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Gold Prospecting Forums - General => General Gold Prospecting Forum => Topic started by: yicke on January 27, 2011, 08:02:08 AM

Title: Built my own drop trap sluice
Post by: yicke on January 27, 2011, 08:02:08 AM
Hi I have been viewing all the you tube footage on the bazookatrap sluice and I am  interested in this design.So useing materials I had I built a simalar sluice here are some photo's.

(http://gpex.ca/image-sharing/images/sluice001.jpg)

I used 3/8 spruce plywood,1-8 spruce and a peice of puck board

(http://gpex.ca/image-sharing/images/sluice003.jpg)

I glued and stapled everything together

(http://gpex.ca/image-sharing/images/sluice004.jpg)

(http://gpex.ca/image-sharing/images/sluice006.jpg)

I used 1 inch conduit.

(http://gpex.ca/image-sharing/images/sluice007.jpg)

(http://gpex.ca/image-sharing/images/sluice010.jpg)

The material I used for the grizzly is from a broken electrician snake I cut bent drilled holes and glued into place.

(http://gpex.ca/image-sharing/images/sluice011.jpg)

Lastly I covered with fyberglass bondo. Now I wait untill spring to rty it out.


Title: Re: Built my own drop trap sluice
Post by: muconium on January 27, 2011, 01:11:51 PM
These things are looking better and better to me. I've been waiting for drop traps to get a good reputation on this forum before I think about buying or building one.

They seem to take care of a lot of problems, don't they? No pump, fuel, etc. like a highbanker. No pre-classifying like an in-stream sluice...

Lookin' good!  <-good_>
Title: Re: Built my own drop trap sluice
Post by: Woodspirit on January 28, 2011, 05:49:30 AM
Yicke,

Great looking project.  {-applause-}
I'm anxious to see some videos of the sluice in action or at least some photos.

TJ
Title: Re: Built my own drop trap sluice
Post by: Toppossum on January 28, 2011, 10:38:42 AM
Very nice build.  I have been considering building a bazookatrap  type high banker.  Good luck with it.
Title: Re: Built my own drop trap sluice
Post by: jes_playin on January 28, 2011, 11:35:57 AM
I've been intrigued by the bazooka gold trap sluice since first seeing the youtube videos. I plan on building one myself as soon as I find the right materials. My brother-in-law works for a plastics company so I plan on seeing if he can get me some sheets of ABS plastic.
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on January 31, 2011, 10:58:06 AM
Here's my version of the gold trap sluice.

Its almost done, I just have to seal a couple seams on the back trap, and then add some more waterproofing.

I took pictures of it next to the bazooka to help show its dimensions.

My version is narrower then the Bazooka. I did this on purpose, when you have excessive width you are wasting energy that could be better spent moving overburden up and out of the sluice. Mine starts at 10 inches wide and tapers to 6 inches at the end. It continues tapering right up until the end because the narrower width should help push the oversize out of the sluice.

The first four pics is of the bottom section and the trap.

(http://img197.imageshack.us/img197/591/imgp5310a.th.jpg) (http://img197.imageshack.us/i/imgp5310a.jpg/)
(http://img89.imageshack.us/img89/1438/imgp5308k.th.jpg) (http://img89.imageshack.us/i/imgp5308k.jpg/)
(http://img89.imageshack.us/img89/3143/imgp5306.th.jpg) (http://img89.imageshack.us/i/imgp5306.jpg/)
(http://img404.imageshack.us/img404/8964/imgp5314u.th.jpg) (http://img404.imageshack.us/i/imgp5314u.jpg/)

Top part that tapers inward, plus the grizzly.  
(http://img517.imageshack.us/img517/8633/imgp5370.th.jpg) (http://img517.imageshack.us/i/imgp5370.jpg/)
(http://img517.imageshack.us/img517/5844/imgp5369.th.jpg) (http://img517.imageshack.us/i/imgp5369.jpg/)


Inside the bottom half of mine.
(http://img835.imageshack.us/img835/7411/imgp5376.th.jpg) (http://img835.imageshack.us/i/imgp5376.jpg/)

Bottom half of the bazooka.
(http://img404.imageshack.us/img404/7449/imgp5377.th.jpg) (http://img404.imageshack.us/i/imgp5377.jpg/)

And then side by side photos of mine next to the bazooka.
(http://img573.imageshack.us/img573/7915/imgp5375.th.jpg) (http://img573.imageshack.us/i/imgp5375.jpg/)
(http://img41.imageshack.us/img41/5526/imgp5382.th.jpg) (http://img41.imageshack.us/i/imgp5382.jpg/)

(http://img138.imageshack.us/img138/6140/imgp5378v.th.jpg) (http://img138.imageshack.us/i/imgp5378v.jpg/)

(http://img717.imageshack.us/img717/4623/imgp5381.th.jpg) (http://img717.imageshack.us/i/imgp5381.jpg/)
(http://img714.imageshack.us/img714/6981/imgp5380.th.jpg) (http://img714.imageshack.us/i/imgp5380.jpg/)

For anyone not familiar with how these work, they use a fluidized bed principle to keep the material in the trap liquidized. As long as you keep the trap full of water, the material coming in from the top will settle the heavies in the trap and the lighter material will wash out the back. They work great in that they have a built in classifier and I can move about double as much material with a trap sluice like the Bazooka then my drop riffle sluices.  Also, its about impossible to lose gold, unless you displace the gold in the trap with something both heavier and smaller (which is hard to do).

There's downsides to one of these though. They require more water then a normal sluice or a drop riffle and in fact, the more water you give them the better they run. Also they generate massive amounts of tailings which have to be shoveled from behind the sluice or the trap will not work right.
Title: Re: Built my own drop trap sluice
Post by: goldmann on January 31, 2011, 01:01:39 PM
I am curious, how are they at catching fine and flour gold??

Thank you.
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on January 31, 2011, 01:41:35 PM
They do not lose gold unless you somehow manage to displace the gold in the trap with something both smaller, and heavier then the gold. Which is about impossible for most areas you would sluice at. Or I guess its possible to lose gold if you ran it at an extreme angle, like straight up in the air, but that's about the only way I could see it losing gold.  

The trap on the Bazooka is 9 inches wide by 5 inches long, by 3 inches high.

Even if you ran this thing all week long, the gold would just settle deeper into the fluidized bed. I routinely screen the tailings on the Bazooka and have not yet found any color behind it. 
Title: Re: Built my own drop trap sluice
Post by: Toppossum on January 31, 2011, 02:58:31 PM
This video gives you a very good demonstration of how the Bazooka gold trap works.


