Drop Riffle Sluice / Angus MacKirk - capturing fine (flour) gold - Page 2
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Thread: Drop Riffle Sluice / Angus MacKirk - capturing fine (flour) gold

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  1. #16
    us
    Jun 2013
    El Dorado County
    ROCKING GOLD GRABBER MINI- BGT PROSPECTOR- ANGUS MACKIRK EXPLORER- MILLER TABLE, MULTIPLE SUCKER TUBES, VARIOUS HAND TOOLS, PANS AND CLASSIFERS, FORS GOLD PLUS, MINELAB PRO 25 PINPOINTER- DIY ROD MILL
    1,491
    3252 times
    All Types Of Treasure Hunting
    I have no problem catching dust with my Angus Mackirk drop riffle.... In fact it has the best recovery imo, but you have to have proper exchange going. It's not about water speed and angles. If the material exchanges properly then it will catch. if it's getting packed up then it will blow gold all over the place
    Quote Originally Posted by GoldDoozah View Post
    The fact that homo sapiens teach genetically engineered canines tricks, on the third planet of this particular star in the Milky Way, is extremely unlikely.

  2. #17
    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.
    2,201
    3255 times
    Prospecting
    Check this drop riffle design out. Note that he has it set up in a switchback design as a highbanker.

    Goodyguy, Reed Lukens and russau like this.
    If it can't be grown, it must be mined!

  3. #18

    Sep 2014
    Midwest, North of 3660'
    3,758
    7188 times
    All Types Of Treasure Hunting
    Quote Originally Posted by arizau View Post
    Check this drop riffle design out. Note that he has it set up in a switchback design as a highbanker.

    That first drop down ain't catching nothing. The material does not appear to have been classified, he's sending it down in clumps. I didn't even watch the whole thing.

    ETA- it's not a bad design for a sluice, but it needs adjustment IMO.
    Last edited by Duckshot; Feb 24, 2020 at 11:39 AM.
    RTR and russau like this.
    "Ah! But a man's reach should exceed his grasp, or what's a Heaven for?" - R. Browning.

    'When you wish upon a star, makes no difference who you are
    everything your heart desires will come to you'
    - Cliff Edwards

    Choose your heroes carefully. In God We Trust.

  4. #19
    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.
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    Quote Originally Posted by Duckshot View Post
    That first drop down ain't catching nothing. The material does not appear to have been classified, he's sending it down in clumps. I didn't even watch the whole thing.

    ETA- it's not a bad design for a sluice, but it needs adjustment IMO.
    That first tray seems to be doing a good job of stratifying material for the next 3 runs, similar to what the top tray on a gold cube does.
    Would be interesting to see just how much gold is being captured in the first run if any.

    GG~
    Last edited by Goodyguy; Feb 24, 2020 at 01:29 PM.
    Duckshot and russau like this.

  5. #20

    Sep 2014
    Midwest, North of 3660'
    3,758
    7188 times
    All Types Of Treasure Hunting
    I see what you are saying. But there has to be better ways to break stuff up than flat boarding it over deep drop riffles. In my favorite home built drop riffle the first 8" or so are 1/4", 1/8" deep dados spaced 1/4" apart. Imo it pays to have a drop riffle with a couple different shaped riffles. The plastic drop riffles that are just three feet of the same sized riffles never made much sense to me. If my sluice can't catch gold going past in a foot worth of riffles, I want to try different riffles.
    Goodyguy and russau like this.
    "Ah! But a man's reach should exceed his grasp, or what's a Heaven for?" - R. Browning.

    'When you wish upon a star, makes no difference who you are
    everything your heart desires will come to you'
    - Cliff Edwards

    Choose your heroes carefully. In God We Trust.

  6. #21
    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.
    6,093
    5656 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Duckshot View Post
    I see what you are saying. But there has to be better ways to break stuff up than flat boarding it over deep drop riffles. In my favorite home built drop riffle the first 8" or so are 1/4", 1/8" deep dados spaced 1/4" apart. Imo it pays to have a drop riffle with a couple different shaped riffles. The plastic drop riffles that are just three feet of the same sized riffles never made much sense to me. If my sluice can't catch gold going past in a foot worth of riffles, I want to try different riffles.
    Good point!
    That's why I have decided on putting a multiple capture zone mat on top of the 24" long slick plate in front of the 18 rows of same size drop riffles on my high banker.

    Have you seen this one?........
    (keep clicking on image to enlarge)
    Click image for larger version. 

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    Mat is 10" X 27"
    Hey for $25 bucks I figure it's worth a shot.

    GG~
    Last edited by Goodyguy; Feb 24, 2020 at 07:07 PM.
    Gold4Mike and russau like this.

  7. #22
    us
    Dec 2019
    Salisbury NC
    29
    23 times
    Prospecting
    Yeah I have one of those mats, works alright. Still nothing compared to the Vortex Mat (the spirals, not the conveyer belt). That vortex mat catches everything
    Goodyguy likes this.

