Building an oversized classifer
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  1. #1
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,522
    6092 times
    Prospecting

    Building an oversized classifer

    After using a regular, bucket top sized classifier since I was
    young, I broke down last year and built a manual trommel.
    The trommel works great for dry material, but without a
    spraybar, pump, etc. it's near worthless for classifying
    the wet, rocky riverbank gravel.

    The bucket top classifiers just wear my ass out, and the
    constant up-down, lifting and shaking, etc. throws my
    equilibrium way out of whack. They also don't classify
    much material at one time.

    So, what to do?

    Chewed on it for a few days, and came up with an idea of
    using a large tub to hold the classified material, and then
    use a smaller tub as the classifier.

    I wanted to make the classifying action (back, forth, etc) as
    smooth as possible, so I added strips of cutting board material
    (made of poly-something) to the bottom of the classifier
    tub runners, and on the top of the rails mounted to the large
    tub.

    Might be easier to make sense out of in pictures:

    Click image for larger version. 

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    The large tub is a 38 gal. Roughneck, and the classifier tub
    is a 10 ga. Roughneck. First was cutting the bottom of the
    10 gal. tub and installing the 1/8" screen, and then adding
    the rails to both tubs. Overall it took about 6 hrs. to complete,
    and no doubt some of you could build it much quicker.

    Couple more shots:

    Click image for larger version. 

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    Click image for larger version. 

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    Tried it out yesterday afternoon by a local creek, and it worked
    fantastic! The rails hold all the weight, and the classifier tub slides
    back and forth on the hard plastic runners like it's on ice. Took me
    only 15 min. to dig and classify about 30 gal. of -1/8" material ...

    (p.s. ran it all through the Cube and didn't get squat..)
    Last edited by DizzyDigger; Mar 13, 2014 at 09:05 PM.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

  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
    6,785
    10627 times
    Prospecting
    Nice work, those hard plastic runners are da bomb!
    DizzyDigger likes this.

  3. #3

    Feb 2014
    NorCal
    167
    256 times
    Prospecting
    I like the looks of that a lot.
    goldenmojo likes this.

  4. #4
    us
    Feb 2014
    longview wa.
    2
    2 times
    Prospecting
    Quote Originally Posted by DizzyDigger View Post
    After using a regular, bucket top sized classifier since I was
    young, I broke down last year and built a manual trommel.
    The trommel works great for dry material, but without a
    spraybar, pump, etc. it's near worthless for classifying
    the wet, rocky riverbank gravel.

    The bucket top classifiers just wear my ass out, and the
    constant up-down, lifting and shaking, etc. throws my
    equilibrium way out of whack. They also don't classify
    much material at one time.

    So, what to do?

    Chewed on it for a few days, and came up with an idea of
    using a large tub to hold the classified material, and a then
    use a smaller tub as the classifier.

    I wanted to make the classifying action (back, forth, etc) as
    smooth as possible, so I added strips of cutting board material
    (made of poly-something) to the bottom of the classifier
    tub runners, and on the top of the rails mounted to the large
    tub.

    Might be easier to make sense out of in pictures:

    Click image for larger version. 

Name:	DSC_0047-1.JPG 
Views:	276 
Size:	415.5 KB 
ID:	959382

    The large tub is a 38 gal. Roughneck, and the classifier tub
    is a 10 ga. Roughneck. First was cutting the bottom of the
    10 gal. tub and installing the 1/8" screen, and then adding
    the rails to both tubs. Overall it took about 6 hrs. to complete,
    and no doubt some of you could build it much quicker.

    Couple more shots:

    Click image for larger version. 

Name:	DSC_0043=1.JPG 
Views:	271 
Size:	222.6 KB 
ID:	959395

    Click image for larger version. 

Name:	DSC_0041-1.JPG 
Views:	239 
Size:	302.3 KB 
ID:	959396

    Tried it out yesterday afternoon by a local creek, and it worked
    fantastic! The rails hold all the weight, and the classifier tub slides
    back and forth on the hard plastic runners like it's on ice. Took me
    only 15 min. to dig and classify about 30 gal. of -1/8" material ...