    YouTube
        - Looking for Gold - Episode 6 - Bazooka Gold Trap Sluice - Part 1
   (http://www.youtube.com/watch?v=IlKmPslbKe4)

I might build a small one similar to the one in the video for roadside testing.  It doesn't seem require a lot of water a should be easy to set up on a recirculating system with a bilge pump.
Title: Re: Built my own drop trap sluice
Post by: Vagadero on February 01, 2011, 04:53:50 PM
Topic:"Fluid bed hand sluices are back..." (http://49ermike.com/dc/dcboard.php?az=show_topic&forum=181&topic_id=83765)
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 03, 2011, 11:50:47 AM
Mines mostly done, just waiting for the waterproofing to dry so I can test it out.

(http://img4.imageshack.us/img4/6527/imgp5426f.jpg) (http://img4.imageshack.us/i/imgp5426f.jpg/)

Title: Re: Built my own drop trap sluice
Post by: Vagadero on February 03, 2011, 02:09:32 PM
Can you post a front and a side view, if it's finished picture please?
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 03, 2011, 03:51:51 PM
Here's some improvements I made over the Bazooka.

My version has a pre-screen in the front to block leaves from clogging up both the pipes, and the grizzly which is super annoying every time you walk in front of the sluice you kick up leaves or other debris. And on the bazooka you have to bend down constantly and pull them out. No more for mine. This pre-screen is easily removable at the creek in case you need to clean it out. I used some 4 mesh. I could and might go smaller if needed. This is the front view.  

(http://img189.imageshack.us/img189/5959/imgp5488u.th.jpg) (http://img189.imageshack.us/i/imgp5488u.jpg/)

My version is also 8 inch's tall versus the bazookas 6 inch. Some of that is due to the larger wood base, but only 1/2 inch of that.

My version also has a 1 and 1/2 inch gap from the grizzly bottom to the top,  versus the bazookas 1 inch gap. This lets more water in the top to help push the gravel into the trap. And that extra water flow will help clean out the trap since the trap acts like the base of a waterfall.  

The grizzly on the bazooka is a mere 3 inches long, whereas the grizzly on mine, is 5 inches long. This extra length ensures the gravel is classified properly into the trap.

(http://img225.imageshack.us/img225/7041/imgp5496m.th.jpg) (http://img225.imageshack.us/i/imgp5496m.jpg/)

My version is also considerably narrower then the bazooka at the end, which should increase water velocity considerably to help push the oversize gravel out. The narrowest point on the bazooka is 9 and 1/4 inch, whereas mine tapers down to just 6 and 1/4 inches. Either will process a full shovel of bank run dirt, just mine will do it faster due to increased water velocity.

Mine cleans up into a 5 gallon bucket, same as the bazooka.

Either tomorrow, Saturday or Sunday I will try to get some testing in on this, depending on the weather.

Side view isn't much to look at, just looks like 2 4x4s stacked together. But if you want a pic I will try to get one up tomorrow.  

I tested a version of the screen already using both a 4 mesh classifier in front of my sluice and a screen on the bazooka and both worked great. Its a lot easier to reach down and move 20 leaves every couple minutes then constantly bending down to remove one or two every time you walk. And then when you come back with the shovelful of gravel more leaves are on the grizzly so you cant put that shovelful into the sluice because the leaves block the grizzly and let the material ride the current up and out. Remember I made these improvements into the sluice based on the testing I did with Indy's bazooka. Also the leaves on the screen actually helps the current build up around them since they form a restriction and a pool of water will form around the sluice. And around the bottom and top of the screen the current is increased. Then when you do remove the leaves all that extra water from the buildup surges into the sluice to help push the gravel out. Its a win win situation. And while the new leaves are building up, the water is building up too for the next time and the next big surge.  

The bazooka does not have this benefit as the buildup is inside and makes the traps not work. And the buildup of a couple leaves on the bazooka grizzly is not enough to increase the water buildup, thus there is no water surge when you free the couple leaves.

I am using both outdoor deck varnish, and thompson's water seal. I will also use some marine varnish when those dry. My standard water proofing way. My drop riffles still bead water using this method after a year of use.

I plan some other changes too, but I want to see how this prototype works before I go jumping into the next round of modifications. I forgot to add that mine should funnel water into the lower water pipes much better then the bazooka does as well. Let me explain why.

On the bazooka the forward motion of the lower incoming water into the tubes is mostly wasted because that water hits a wall and bounces back. Then it has to turn a steep corner to go into the Bazookas water tube. And all of the momentum it had coming forward is lost.

See this pic:

(http://img404.imageshack.us/img404/7449/imgp5377.th.jpg) (http://img404.imageshack.us/i/imgp5377.jpg/)

 On the bazooka for some awful reason they have the tubes out an inch or so from the back of the wall. That is wasting the majority of the kinetic energy of the incoming water. I have a hunch they did this to keep silt out of the pipes, but I still dont think thats a good design.  

Now look at mine. And imagine a great roaring jet of mountain river water coming down both these designs, which do you think it would rather go down?

(http://img835.imageshack.us/img835/7411/imgp5376.th.jpg) (http://img835.imageshack.us/i/imgp5376.jpg/)

Kinetic energy of the incoming water will hit that same wall but the capture area is not stuck out and redirecting the energy backwards.My tubes are flush with the wall, if a little recessed even. And also on mine the tubes are larger and will direct more water into the pipes with its kinetic energy intact.  I still want to put in some flow directors as well, to further help the water funnel into the tubes. Kind of like an intake manifold on a car. But that might not even be needed, we will see what testing shows.  
 
Now its true I might get some free floating silt debris in there, but I don't think its much to worry about. And the bazooka gets silt debris in there also.

I haven't weighed it yet, but it is definitely heavier then the plastic bazooka. Its comparable in weight to my 5 foot long wooden sluice with Hungarian riffles. I think it is about 12-20 pounds in weight but not sure. I will weigh it tomorrow to get the exact weight.  

