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

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  1. #1
    us
    Dec 2019
    Salisbury NC
    28
    22 times
    Prospecting

    Drop Riffle Sluice / Angus MacKirk - capturing fine (flour) gold

    I have two drop riffle sluices, a Angus MacKirk and a Robinsonís Brothers drop riffle sluice. They work great for capturing the larger gold flakes, but the flour and fine gold I find in my test pans are not being caught in either of my sluices.

    I run the sluices with proper water flow and angled correctly and run classified material to 1/4Ē. After watching docís vid on Proportional Force multiple times I feel as though the fine gold doesnít fall out into the drop riffles because the lack of disturbance/disruptions when using a drop riffle sluice. Angle and water flow play into this problem, lack of either means that it takes longer to clean the riffles and less material can be run through the sluice. Just wondering if anyone else is having similar issues, or if anyone has any advice on how to capture the fines from that upper water column.

    Iíve been thinking of running the Robinson Sluice paired with the Angus behind it, and adding a damper before the material enters the Angus sluice. This would force the fine gold down into the lower water column and give it a chance to drop into the riffles. Iíll give it a try at least.

    Thoughts?
    russau likes this.

  2. #2
    RTR
    RTR is offline
    us
    Roger. USAF Vietnam war Combat Vet

    Nov 2017
    Smith Mt. Lake Va.
    Teknetics Liberator Falcon MD-20 *********** Blue Bowl Angus MacKirk sluice Miller Table
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    Love my MacKirk(for what it is) If you want to capture (flour) gold your better of getting a miller table.
    russau likes this.

  3. #3
    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
    6,946
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    Iíve been running an AM Expedition for years. Several options:
    1. Run the sluice with less water depth.
    2. Classify to 8 mesh and run with less pitch& flow
    3. Both 1&2
    The sluice is capable if run for the conditions you face.

  4. #4
    RTR
    RTR is offline
    us
    Roger. USAF Vietnam war Combat Vet

    Nov 2017
    Smith Mt. Lake Va.
    Teknetics Liberator Falcon MD-20 *********** Blue Bowl Angus MacKirk sluice Miller Table
    4,316
    15462 times
    All Types Of Treasure Hunting
    One way to find out if the Angus is leaving fine gold behind. After you are all done running the material Place the material





    into a pan with a few drops of liquid dish soap or Jet dry (used in dishwashers). This will break the surface tension of the water ,keeping fine (minus 100 mesh gold in the pan) from washing away.
    Last edited by RTR; Jan 31, 2020 at 11:22 AM.

  5. #5

    Sep 2014
    Midwest, North of 36į60'
    3,752
    7154 times
    All Types Of Treasure Hunting
    I have used a home built wooden drop riffle sluice to catch a bit of gold dust in WI. The thing is I have exactly no idea how much gold I might have lost, but I'm sure it isn't catching every grain. The only way to see exactly how much a sluice loses is to pan out everthing you originally ran through it. But, how do you know you are catching everthing in your panning?

    Sluice it all again and pan it again?

    It ain't a bad idea to test your tailings, but at a certain point you are better off just running fresh dirt.
    Goldwasher and russau like this.
    "Ah! But a man's reach should exceed his grasp, or what's a Heaven for?" - R. Browning.

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  6. #6

    Dec 2013
    17
    15 times
    All Types Of Treasure Hunting
    I have a large Mad Miner's sluice that I have removed the riffles out of. I have a 17 inch flare followed by 10 inches of inspection mat. This is followed by 17
    inches of deep V mat. Next there is 6 inches of mother load mat. This is working very well on fine gold. I screen to 1/4 inch. I got help, information, from
    John Doe. I am working a spot with only fine flood gold. Take a look at John Doe's posts.

    Lefty2u

  7. #7
    Charter Member
    us
    Wolf Pack!

    Jan 2014
    Brookings-Harbor Oregon
    Bounty hunter gold digger Keene A52 with Gold Hog mats Keene A52P Blue Bowl Gold-N-Sand hand dredge
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    Gold Hog mats.







    Freedom is something that dies unless it's used.


    Time is like a river. You cannot touch the same water twice, because the flow that has passed will never pass again. Enjoy every moment of your life.

    A student said to his master, "You teach me fighting, but you talk about peace. How do you reconcile the two?"
    The master replied, "It is better to be a warrior in a garden, than to be a gardener in a war."

