2020 at 09:24 PM.

  9. #9
    us
    Period Six Mining and Exploration, LLC

    Aug 2010
    Southeast Arizona
    3,129
    4642 times
    Prospecting
    Quote Originally Posted by Goodyguy View Post
    ^ X2 ^ Best safest way to recover the -50 and finer, even down to -200 and smaller
    Jet -dry is the key just dont use too much, a little goes a long way. If you see bubbles you used too much. Start with a few drops and only add a drop at a time from there if needed. There is no substitute for micro classifying, especially when running powdered rock.

    The human eye can only see a single particle down to 50-60 microns (230 mesh) however when smaller particles -300 -400 mesh accumulate in the bowl they are readily seen.

    Go for the Gold
    GG~
    Wish I could see down to 230 mesh again. Damn eyesight is going. Getting old.sucks rocks. Gonna need bifocals soon. Lol!!!!
    russau, Reed Lukens and Goodyguy like this.
    Mining is how I make my living. I turn mountains into dust on a daily basis.

  10. #10

    Nov 2020
    8
    4 times
    All Types Of Treasure Hunting
    Make a shaker table, and you’ll be able to get micron gold well, 85% or so of 50micron. A human hair is 90 micron, so you do that math.

  11. #11
    us
    Nov 2010
    High Rockies
    GB2
    137
    188 times
    All Types Of Treasure Hunting
    Blue bowl with straight crushed rock would be a nightmare. You have to feed so slow that it is not practical in my opinion. Also, freshly liberated gold from rock is typically really angular, flat, scaly, thin etc. and small which makes it very difficult to pan and process via high flow gravity techniques.

    A better bet would be to crush your rock, wet it, jet dry and then feed through a cube and or fine gold recovery sluice. Run it twice. Pan those cons or try them in the blue bowl.

    I imagine this would be much much faster and give you higher recovery rates.

 

 

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