Crushing black sands- What Ive tried and a question.
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Thread: Crushing black sands- What Ive tried and a question.

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  1. #1
    us
    the fire

    Aug 2010
    320
    1 times

    Question Crushing black sands- What I've tried and a question.

    I've read tons of threads here about crushing black sand, but I need new advice.

    So, I ran about 1/2 gallon of black sand that I know contains micro gold through a coffee grinder(dry) and it wore the stainless steel blade down FAST. I mean the blade like slowly melted away.

    But then I ran that bucket through a cleanup sluice and WOW- the micro gold was amazing. Like 100+ pieces of it. Maybe like 400-500 mesh. The stuff that starts to be so small you can't see. ( sorry no pictures)




    My question is, I've heard some of y'all use a cast iron mortal and pestle. Amazon sells all sorts of types. Even stainless steel ones.

    I can't get a ball mill/tumbler with steel balls because it's too expensive, but some of these cast iron mortars are like $30.


    Which one do you guys use? What is the cheapest way to grind black sand? I love the coffee grinder because it gets it down to dust. But the blade just wears out too fast to be cost effective.

    Any help is much appreciated.

  2. #2
    us
    Author of a book about finding gold in Colorado

    Jan 2012
    Summit County, Colorado
    Grizzly Goldtrap Explorer & Motherlode, Gold Cube with Banker on top, Bazooka Goldtrap sluices, Angus Mackirk Expedition, Gold-n-Sand Xtream Hand pump
    6,917
    10988 times
    Prospecting
    Quote Originally Posted by FiresEye View Post
    I've read tons of threads here about crushing black sand, but I need new advice.

    So, I ran about 1/2 gallon of black sand that I know contains micro gold through a coffee grinder(dry) and it wore the stainless steel blade down FAST. I mean the blade like slowly melted away.

    But then I ran that bucket through a cleanup sluice and WOW- the micro gold was amazing. Like 100+ pieces of it. Maybe like 400-500 mesh. The stuff that starts to be so small you can't see. ( sorry no pictures)




    My question is, I've heard some of y'all use a cast iron mortal and pestle. Amazon sells all sorts of types. Even stainless steel ones.

    I can't get a ball mill/tumbler with steel balls because it's too expensive, but some of these cast iron mortars are like $30.


    Which one do you guys use? What is the cheapest way to grind black sand? I love the coffee grinder because it gets it down to dust. But the blade just wears out too fast to be cost effective.

    Any help is much appreciated.
    There’s some threads here from 5-7 years ago where we discuss bench-top rod mills in detail. I built one- works great!

  3. #3
    us
    May 2014
    AZ
    Beach High Banker, Sweep Jig, Whippet Dry Washer, Lobo ST, 1/2 width 2 tray Gold Cube, numerous pans, rocker box, and home made fluid bed and stream sluices.
    2,174
    3170 times
    Prospecting
    Quote Originally Posted by KevinInColorado View Post
    There’s some threads here from 5-7 years ago where we discuss bench-top rod mills in detail. I built one- works great!
    The thread mentioned above is titled "simple solution to fine gold recovery".
    Get a set of progressively smaller screen mesh sieves and pan the batches separately...gold weighs 3 to 5 times as much as other equally sized particles so panning efforts are maximized if you pan the batches sepatately.
    Any mortar pestle set should work to crush and grind.

    Good luck
    If it can't be grown, it must be mined!

  4. #4
    us
    Author of a book about finding gold in Colorado

    Jan 2012
    Summit County, Colorado
    Grizzly Goldtrap Explorer & Motherlode, Gold Cube with Banker on top, Bazooka Goldtrap sluices, Angus Mackirk Expedition, Gold-n-Sand Xtream Hand pump
    6,917
    10988 times
    Prospecting

    Crushing black sands- What I've tried and a question.

    Here’s my usual method of cons processing https://findinggoldincolorado.com/fi...ay-of-digging/
    ...which doesn’t include crushing
    Last edited by KevinInColorado; Jun 22, 2020 at 01:50 PM.

  5. #5
    us
    Mine President, XPBC, XGIH, GDR, stamp mill operator, snuffer bottle owner/operator.

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
    874
    1016 times
    Prospecting
    Rod mills are easy, find an old rock tumbler and use chunks of steel rod as a grinding media. The cast iron mortar and pestle I use was around the tune of 120 bucks, got it from Lunds in Mound House NV. Its about the biggest you can get. I have a small one I carry in the truck for sampling hard rock ores. Have you tried heating and quenching your sands?
    Last edited by N-Lionberger; Jun 29, 2020 at 08:41 PM.

 

 

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