    (p.s. ran it all through the Cube and didn't get squat..)
    very nice build I like it a lot dizzy.now maybe think of putting a handle on one end high enough to stand up and shake it as I agree it's a pain/w bucket classifiers.maybe an inverted u shape or wrap it underneath for more strength.or tell me to myob. lol

  5. #5
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,522
    6092 times
    Prospecting
    Just realized there's no side view of the large tub. What is not
    shown, above, are the 1x4's on the outside of the large tub that
    provide a good deal of added support for the 2x4 rails on the
    inside.

    Basic material list:

    1 - 38 Gal. roughneck tub
    1 - 10 Gal. roughneck tub
    1 - 4' 2x2
    1 - 4' 2x4
    1 - 8' 1x4
    1 - 20" x 20" piece of screen of whatever mesh size you choose
    20 - #8 x 1/2" machine screws (with washers and nuts)
    10 - 5/16 x 2-1/2" Carriage Bolts (with washers and nuts)

    Chasin: I always appreciate suggestions, so no worries. BTW, welcome
    to the forum!

    Beauty of this is, before I start classifying I'll set it up on top
    of 4, flipped over 3 Gal. buckets. This way the classifying is done
    almost waist high, and the forward/back motion requires little
    effort. Ya still gotta shake it up good, however, but it takes just
    a few good shakes to classify 2-3 gal. of unclassified material.

    The classifying tub can handle 2-3 gal. of material at a time, and the bottom
    was cut leaving the crossing strips to support the screen and material.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

  6. #6

    May 2005
    St. Louis, missouri
    5,849
    4471 times
    now all you need is some sort of vibration to help you in your classification!
    DizzyDigger likes this.

  7. #7
    us
    Mar 2012
    Idaho
    Gold Hog Stream Sluice
    436
    996 times
    Prospecting
    Did the same thing two years ago. I used a milk crate lined it with " hardware cloth as my classifier.
    See Pics HERE
    Bob
    Just because you CAN do something, doesn't mean you SHOULD.
    Visit my Idaho Gold Prospecting Blog at Bedrock or Bust
    US Army Pacific 1969-1971
    2015 Stroke Survivor
    2016 Cancer Survivor
    2017 2nd Stroke Survivor
    2018 Pacemaker Recipient
    Every Day Is A Beautiful Day

  8. #8
    us
    FIRE...Financially Independent Retired Early. Poor but free!

    Feb 2013
    Deep in the redwoods of the TRUE Northern CA
    Teknetics Alpha 2000
    2,624
    4092 times
    Prospecting
    I like em both! Great job guys and thanks for sharing!
    Bob...I remember seeing that type of dredge on your link. I was just a kid in Warren ID...probably 45 years ago. It was abandoned and the buckets disappeared into the ground. It sure was BIG! I just was in awe of it and wondered what it looked like and how it sounded back in it's day. That is one of the best pictures I have seen of one.

    Mike...what did you use to cut the plastic out of the bottom...jig saw? Any surprises/doh's during the field test?
    We don't fight for gain. We fight for what is rightfully ours.

    Just another supporter of Land Matters http://www.mylandmatters.org/ The one stop place for mining matters on public lands!

    CA prospectors check here http://www.mylandmatters.org/Donate/Gift1.html

    A recent study found that there are just too many studies being done.

  9. #9
    us
    This isn't a hobby! It's hard work!

    Feb 2013
    Golden Valley Arid-Zona
    Fisher / Gold Bug AND the MK-VII eyeballs
    3,465
    6155 times
    Prospecting/Mining and protecting our rights to do so.
    Good job Mike! That super slick plastic is great for a lot of things! Makes great jigs for shop tools as well as facings for rip fences on a table saw.
    http://www.mylandmatters.org/
    The one stop place for mining matters on public lands!

    "Those that make peaceful revolution impossible will make violent revolution inevitable" John F. Kennedy

    When I joined the Army I took an oath to protect this country from enemies both foreign and domestic. To the best of my knowledge I've never been relieved of that oath and will continue to follow it to the best of my ability.

  10. #10
    us
    why havent I been gold prospecting lately?