As to how to carry it, I actually hadn't thought about that. So I guess I dont have all the angles covered. I have a spare adjustable military belt I can use as a strap. Or I might put a handle on it, I bought a couple of them for use with my drop riffle sluices. I have a hunch this thing is just a tad too heavy to rest comfortably on a strap, especially when wearing a backpack.
Title: Re: Built my own drop trap sluice
Post by: muconium on February 14, 2011, 06:43:36 PM
Just a thought off the top of my head:

Is there, or should there be, an ideal balance between the water pressure of the intake pipes (located in the trap) and the water pressure of the trap-inlet under the grizzly? In other words, could running a drop trap with too little water running down the slick plate and into the grizzly/trap-inlet cause material to be flushed from beneath and out the trap outlet?

Please be patient with me: I'm trying to understand how these work so I can build one.

It seems to me that the trap-inlet should be gapped larger than the trap-outlet...........
Title: Re: Built my own drop trap sluice
Post by: yicke on February 15, 2011, 07:34:34 AM
This is also a question I have thought of. If you look at the patent for the Schmidt Black Magic Sluice it is designed differently than the Bazooka. I think astrobouncer is the only one to answer that question as it will be a couple more months before I will be trying any of my designs.
free patent Schmidt sluice (http://www.freepatentsonline.com/5476177.pdf)
Title: Re: Built my own drop trap sluice
Post by: muconium on February 15, 2011, 03:36:02 PM
I didn't have to work today, so I've been mulling this over all day.

Of course you don't want two equal pressures coming together in the trap because they would cancel each other out.

BUT!

I wonder if it would be worth locating the trap outlet HIGHER than the trap inlet. Make them both the same size (1.5 inches, like Astrobouncer's), just make the material work a little harder and stay in the trap a little longer before exiting....

Hopefully, you guys are up to knocking ideas around on this thread.




Modifying my post:

I don't know if you guys saw the thread that Vagadero posted ( http://49ermike.com/dc/dcboard.php?az=show_topic&forum=181&topic_id=83765 ) but there is a lot of detail in it from another forum about the workings of fluid bed systems.

Some ideas I found interesting:

1. Situating the tubes at right angles to the material-flow.

2. Each tube having progressively smaller spray holes to ensure fine gold retention: widest holes are at the intake for added pressure to break up clay; finest holes located at the outlet so fine gold doesn't get blown out.

3. Putting compartments, or riffles, in the bottom of the trap to stop gold from migrating.

I'm not so sure about having a vast network of tubing in the trap to create the right angles. I think the extra plumbing would take up too much room in such a small trap............

Anyways, those are my thoughts for the day. I hope to begin soon on the general carcass of the box. I'm a substitute teacher, so I have the luxury of making my own schedule, so I want to start this project tomorrow...
Title: Re: Built my own drop trap sluice
Post by: muconium on February 20, 2011, 06:12:40 PM
Okay. Been working on my box project.

I decided to build one that has dimensions exactly in between Bazooka's "Prospector" model and their "Miner" model. The Miner is 48 inches long and the Prospector is 30 inches. So mine is 39 inches. I also kept all the same proportions as a Bazooka product, since I don't have any experience with a box like this. If I want to fiddle with anything like water-pressure in the trap later on, I will just make a new one.

Here are the rest of my specs, in case anyone can use them:

39" long
Upstream flare width: 27"
Downstream width: 11.5"
3" high scoop

1/4" bar-grizzly just like Bazooka.

Top and bottom are 1/2" plywood, scoop walls are 3" x 3/4" red oak, as are the front and back wall of the trap.

I'm using 2" aluminum angle for the sides of the slick plate, to cut down on the weight of wood. I also want to use sheet metal for the slick plate. This will be epoxied down and screwed.

I want to leave the entry-gap width flexible. Astrobouncer changed his to 1.5" from Bazooka's 1", so it's a variable that I want to experiment with. I have a feeling that the flow of gravel and water into the trap from the top has to be in some kind of balance with the pressure coming from beneath from the tubes. So I want to leave the topflow gap adjustable.

I want to try out that spray-on truck-bed liner as a coating for the entire box, inside and out. Can anyone advise about this? It's supposed to stick to wood, but I have questions about its ability to stick to the epoxy I used on the seams.........

Ficke and Astro: what size did you guys drill for the spray-holes on your tubes? It looks like Ficke used a 1" tube and Astro used 1.5" PVC, but I'm in the dark about spray hole width.

Thanks in advance for any input you guys can give me! Photos are coming!
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 20, 2011, 07:25:13 PM
I used 1/8 inch holes on the bottom and sides. If I had it to do over again I would have done the front holes 1/8 and 1/16 on the backside where water exits the trap. I will probably change this anyway, as well as redoing it with the 3 smaller pipes instead of 2 medium sized ones, and turning the water pipes sideways to the water flow.  Also, I am putting a 'brush' on the inside of mine to help redirect the fines into the trap, and to try and settle out the fines which have a tendency to flow out of the trap with the slurry once you get some gravel in the trap, the large gravel (bigger then 1/4 of an inch) acts as a 'soft bedrock' through which the fines float over with too much flow. This problem can be cured by either slowing the flow of the water entering the top of the bazooka down, or classifying the gravel even smaller then the bazooka grizzly seems to help as well.

 

 
Title: Re: Built my own drop trap sluice
Post by: muconium on February 20, 2011, 09:54:17 PM
Thanks, Astrobouncer!

I haven't spaced my grizzly bars yet, so maybe I'll go smaller than 1/4". Maybe to 3/16 or 1/8". I know for sure that I could classify right down to window screen size and still not exclude any Michigan gold, but I like to dream of bigger gold..... I also like to look through the bigger heavies at the end of the day and keep the bigger garnets.

Thanks for the tip on the "brush" idea. I wonder if you could retrofit your current box with a higher exit slot and get the same effect? I, so far, am keeping my entry and exit gaps level and the same size, since that looks like the standard on the Bazooka. I'm just using Bazooka as a standard that I can deviate from, once I get some experience with it, just like you have.

I've been wondering about facing my spray-holes upwards, like the fluid bed system discussed on Vagadero's thread. Specifically, does this create a more "quicksand" -type surface to the bed to encourage heavies to drop, or would it just push color up and out of the trap. Another question I've had is whether a fluid-bed of black sand would actually help gold to settle, just like the layer of ball-bearings in a jig. If so, there wouldn't be much demand to stop and clean out the box every half hour.

These are all questions that have been circling my brain as I try to think through the design....
Title: Re: Built my own drop trap sluice
Post by: muconium on February 21, 2011, 06:06:55 PM
Guys, have you seen this?

http://49ermike.com/dc/dcboard.php?az=show_topic&forum=181&topic_id=83896&mesg_id=83896&listing_type=search

Lots more good fluid-bed stuff.