  8. #8
    us
    Dec 2019
    Salisbury NC
    28
    22 times
    Prospecting
    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.
    Goodyguy and russau like this.

  9. #9
    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.
    2,198
    3247 times
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    Quote Originally Posted by X4FRNT View Post
    I have two drop riffle sluices, a Angus MacKirk and a Robinson’s Brothers drop riffle sluice. They work great for capturing the larger gold flakes, but the flour and fine gold I find in my test pans are not being caught in either of my sluices.

    I run the sluices with proper water flow and angled correctly and run classified material to 1/4”. After watching doc’s vid on Proportional Force multiple times I feel as though the fine gold doesn’t fall out into the drop riffles because the lack of disturbance/disruptions when using a drop riffle sluice. Angle and water flow play into this problem, lack of either means that it takes longer to clean the riffles and less material can be run through the sluice. Just wondering if anyone else is having similar issues, or if anyone has any advice on how to capture the fines from that upper water column.

    I’ve been thinking of running the Robinson Sluice paired with the Angus behind it, and adding a damper before the material enters the Angus sluice. This would force the fine gold down into the lower water column and give it a chance to drop into the riffles. I’ll give it a try at least.

    Thoughts?
    To me it seems like not catching the fine gold is evidence that the riffles are packing up and not constantly "dancing" or exchanging. Not only can that cause you to lose fine gold but some of the larger particles too since they cannot penetrate the capture areas and are just swept across the top of them and out of the sluice. Swifter current and or steeper angle on the sluce may remedy this. Have you seen the videos here? https://www.google.com/search?q=angu...hrome&ie=UTF-8. A couple of those show pretty extreme flow. I would say, run it flat in swift current and steepen it in slower flows.

    Good luck.
    Last edited by arizau; Feb 01, 2020 at 05:28 PM.
    If it can't be grown, it must be mined!

  10. #10
    us
    May 2017
    Mount Vernon, Washington
    Angus Mackirk Foreman Grizzly Goldtrap Explorer Gold Hog Piglet highbanker Home made slate miller table
    196
    546 times
    Prospecting
    I've got an Angus Mackirk and it catches very fine gold. It can be a little difficult to run one sluice behind another, but you can sure test the losses of either one of your sluices by running the other right off the first. It would be an interesting test of either one.
    RTR and KevinInColorado like this.

  11. #11
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
    5,887
    12805 times
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    Banner Finds (1)
    if the first sluice doesn't catch fine gold.. it isn't gonna get caught in second sluice.

    No matter what type the second is.

    The best bet for getting more gold in your sluice. Is to run dirt that has more gold in it.
    russau likes this.

  12. #12
    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
    6,946
    11095 times
    Prospecting
    Quote Originally Posted by Goldwasher View Post
    if the first sluice doesn't catch fine gold.. it isn't gonna get caught in second sluice.

    No matter what type the second is.

    The best bet for getting more gold in your sluice. Is to run dirt that has more gold in it.
    Often true.
    Unless the first sluice sucks or is set up poorly. I once put a fluid bed below a friendís WolfTrap Hungarian riffle sluice and it was amazing how much gold I caught. The friend was just horrified lol!

  13. #13
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, ACME handbook for TRUE prospectors (unread)
    5,887
    12805 times
    All Types Of Treasure Hunting
    Banner Finds (1)
    Quote Originally Posted by KevinInColorado View Post
    Often true.
    Unless the first sluice sucks or is set up poorly. I once put a fluid bed below a friend’s WolfTrap Hungarian riffle sluice and it was amazing how much gold I caught. The friend was just horrified lol!
    True if the first sluice isn't good hopefully the second will catch some. I guess what i'm getting at is if the first one is working right the second isn't gonna kick in on what isn't held by the first.

    I was mainly referring to the fine gold that is at the lower end of the catch rate anyways.. That if water speed has kept it moving... is very unlikely to drop out of suspension.
    KevinInColorado and russau like this.

  14. #14
    us
    Jan 2016
    South of Gunnison, Gold Basin
    F2
    2,084
    2499 times
    Prospecting
    It's like tossing fish back that are too small. Letem grow a little more!
    Goldwasher likes this.

  15. #15
    us
    Dec 2019
    Salisbury NC
    28
    22 times
    Prospecting
    Quote Originally Posted by Johnnybravo300 View Post
    It's like tossing fish back that are too small. Letem grow a little more!
    😂 thatís how Iíll view it from now on. (If only it worked that way).

 

 
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