    Dec 2013
    next to disneyland
    Thanks Kellyco, and Garrett:smile:... I love my AT gold metal detector!
    469
    220 times
    Prospecting
    American innovation at work!
    I love it.
    DizzyDigger and goldenmojo like this.

  11. #11
    us
    Dan Gamache

    Aug 2013
    East Mesa, Arizona
    Garrett Deepseeker ADS
    333
    115 times
    Prospecting
    Great idea and the only problem I can see is that it is made out of plastic tubs. I give it two seasons. It would be much better if you could make it out of galvanized stock tanks.
    DizzyDigger and BillA like this.

  12. #12
    Charter Member
    us
    Jim Bowers

    Mar 2013
    Hendricksville Indiana
    447
    475 times
    Prospecting
    Borrowed this photo from a friend on another site. Click on pic for a closer look. Click image for larger version. 

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    Last edited by Jimmydolittle; Mar 13, 2014 at 06:34 PM. Reason: clarification

  13. #13
    us
    Dec 2012
    Concrete, WA
    Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
    3,522
    6092 times
    Prospecting
    Quote Originally Posted by Jeff95531 View Post
    Mike...what did you use to cut the plastic out of the
    bottom...jig saw? Any surprises/doh's during the field test?
    Jeff, I just used a sharp knife to make the cuts. Thought about using
    a jigsaw, but the knife made the job easy.

    Was out today working one of the local creeks with the Cube, and
    packed the classifier tub along. I only had to walk about 40 yds.
    up the creek to reach the place where I was working, but any further
    and hauling either the Cube or the classifier tub in would be quite
    a challenge.

    Material I was working today, unlike beach sand with some rocks in
    it, this material is rocks with some dirt/gravel packed in around them.
    Learned that it works best from the long side, and by grabbing the handles
    on the classifier tub I could shake the bejesus out of the material.

    Once classified, I just set one edge of the classifier tub on the edge
    of the large tub and dumped it over the side (like a dump truck). Fed
    it a 3 gal. bucket of unclassified material at a time. The only downside
    is that you are going to get wet if'n you're not careful..lol

    Nightstalkingfurball: Odds are I'll have to replace the 1/8" screen before
    this season is over, but those roughneck tubs are tougheranell, and should
    last me at least 2 seasons. No biggie, really, as we have a long, cold winter
    between seasons and it won't cost squat to refurbish it in the off season.

    Jimmy, I like the idea, but it would be difficult to get the rocks washed
    well enough as they are sliding down the screen. I take the larger rocks
    (baseball sized and bigger) and wash them in the tub independently of
    classifying, just to be sure I don't leave any gold stuck to one.
    Last edited by DizzyDigger; Mar 14, 2014 at 03:06 AM.
    Mike (aka Dizz)

    "If you love wealth better than liberty, the tranquillity of servitude better than the animating contest
    of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick
    the hands which feed you. May your chains set lightly upon you, and may posterity forget that you
    were our countrymen." ~~ Samuel Adams, 1776

    Dizzy's Super-Simple, Universal Rule of Forum Conduct: Don't be an ass.

  14. #14

    May 2012
    899
    511 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Jimmydolittle View Post
    Borrowed this photo from a friend on another site. Click on pic for a closer look. Click image for larger version. 

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    That's great! Just need to add a puffer to that!!
    elgatodelnoche likes this.

  15. #15
    us
    Oct 2012
    Southern California
    A cheap little Bounty Hunter
    450
    290 times
    All Types Of Treasure Hunting
    Very good. I love seeing how inventive miners are. I am always amazed. So I thought I should share as well.
    Click image for larger version. 

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    I have a select set of gear I like to have with me and this is the best way I found to get it to the river.
    Sometimes hike and sometimes bike.
    My biggest problem is just getting outta town.
    I haven't been mining in 3 months, it really sucks.
    Last edited by Aurabbit79er; Mar 17, 2014 at 05:56 PM. Reason: spelling
    In all the advancing we can do to improve this world, the sharing of knowledge and wisdom is the most important.
    We stand on the shoulders of giants.
    I am so glad I joined this Message board.
    If I post anything that inspires anyone to do better mining then me, I did my part.
    And If anyone inspires me to try something new, or better, I thank them now.

 

 
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