I just took the time to actually read the Schmidt patent. Not much new information, with the exception that he created a much more "closed" trap. in the sense that the entrance and exit for the trap located *over* the trap, rather than at the beginning and end of the trap. In other words, if the trap was a shoe box, the material enters through a slot toward the center of the lid and exits through a slot in the lid that is few inches back of the opposite wall. The Bazooka looks as if the shoebox has no lid. The patent says that these "overhangs" above the trap are "important to the operation of the device because when the fluid and material enter the first opening there is a tendency for the fluid and material to move directly to the second opening and immediately exit carrying some of the desirable material [gold] out of the container. The overhang causes the flow to strike the side and the overhang and curl back against the flange where it is directed downwardly toward the center of the container. This gives the heavier material a greater opportunity to fall to the bottom of the container."

Here is a pic:


 [ You are not allowed to view attachments ]

Notice that there is also are "flaps to help deflect material in and out of the trap... I think I could probably add this stuff to my box, since I'm not actually to the stage of mounting the piece of wood over my trap that supports the grizzly.

I'm kinda curious as to why the Bazooka company left these details out of their design.............
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 21, 2011, 06:12:33 PM

Guys, have you seen this?

http://49ermike.com/dc/dcboard.php?az=show_topic&forum=181&topic_id=83896&mesg_id=83896&listing_type=search

Lots more good fluid-bed stuff.

----Snip----
 The patent says that these "overhangs" above the trap are "important to the operation of the device because when the fluid and material enter the first opening there is a tendency for the fluid and material to move directly to the second opening and immediately exit carrying some of the desirable material [gold] out of the container. The overhang causes the flow to strike the side and the overhang and curl back against the flange where it is directed downwardly toward the center of the container. This gives the heavier material a greater opportunity to fall to the bottom of the container."

----------

Right, this is what my own testing shows. Fine gold entering the bazooka will be carried right out the back with the rest of the slurry if the current is too strong. Which is why I am going to be testing some brushes in there to force the material down and into the trap better, instead of just riding the current out. I might have to make some modifications to the trap beyond turning the water pipe sideways as well. Thanks for the info and I am glad to be able to talk with someone else that is interested in this design.     
Title: Re: Built my own drop trap sluice
Post by: muconium on February 21, 2011, 06:23:15 PM


 glad to be able to talk with someone else that is interested in this design.     
[/quote]

I've been pretty much obsessing over it since the weekend!! LOL. That thread also was pretty inspiring, plus the fact that there are three of us all working on our own projects at the same time.

The design solves SO MANY damn problems that I've had, too. Classifying is such a big time drain. It takes away way too much time from actualy digging...
Title: Re: Built my own drop trap sluice
Post by: muconium on February 21, 2011, 09:47:53 PM
Astrobouncer, what about something like this:

 [ You are not allowed to view attachments ]

Same as the Schmidt, but inserted under the flat deck that Bazooka has above their trap where the grizzly bars terminate. The "deck" could be lowered down a little to force water under the deck and create a steady, reliable flow of water past the trap-openings.........

Just a thought.  <-thinking-> <-thinking->
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 22, 2011, 05:09:19 PM
It looks interesting and might work better then how it does now. Needs some testing!
Title: Re: Built my own drop trap sluice
Post by: rgecy on February 22, 2011, 06:58:49 PM
I am very intrigued by this design.  I would like to incorporate it in to a power sluice design though that would allow a higher rate of material thru it.  I think I have the basic understanding of how to do it, but facing the delima of how to design it so it can be easily cleaned out.  I guess it would have to be detachable some how or have some type of drain plug to release the concentrates.

The ability to feed big shovel fulls into a hopper that classifies it down to 1/2" minus and then down the sluice into the fluid bed trap with 1/4" or 3/16" minus material.  Hmmmm!  Just sounds peachy to me.  Maybe even some riffles before it to catch any larger pickers!  I think I am starting to salivate!

Any thoughts?

Robert
Title: Re: Built my own drop trap sluice
Post by: Toppossum on February 23, 2011, 07:24:59 AM
I am also thinking of using a design with a removable trap and riffles to trap larger gold before it reaches the trap.  The riffles I'm thinking about would be a drop riffle design.  The material for the drop riffle would be plastic cutting board 3/4 inch thick and the riffles would be routered into the plastic board.   The board would not get water logged like wood, should last longer, and should weigh less than a wooden equivalent.  I think that this design would catch quite a bit of the gold before it reached the drop trap.  Any thoughts on this?
Title: Re: Built my own drop trap sluice
Post by: muconium on February 23, 2011, 03:13:17 PM
I am very intrigued by this design.  I would like to incorporate it in to a power sluice design though that would allow a higher rate of material thru it.  I think I have the basic understanding of how to do it, but facing the delima of how to design it so it can be easily cleaned out.  I guess it would have to be detachable some how or have some type of drain plug to release the concentrates.

The ability to feed big shovel fulls into a hopper that classifies it down to 1/2" minus and then down the sluice into the fluid bed trap with 1/4" or 3/16" minus material.  Hmmmm!  Just sounds peachy to me.  Maybe even some riffles before it to catch any larger pickers!  I think I am starting to salivate!

Any thoughts?

Robert

Robert, this link might help you.

http://49ermike.com/dc/dcboard.php?az=show_topic&forum=181&topic_id=83765

The thread starts out talking about Bazooka Gold Company sluices, but eventually shifts to talk about fluid-beds in general. If you scroll down until you see some pics, there is one of a fluid-bed made out of some PVC and a kitty-liiter box that the maker used in-line with his high-banker. I didn't read it all (I'm more concerened with making a replica of a Bazooka sluice, which is a modification of the Schmidt Black Magic sluice) so I don't want to repeat what he said about his method cuz I might mislead you. But, you can just let your tailings from the high-banker drop into the kitty litter box, after they've been classified down to less than 1/4". The fluid-bed runs on a separate pump, or a by running a line from your high-banker pump. It seems pretty easy....
Title: Re: Built my own drop trap sluice
Post by: muconium on February 23, 2011, 03:18:33 PM
I am also thinking of using a design with a removable trap and riffles to trap larger gold before it reaches the trap.  The riffles I'm thinking about would be a drop riffle design.  The material for the drop riffle would be plastic cutting board 3/4 inch thick and the riffles would be routered into the plastic board.   The board would not get water logged like wood, should last longer, and should weigh less than a wooden equivalent.  I think that this design would catch quite a bit of the gold before it reached the drop trap.  Any thoughts on this?