  8. #23
    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.
    6,093
    5656 times
    All Types Of Treasure Hunting
    Quote Originally Posted by X4FRNT View Post
    I’m thinking of building a fluid bed sluice to run behind my drop riffle, that way I can still run 1/4” material at a good pace and have the fluid bed capture the fines that are still trapped in the water current. Picked up the materials to make it yesterday at Lowe’s and plan on building it this evening. Worth a try I suppose.
    I am a firm believer of adding a fluidbed gold trap to the end of most any sluice!

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    It will definitely do the job if built right!

    Come to think of it, that's really all I need to do to my drop riffle highbanker sluice.
    Wish I didn't order that stupid mat now
    Thanks for the reminder


    GG~
    Last edited by Goodyguy; Feb 24, 2020 at 10:17 PM.

  9. #24
    us
    Jan 2012
    Oregon Coast
    White's V3i, White's MXT, and White's Eagle Spectrum Cleangold sluice & prospectors pan, EZ-Gold Pan, and custom cleanup sluice.
    1,484
    2218 times
    Beach mining, Metal detecting, Trading.
    I'll just stay with my Deep "V" mats.......


    russau and Goodyguy like this.
    We hold these truths to be self-evident: that all men are created equal; that they are endowed by their Creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness. Thomas Jefferson

    Which is also why we have the second
    amendment.

  10. #25
    us
    gravelSucker

    Aug 2011
    NY, AZ & NV
    Minelab 1000, A Motorized Power Glider Trike.
    301
    235 times
    Prospecting
    All of the matting, mods to the sluice and most people still don't invest in the sluice that is engineered to do the job right out of the box. Sure, I paid way more than most, but I've recouped that cost long ago. It is heavier than most, but, when engineering and math can outdo 200 year old "technology", go for it. THEN go get a Gold Well vortex drop riffle sluice, and leave the herd and "brand" loyalty in the rear view mirror.

    I've been using one for years... others kept asking me where is the "miner moss" and the "fly crap catcher" add-on is. If the sluices most are using were marvels of gravity flow and feed, why are these "options" necessary at all. Must be because of the finest engineering available and tons of advertising to build not the best equipment, but the best brand identification and loyalty to be had. Bernie M. was a phenomenal engineer, but a lousey market man. I'm glad that it is being produced in Massachusetts. Look on facebook and order up a real piece of equipment... not a toy.
    The view is always better with 500 feet of air under your buttocks.

  11. #26
    us
    retired bumb and part time Hobo

    May 2005
    St. Louis, missouri
    6,140
    4923 times
    I would think that instead of buying more different sluice's , try changing up on how you process your cons in a different manor and write down how the sluice works best on certain types of cons. Cons from different parts of states or different states are made up of different make ups (I.E. different mixtures of sand /gravel/clays ETC.) and therefore act differently in your sluice to some degree. maybe try adding material slower/less water/ more water/ different angle of the sluice / finer classification and so on to see if you can trap the finer gold better. and keep notes on everything for your records ! I never did like spending $$$$ when I don't need to !
    johnedoe and Goodyguy like this.

  12. #27
    us
    Dec 2019
    Salisbury NC
    29
    23 times
    Prospecting
    Well I made my final switch to using the goldrat vortex mat, or the dream mat. It catches everything.
    Goodyguy likes this.

  13. #28
    us
    Aug 2009
    White's MXT all pro, MXT300 D2, 950, 4X6 DD, detech ultimate 13" DD coils
    2,330
    905 times
    All Types Of Treasure Hunting
    I live in Indiana and the AM sluice I have has no problem catching the flour gold, I'm not sure you can find smaller pieces than I'm catching. I'm guessing your doing something wrong, the gold here has been ground into dust from the glaciers that brought it here.
    Ohiogoldfever likes this.

  14. #29
    us
    Rock stacker

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
    908
    1096 times
    Prospecting
    I built a sluice end fluid bed trap based on Goodguys design for my highbanker, I found it did capture gold but it wasn't much, the likelyhood of gold fine enough to float over my riffles being able to get through a screen into a positive pressure fluid bed chamber is fairly low. Adding a flare to a wider sluice gets the fines. Why a Letrap works so well is the pinched design, I'm confident any riffle design would work well in a pinched sluice.
    Ohiogoldfever likes this.

  15. #30

    Oct 2020
    19
    16 times
    All Types Of Treasure Hunting
    I’ve had good luck catching fines in my Angus and my Le traps. In My area of Ohio I don’t find any big gold so I’m only running fines. I have thought about adding a secondary capture mat to the bottom of the drops. Something to help keep the heavier stuff locked in once it’s down there. Hell idk, I think half the fun is pricking around in the garage changing up your contraptions with the data gathered from the last bout in the creek.

 

 
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