I call it the double stack RPE

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
So I took two of my retired RPE’s 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. I’d like to be able to shovel on without classifying and keep the larger stones out of my riffles, I’ll put it through a hard test to see how it does this weekend. Thoughts?

77658042-98AF-43B5-9270-F7575FA0BE48.jpeg
2DFAC884-3635-47D1-BBB8-56150304FF0F.jpeg
0E2EAB85-77C7-4C98-AA2C-40D45CCDA011.jpeg
D70B3B14-60AC-4512-B7D4-33A8175B8415.jpeg
 

N-Lionberger

Bronze Member
Dec 1, 2013
1,198
1,696
Arcata, California
Detector(s) used
Fisher 1212-x
Fisher Gold Bug 2
Whites 4900/SP3
Dowsing rods
Primary Interest:
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.
 

RTR

Gold Member
Nov 21, 2017
8,180
32,431
Smith Mt. Lake Va.
Detector(s) used
Teknetics Liberator
Falcon MD-20
***********
Blue Bowl
Angus MacKirk sluice
Miller Table
Primary Interest:
All Treasure Hunting
Throw some gold flakes in it(and a gold pan at the end to catch em and) see what happens
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #6
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!
 

N-Lionberger

Bronze Member
Dec 1, 2013
1,198
1,696
Arcata, California
Detector(s) used
Fisher 1212-x
Fisher Gold Bug 2
Whites 4900/SP3
Dowsing rods
Primary Interest:
Prospecting
Doesn't matter what type of screen it is small triangular rocks are going to get stuck in there.
 

Goldwasher

Gold Member
May 26, 2009
6,059
13,172
Sailor Flat, Ca.
🥇 Banner finds
1
Detector(s) used
SDC2300, Gold Bug 2 Burlap, fish oil, .35 gallons of water per minute.
Primary Interest:
All Treasure Hunting
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.
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #9
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

Silver Member
Sep 8, 2014
4,455
9,638
trapped on the earthly plane of causation
Primary Interest:
All Treasure Hunting
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

Gold Member
May 29, 2005
6,935
6,254
St. Louis, missouri
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!!:occasion14:
 

N-Lionberger

Bronze Member
Dec 1, 2013
1,198
1,696
Arcata, California
Detector(s) used
Fisher 1212-x
Fisher Gold Bug 2
Whites 4900/SP3
Dowsing rods
Primary Interest:
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.
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #13
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. 0A56AC9C-7FA5-48D8-BBD2-3015E85FB53C.jpeg
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #14
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. B5E31F87-2D65-4CD0-BEEC-0D177067379B.jpeg 4E5F0ED9-BDD7-4994-8F13-2B22B9104E3A.jpeg 42A59E7D-9326-453A-A3A8-563F96C8078B.jpeg E23A1316-55BE-4E8D-936D-0E2F1F3D56DB.jpg
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #17
Like a cleanup sluice? With maybe 1/8” punch plate? I’m sure I could set it up that way to process my cons. The reason I set it up this way is so I can run as much material as possible without having to classify at all at the river, and not having to worry about large rocks washing away my gold.
 

N-Lionberger

Bronze Member
Dec 1, 2013
1,198
1,696
Arcata, California
Detector(s) used
Fisher 1212-x
Fisher Gold Bug 2
Whites 4900/SP3
Dowsing rods
Primary Interest:
Prospecting
I don't see why you would use such a setup for cleanups, seems like its for production.
 
OP
X4FRNT

X4FRNT

Jr. Member
Dec 5, 2019
56
72
Salisbury NC
Primary Interest:
Prospecting
  • Thread Starter
  • Thread starter
  • #20
During my second trial with this sluice (using the expanded metal screen), I took the sluice apart with all the material still in each section and panned out each section separately. This is on film on my YouTube channel,
Though I did not film each cleanup, I did find the majority of the gold and black sands were in the bottom sluice. I will make another video soon showing a cleanup and the gold found in each of the sluices. Thanks!
 

Top Member Reactions

Users who are viewing this thread

Top