Astrobouncer makes his own drop-riffle sluices. He uses wood and coats them with truck-bed-liner paint, which is something I'm about to try on my wood drop-trap sluice.....
Title: Re: Built my own drop trap sluice
Post by: muconium on February 23, 2011, 03:57:33 PM
I am also thinking of using a design with a removable trap and riffles to trap larger gold before it reaches the trap.  The riffles I'm thinking about would be a drop riffle design.  The material for the drop riffle would be plastic cutting board 3/4 inch thick and the riffles would be routered into the plastic board.   The board would not get water logged like wood, should last longer, and should weigh less than a wooden equivalent.  I think that this design would catch quite a bit of the gold before it reached the drop trap.  Any thoughts on this?

Toppossum, I also want to test my drop-trap, once it's done, by running the tailings into my LeTrap. Which is backwards of your plan......... lol.
Title: Re: Built my own drop trap sluice
Post by: Toppossum on February 24, 2011, 09:13:31 AM

Toppossum, I also want to test my drop-trap, once it's done, by running the tailings into my LeTrap. Which is backwards of your plan......... lol.


muconium, whatever works I'll giv'er a try.  Experimentation is half the fun of this hobby.  The idea of the drop riffles at the top was to catch small nuggets and gold.  That way I would have some visual clues to the gold being there without having to clean the trap to check.  Of course I could just buy a Gold Spear and then just poke it into the trap every once in a while to check if gold is present, but that wouldn't be as much fun.  ;)
Title: Re: Built my own drop trap sluice
Post by: yicke on February 25, 2011, 10:10:04 AM
Hi I wanted to build another drop trap sluice. One that was a little smaller and would fit in my back pack. I have been reading all of the comments posted on this site and on the other forum and tried to incorporate some of these observations into my new design. I have always been concerned about the water being able to just flow through the top of the sluice so I put a piece across the top of the trap about 2/3 in. I also have been concerned about the water flow through the jets so I created a hydraulicing effect starting with a 1 in. conduit to a to a to a supply line. Next I turned the jet bars 90 degrees and finally I put a medium in the bottom of the trap. I was able to find some scraps of a plexy glass like material at the home restore and was able to make my sluice transparent giving me a good idea of what will be happening when I  try it out. That will be another 2 months I am thinking.

(http://gpex.ca/image-sharing/images/gear005.jpg)

(http://gpex.ca/image-sharing/images/gear006.jpg)

(http://gpex.ca/image-sharing/images/gear007.jpg)

(http://gpex.ca/image-sharing/images/gear010.jpg)

(http://gpex.ca/image-sharing/images/gear011.jpg)




Title: Re: Built my own drop trap sluice
Post by: muconium on February 25, 2011, 04:36:50 PM
 {cool^sign} <-good_> {-applause-}

THAT is a beautiful piece of work, Yicke!
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on February 25, 2011, 04:45:47 PM
I agree. And I like how you got the water pipes setup there. Ought to be a real improvement over the bazooka design. Thanks for sharing.  {-applause-}
Title: Re: Built my own drop trap sluice
Post by: yicke on February 26, 2011, 07:58:13 AM
I thank you guys for sharing, this has been a great post!
Title: Re: Built my own drop trap sluice
Post by: muconium on February 26, 2011, 05:46:20 PM
Here are some pics of the baffles for my box. I'm trying to copy the schmidt patent for this part.....

 [ You are not allowed to view attachments ]

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Title: Re: Built my own drop trap sluice
Post by: rgecy on February 28, 2011, 07:54:14 AM
muconium,

Just an observation, but it looks like the inlet and outlet are very close as compared to the Schmidt design?  Would this give the gold enough time to settle?

Robert
Title: Re: Built my own drop trap sluice
Post by: muconium on February 28, 2011, 07:14:08 PM
muconium,

Just an observation, but it looks like the inlet and outlet are very close as compared to the Schmidt design?  Would this give the gold enough time to settle?

Robert

LOL. I've already taken the baffles off and am going to go back to the "open trap" type, but with a lid covering the lower outlet half of the trap. I want to try out the simple approach first before I start adding baffles. What I'm missing is some practical experience on a river........  they're still all frozen!   

I want to cover the lower half of the trap and see if that prevents heavies from being flushed.

I have a hard time keeping things simple!
Title: Re: Built my own drop trap sluice
Post by: rgecy on March 01, 2011, 12:39:59 AM
Does anyone know the measurement on the depth of the trap on the Bazooka "Miner"?  I am building the highbanker/power sluice this week and want to try and get as close to the specs as possible on the trap design.

Robert
Title: Re: Built my own drop trap sluice
Post by: johanssonsan on March 01, 2011, 01:14:06 AM
I hope you can get enough information from this patent:

Sluice trap (http://www.freepatentsonline.com/5476177.pdf)

Please show some pictures when you are ready.
Title: Re: Built my own drop trap sluice
Post by: rgecy on March 01, 2011, 01:36:42 AM
Thanks, I have seen the Schmidt patent info, no dimensions.  Just wanted to see if anyone has the Bazooka Gold Trap "Miner" and could give me some measurements on the trap depth. 

Thanks,

Robert
Title: Re: Built my own drop trap sluice
Post by: Toppossum on March 01, 2011, 11:30:45 AM
You can use the Schmidt design to build your sluice.  Just print out a copy of the diagram and then measure the diagram dimensions.  From those measurements you can scale up to any size sluice you want.  I find it easier to do this as I can then build the sluice using the materials I have on hand, the pump I will be using, and the material I expect to move through the sluice. 
Title: Re: Built my own drop trap sluice
Post by: muconium on March 01, 2011, 01:51:35 PM
Robert, I came up with the following when I was in the planning stage:

Prospector:
30" x 6" x 13" tapering to 9"
Trap: 5" long x 3" deep x 9" at the end of the sluice.
Grizzly-Gap Height: 1"
Grizzly Length: 3"
Taper 1.6" per foot

Miner:
48" x 6.5" x 21" tapering to 14.4"
Trap: 8" long x 3.25 " deep x 14.4" at the end of the sluice.
Grizzly-Gap Height: 1" ?
Grizzly Length: 3" ?
Taper 1.65" per foot


I made a guess about the Miner's dimensions based on the fact that Astrobouncer reported that the Prospector's trap is 5" long. I used the equation, 5 inches is to 30 inches (Prospector's overall length) just as X inches is to the length of the Miner, which is 48 inches. The equation I used is: 5/30 = X/48. I came up with 8 inches. The Miner is 6.5 inches high, so I have to assume that the trap is 3.25 inches deep.

