I call it the double stack RPE
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  1. #1
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting

    I call it the double stack RPE

    So I took two of my retired RPEís and made a over/under style sluice. Kind of like the Spikes Double sluice setup. Took it out this past weekend and it worked really well! With a few minor adjustments it will do exactly what I want. Iíd like to be able to shovel on without classifying and keep the larger stones out of my riffles, Iíll put it through a hard test to see how it does this weekend. Thoughts?

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    russau and monte_rivers like this.

  2. #2
    us
    Rock stacker

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
    986
    1284 times
    Prospecting
    Never heard of an RPE sluice before. I run over under on my dredge sluice it has to waterfall off the end as the undercurrent has fully submerged riffles you have to deal with the friction of the water against the roof. If the end of the sluice dips under water the back pressure can shut down the undercurrent, also seems to help if there is some material extending off the end of the sluice so the top flow waterfalls off after the bottom sluice.

  3. #3
    us
    retired bumb and part time Hobo

    May 2005
    St. Louis, missouri
    6,344
    5294 times
    I like your idea ! Now to get enough water to make it work correctly !
    Goodyguy, Fat, DizzyDigger and 1 others like this.

  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
    5,274
    19340 times
    All Types Of Treasure Hunting
    Throw some gold flakes in it(and a gold pan at the end to catch em and) see what happens
    wildminer, Goodyguy and Fat like this.

  5. #5
    MAGA

    Dec 2015
    Jefferson Coast
    574
    851 times
    Prospecting
    Not sure what that screen is, but if material hangs up on it punch plate may be a better alternative. Nice experiment.
    Fat and Goodyguy like this.

  6. #6
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting
    I made a few adjustments, I made the bolts fully adjustable now so I can adjust each one to change the angle and water flow through the sluices. Also, in my first attempt I made a rookie error, the expanded metal riffles (1/8” I think, just a gutter guard from Lowe’s) were facing the wrong direction, causing the rocks to stick in them. I’m going to make a few different sized screens, that I can change in the field. 1/4” expanded metal, and 1/4” punch plate. Going out tomorrow to do a good run with the sluice, I’ll post my results!
    Goodyguy, Fat and russau like this.

  7. #7
    us
    Rock stacker

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
    986
    1284 times
    Prospecting
    Doesn't matter what type of screen it is small triangular rocks are going to get stuck in there.
    Goldwasher, Goodyguy, Fat and 1 others like this.

  8. #8
    us
    May 2009
    Sailor Flat, Ca.
    SDC2300, Gold Bug 2 Burlap, fish oil, .35 gallons of water per minute.
    5,974
    13047 times
    All Types Of Treasure Hunting
    Banner Finds (1)
    Quote Originally Posted by N-Lionberger View Post
    Doesn't matter what type of screen it is small triangular rocks are going to get stuck in there.
    especially plastic.

    I tried to make abs punch one time.

    total fail.

    rocks are harder than plastic they dug right in and stuck.
    Goodyguy and russau like this.

  9. #9
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting
    I used expanded metal 1/2”, the screen worked great this past weekend. I tested it with my pan at the end of the sluice and did about 10-12 shovels of material. Cleaned out the sluice and found a fair bit of gold for the amount I ran, I panned out the tailings and found one minuscule speck. You can see on my YouTube page, I’m quite pleased with it.

    Duckshot and monte_rivers like this.

  10. #10

    Sep 2014
    Midwest, North of 36į60'
    4,281
    9100 times
    All Types Of Treasure Hunting
    Quote Originally Posted by N-Lionberger View Post
    Never heard of an RPE sluice before. I run over under on my dredge sluice it has to waterfall off the end as the undercurrent has fully submerged riffles you have to deal with the friction of the water against the roof. If the end of the sluice dips under water the back pressure can shut down the undercurrent, also seems to help if there is some material extending off the end of the sluice so the top flow waterfalls off after the bottom sluice.
    Yep. Let the tail of your sluice cascade. I'm not exactly sure if it's back pressure or suction, but I catch more fines with my drop riffles if the tail is out of the stream.
    russau likes this.
    "Do Not do to others that which you would Not have them do to you"

    Choose your heroes carefully.

    In God We Trust.

  11. #11
    us
    retired bumb and part time Hobo

    May 2005
    St. Louis, missouri
    6,344
    5294 times
    Quote Originally Posted by Duckshot View Post
    Yep. Let the tail of your sluice cascade. I'm not exactly sure if it's back pressure or suction, but I catch more fines with my drop riffles if the tail is out of the stream.
    I've heard this for ever ! And this is how I operated my dredge's ! I can hear "Hoser " saying this right now!!

  12. #12
    us
    Rock stacker

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Dowsing rods
    986
    1284 times
    Prospecting
    You could make your opening to the undercurrent wider and put in a piece of sheet metal that can be slid back and forth to regulate how much goes down, I have seen some dredge undercurrents set up like that.
    wildminer and russau like this.

  13. #13
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting
    I modified it with a bolt on the end, that way I can change the angle of the back of the sluice, making the back of the sluice more open than the front the water acts like a vacuum where the screen is. Here is the finished sluice, as you can see I added 1/2” punch plate, and changed the bolts so they sit flush on the top sluice. Works like a dream! Eric from Robinson Prospecting Equipment sent me two RPE Extensions, roughly 24” long, so I may experiment with an extended double stack RPE. Click image for larger version. 

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  14. #14
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting
    Made one all in black yesterday, looks sharp and works great. Ram it hard at the river today, did about 300 shovels of material (sticky clay and gravels). Found quite a bit of color in the first couple cleanups, took the rest of the cleanups home to process. Click image for larger version. 

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    russau and DizzyDigger like this.

  15. #15
    us
    Dec 2019
    Salisbury NC
    47
    55 times
    Prospecting
    Let me know what y’all think! Thanks!
    russau likes this.

 

 
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