It would be nice if someone had one to measure, but the company seems to be on the skids, since they don't answer their email or phone calls.

I hope this helps!
Title: Re: Built my own drop trap sluice
Post by: muconium on March 01, 2011, 02:13:18 PM
Hey guys,

Just in case anybody needs it, I have some pics of the Schmidt product. Someone was selling one online and took these pics, so I doubt that this is copyrighted material.

The pics weren't downloadable from the site where I found them, so I had to take screenshots....

 [ You are not allowed to view attachments ]

 [ You are not allowed to view attachments ]

 [ You are not allowed to view attachments ]
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on March 02, 2011, 05:31:52 AM
Guys check out my buddy Indy's video, this is the guy who's letting me borrow his Bazooka so I could test it out and build mine. Him and his buddy Nugget made a highbanker out of the schmidt and also they have a schmidt dredge they show here.   


    YouTube
        - Bazooka Type Highbanker / Dredge
   (http://www.youtube.com/watch?v=3AIOV_q03ZE)

Title: Re: Built my own drop trap sluice
Post by: Toppossum on March 02, 2011, 11:30:30 AM
Thanks for the video.  Every time I see one of these sluices operating I want to try one for myself.  The ease of operation and no classifying are a big pluses. 
Title: Re: Built my own drop trap sluice
Post by: muconium on March 02, 2011, 02:12:14 PM
Glad to see one of those in action. I wonder if it really has the baffles in there or is the trap open, like the Bazooka?
Title: Re: Built my own drop trap sluice
Post by: muconium on March 02, 2011, 08:00:52 PM
Imagine this:

A piece of flat material that is exactly the shape of the intake opening of a Bazooka sluice and it would fit just inside it.

Now imagine that this piece of flat material is mounted to the outside walls of the sluice intake by a horizontal axle.

Now screw a small lead weight on the bottom edge of your flat material.

Now imagine water running through the sluice and the piece of material starting to rotate like a waterwheel, which would make the water pressure halt for a slit-second on each rotation.

Wouldn't this be a water-driven jig?

 <-thinking-> <-thinking-> <-thinking->
Title: Re: Built my own drop trap sluice
Post by: rgecy on March 13, 2011, 11:10:08 PM
Well, you guys inspired me to get started on my Power Sluice/Highbanker.  I decided to put a fluid bed gold trap at the end of the sluice.  The first section will be 4' long with 18" of slick plate, then 30" of reverse angle riffles.  Then a 3' section with 2' of slick plate and then the fluid bed at the end.  Flud bed dimension will be 4" tall by 16" wide by 10" deep.

The images below are the start of the manifold going into the 4" deep fluid bed.  I put a pressure gauge on it so I can keep an eye on the pressure in the bed. Haven't drilled the holes yet.

Hope to have it all together this week and heading up to NC next weekend.

RGecy
Title: Re: Built my own drop trap sluice
Post by: muconium on March 17, 2011, 09:16:34 PM
Putting the finishing touches on my Bazooka replica. Gotta say, I'm proud of myself for not spending the 300+ dollars... Just putting the sheet metal slick plate on and a few more coats of truck-bed liner paint and it's off to the cold cold water!

Thanks, Astrobouncer, for the specs and advice from your field-testing and experience.

Thanks Yicke, for starting this thread!

RGecy, somehow I missed your topic reply on your new equipment. Looking good!
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on March 18, 2011, 06:18:03 AM
I finally have some free time coming up with Spring break so my prototype is hitting the water this weekend. Will get pics and videos, and also I will have another sluice behind it to check tailings.
Title: Re: Built my own drop trap sluice
Post by: goldmann on March 19, 2011, 04:38:47 PM
drop trap sluice  drop trap sluice (http://gpex.ca/smf/index.php?topic=5339.0)


Bazooka Gold Trap Sluice (a fluid bed, how it works, an inside look)

Looking for Gold - Episode 6 - Bazooka Gold Trap Sluice - Part 1

    YouTube
        - Looking for Gold - Episode 6 - Bazooka Gold Trap Sluice - Part 1
   (http://www.youtube.com/watch?v=IlKmPslbKe4&playnext=1&list=PLF2B4BE6ABD01F3F4)
 
Looking for Gold - Episode 6 - Bazooka Gold Trap Sluice - Part 2

    YouTube
        - Looking for Gold - Episode 6 - Bazooka Gold Trap Sluice - Part 2
   (http://www.youtube.com/watch?v=l5qdo5S9YWM&feature=mfu_in_order&list=UL)

I wrote Todd at Bazooka Gold Trap Sluice and he told me that his sluices(Mini, Prospector, and Miner) CAN be made into a highbanker but he did not elaborate and explain how to do this or how it can be done?

1)  Does anyone know how the Bazooka Gold Trap Sluice is at catching fine gold?? Good to catching down what mesh size of gold?? Will it catch 100, 50, or only +20 mesh sized gold??
Title: Re: Built my own drop trap sluice
Post by: muconium on March 19, 2011, 07:45:17 PM
drop trap sluice  drop trap sluice (http://gpex.ca/smf/index.php?topic=5339.0)

I wrote Todd at Bazooka Gold Trap Sluice and he told me that his sluices(Mini, Prospector, and Miner) CAN be made into a highbanker but he did not elaborate and explain how to do this or how it can be done?

1)  Does anyone know how the Bazooka Gold Trap Sluice is at catching fine gold?? Good to catching down what mesh size of gold?? Will it catch 100, 50, or only +20 mesh sized gold??

Here is a drop trap sluice set up as a highbanker, thanks to Indy and Nugget:

    YouTube
        - Bazooka Type Highbanker / Dredge
   (http://www.youtube.com/watch?v=3AIOV_q03ZE)

It's strange that you got a response from "Todd." I wrote and called him to make sure they were still in business. I got no response and went on to make my own "Bazooka."

Title: Re: Built my own drop trap sluice
Post by: rgecy on March 19, 2011, 11:45:14 PM
Starting to assemble the pieces on my Power Sluice with Gold Trap!  Didn't get enought time to get it finished this week, but should be done by Tuesday/Wed and headed up to NC.

Robert
Title: Re: Built my own drop trap sluice
Post by: Toppossum on March 20, 2011, 06:29:39 AM
Excellent fabrication work.  Very impressive it looks professionally done. 
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on March 20, 2011, 08:06:43 AM
Quote
1)  Does anyone know how the Bazooka Gold Trap Sluice is at catching fine gold?? Good to catching down what mesh size of gold?? Will it catch 100, 50, or only +20 mesh sized gold??

It will catch 100 mesh and smaller all day long. I use 4 mesh screens most of the time and still catch tons of fines (-60 and smaller). If all I had was fine gold I would go smaller with mesh size to perhaps 20, but sometimes I find some decent coarse stuff so I like to stick with the 4 mesh.

Heres some of my recent cleanups with it.

(http://img121.imageshack.us/img121/747/imgp5718o.th.jpg) (http://img121.imageshack.us/i/imgp5718o.jpg/)

(http://img151.imageshack.us/img151/5760/march182011229.th.jpg) (http://img151.imageshack.us/i/march182011229.jpg/)

(http://img819.imageshack.us/img819/4691/june272010056.th.jpg) (http://img819.imageshack.us/i/june272010056.jpg/)

(http://img713.imageshack.us/img713/5930/imgp6054.th.jpg) (http://img713.imageshack.us/i/imgp6054.jpg/)

Title: Re: Built my own drop trap sluice
Post by: muconium on March 20, 2011, 03:28:05 PM
Robert, that looks good enough to eat from. Seriously, you should go into production with your work... You might find lots of customers on the forum.

 ;D
Title: Re: Built my own drop trap sluice
Post by: rgecy on March 20, 2011, 05:21:08 PM
Robert, that looks good enough to eat from. Seriously, you should go into production with your work... You might find lots of customers on the forum.

 ;D

Thanks for the compliment!  Not sure about production, its been a lot of hard work!  Believe it or not, I had never used a sheet metal brake till now.  Although, I learned a lot from this one and probably could fab it a lot faster and make some imrovements on the next go around!

I am very detail oriented (probably too much) and spent a lot of time on the dimensions and engineering to figure out how to make this thing work.

I think the coolest part is the fold down door on the trap to get the cons out.  This thing cant be just tilted up into a 5 gallon bucket to clean out the cons.  So I had to figure a way to do it while it was still in place.  Thought about the drain plug like in the Schmidt patent, but it just seemed like the gold could still be trapped in the corner and hard to rinse out.  This way, it will all wash down into a a tub. 

Robert


Title: Re: Built my own drop trap sluice
Post by: muconium on March 20, 2011, 08:30:44 PM

I think the coolest part is the fold down door on the trap to get the cons out.  This thing cant be just tilted up into a 5 gallon bucket to clean out the cons.  So I had to figure a way to do it while it was still in place.  Thought about the drain plug like in the Schmidt patent, but it just seemed like the gold could still be trapped in the corner and hard to rinse out.  This way, it will all wash down into a a tub. 

Robert




One of my deciding factors for not putting in baffles was the problem of getting the cons out. I also lost sight of main goal: to make a replica of a Bazooka and see how it works. I plan to test it with a definite number of lead birdshot, which I can count at the beginning and end of the day...

I had a flash of insight about 2 hours ago when I was just looking at my work and figuring out what's left to do: The trap on a Bazooka has an entry and exit that are in line with the flow of water, and I think that makes everybody have doubts about their ability to keep gold in the trap without the current scouring it out. So, why not close off the downstream exit-slit and have the flow of water and tailing-slurry leave through the two sides of the trap?

The pipes that cause the fluid bed in my trap are NOT set at right angles to the flow of water (although I read that setting them at right angles helps in gold retention). One of the problems solved by a side-exit would be that the flow would, at least for a short distance, be forced to move at right angles to the pvc pipe.

I might try this if I make another one. Just thought I'd share the thought.
Title: Re: Built my own drop trap sluice
Post by: johanssonsan on March 22, 2011, 06:59:08 AM
Hello
Found these two on YouTube today. I am very impressed!   {-applause-} {-applause-} {-applause-}


    YouTube
        - The begining of my bazooka sluice box
   (http://www.youtube.com/watch?v=ZR32EFXBfUE&NR=1)


    YouTube
        - bazooka gold trap sluice
   (http://www.youtube.com/watch?v=f4KNAvmu-jU)
Title: Re: Built my own drop trap sluice
Post by: rgecy on March 22, 2011, 10:01:12 PM
WOW! THAT KID IS LIKE....WHAT 12 YEARS OLD!  DID YOU SEE THE SLUICE BOX HE MADE ALSO?

HE SEEMS PRETTY SERIOUS ABOUT GOLD PROSPECTING.

Robert


    YouTube
        - gold panning kit
   (http://www.youtube.com/watch?feature=player_profilepage&v=pkYSopLsliU)
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on March 30, 2011, 05:32:30 PM
Tested my wooden gold trap version today.  You can read more about the different features of mine (compared to the bazooka) on the original post I did about it, way back in the thread.

Ok so I carried it all the way down to a stream to test today. It felt like a long walk in carrying that thing! Mine is much heavier then the bazooka and it was noticeable by the time I got to the stream, took about 15 minutes to hike there from the road.

Anyway, I picked a spot that I have worked before and always found fines there. No bedrock or false bedrock to skew results, just a gravel bar that washes down and comes back after every good rain, like we have had lately.

I used one of my pans behind it and tested the tailings. Some fine gold was getting out. In 8 pans, I had 4-5 pieces of 60 to sub 100 mesh gold in one pan, and a couple pans had 2 small 80 mesh or below.  2 of the pans had no gold visible. And 3 of them had 1-3 small 100 mesh, with one of those also having a thin about 40 mesh piece in there. So I was losing some small gold, but I think it was partly my fault. On my design, there's no kind of break inside to slow down the slurry. I am going to add some carpeting, fabric, or plastic, that will look kind of like the brushes you see hanging down in a carwash. Also I was running a little bit extra drop to help push the gravel off faster. It worked, but I think it was just too much drop for the fine gold.  I still captured a lot of fines, as you will see from the cleanup, but recovery could be better.  

Another thing I messed up on was I made the back top piece too high and it wouldnt fit in the bucket until I took that last top support bracket off. I will redesign that bracket somewhere else.  Luckily I had brought a screwdriver so I was able to remove it and get it in the bucket to cleanup.

On the plus side, the narrow width of mine helped push the oversize up and out much better then the bazooka does. The leaf blockers worked great and I had no plugups on the grizzly from leafs or other debris. The 4 mesh screen was almost perfect size, if still a bit big, but It kept the gravel I did get to a minimum, as when I screened it all down to 8 mesh, I only had about 20 1/4 mesh in there, and most of that was hematite with a couple garnets.  

Here it is setup.

(http://img847.imageshack.us/img847/6531/march302011003.jpg) (http://img847.imageshack.us/i/march302011003.jpg/)

With some rocks in it, notice all the small ones are already gone.

(http://img13.imageshack.us/img13/643/march302011007.jpg) (http://img13.imageshack.us/i/march302011007.jpg/)


(http://img862.imageshack.us/img862/6582/march302011002.jpg) (http://img862.imageshack.us/i/march302011002.jpg/)


You can see where I had to take the top support bracket off to fit it in the bucket. Duh!
(http://img36.imageshack.us/img36/3127/march302011015.jpg) (http://img36.imageshack.us/i/march302011015.jpg/)

(http://img40.imageshack.us/img40/7302/march302011013.jpg) (http://img40.imageshack.us/i/march302011013.jpg/)

(http://img692.imageshack.us/img692/6489/march302011012.jpg)
 (http://img692.imageshack.us/i/march302011012.jpg/)

I didnt get to stay long to test it like I wanted, only about two hours total which was barely enough time, but I managed to dig a decent hole and sample pan the tailings after every 5-6 shovels full. Had to take the puppies to the vet. Hopefully this weekend I can get some more testing time in. All in all, I am pleased with how it did. It captured a really good amount of gold for the spot, even more then the bazookas cleanup from almost the exact same spot.

Cleanup:

(http://img43.imageshack.us/img43/3954/march302011025.jpg) (http://img43.imageshack.us/i/march302011025.jpg/)

To do list:

Fabricate something to slow down the water going through the trap better and also to break surface tension. A hanging brush would work good for this I think.

Also have to fix the back support bracket to fit inside the bucket. I might just add another side support since it seems sturdy enough.

I have a video of it in action but that will have to wait as I have some online work to do for college tonight.
Title: Re: Built my own drop trap sluice
Post by: juu907 on March 30, 2011, 06:13:58 PM
 <-good_>  looking real good there astro and tweeking is a good part of the experience. i have heard several times that if you can come up with a nice fine nylon brush wide enough it will work the best for knocking down the fines. little spendy though.   have fun.   jerry
Title: Re: Built my own drop trap sluice
Post by: matscards on March 31, 2011, 01:23:58 PM
i have never built a drop trap sluice.but i really like seeing diffrent applications of fluidized beds.what would you think of two traps in series in the same sluice?say one with spray bars perpendicular to sluice next one parallel.two water inlets first one as normal second one(s)outside with pipes running alongside the sluice and entering the second trap with a 90degree fitting.i'll see if i can draw up a print and post.give me your thoughts and impressions.
Title: Re: Built my own drop trap sluice
Post by: RemingtonMagnum on April 25, 2011, 04:40:57 PM
Hi Folks

Please try to follow what I am trying to add. Many times I fail to express myself clearly.

Remember the trap box. 1- it has an inlet for the hopevull gold to enter. 2- Why not make an exit hole back on the sluice board run way with just water if all is correct... Would it not be prudent to utilize the sluice excess by  placing standrd Moss, Expanded metal, Rifles etc on that section. The cost will be nominal , just a few dollars. After all you do purchase auto insurance. You may have to direct the existing water in the normal direction.

Just an observation from some one who has been banging my head about this project for a long time. I still have to many reservations to it's value.

Don Jackson Remington Magnum/Ultramag
Title: Re: Built my own drop trap sluice
Post by: sulcata99 on April 26, 2011, 04:32:13 PM
Read this thread last night and had an idea that might help in getting small gold. Not really my idea, I got it from the cutaway drawing of the Gold Cube.   Gold Cube - Gold Cube  (http://goldcube.net/#/how-it-works/4545153185) . I dont have the materials to test this theory currently so I hope one of you can build and test it and post back here. [ You are not allowed to view attachments ]
Just a quick drawing in MS Paint.
Title: Re: Built my own drop trap sluice
Post by: muconium on April 26, 2011, 06:23:35 PM
Okay, I've been avoiding reporting back on how my home-built drop-trap worked out.

Overall, it works "okay." Drawback #1 is the same as Astro's: HEAVY. I want to use it in some pretty remote places this summer, but mine has to weigh around 40 lbs... That's not TOO big to carry around, but it is when you want to take some extra gear on your back. I put in a slick-plate of sheet-metal, plus all the damn epoxy and 1/2 inch plywood and it all equals out to "pretty heavy." Alone, that's not such a problem, but, here comes problem number two:

Not enough pressure coming through the pipes to process material. That's fixable: I can just drill some more holes. A related problem is that I can't throw dirt through it as quickly as I would like. Both are related to the fact that I just threw it down between 2 boulders. I didn't build a small dam or diversion to build pressure.

All my problems are tolerable or fixable with tweaking. But, I'm still friends with my Le Trap sluice. Not throwing it away just yet.  ;)
Title: Re: Built my own drop trap sluice
Post by: sulcata99 on May 12, 2011, 06:05:59 AM
I ended up finding some material to build a 16 inch one late last week, 1/8" plexiglass scrap from a cnc replacement window and 3/4" plywood rescued from my neighbors bonfire.
Ran it a couple times so far this week. Cant get enough water through it to wash all the gravel out of it in the creek I was testing at, its small and spring fed, but did get good results with it. The bed stayed very fluid almost to wall that holds the pipes.
This being Ohio I have to go buy how much black sand it collects to tell how its doing. I had about as much sand as I thought I should after running 6 pans of material through it the first day. The second day I set a small sluice I made up at its discharge and after running 8 pans through it I had about half the sand I normally find from panning out one pan in the sluice.
Over all not bad but not perfect. I will continue to use this setup as I liked not having to classify and I had fun!
Didnt put the 3/4 cut pipe on this one as I wanted a base to test first plan on either building another one or modding this one to see if it will help keep fines in the trap or even work, been thinking back pressure might cause it to back flow or at least stop flow.
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Title: Re: Built my own drop trap sluice
Post by: RemingtonMagnum on May 12, 2011, 08:39:42 AM
I finally have some free time coming up with Spring break so my prototype is hitting the water this weekend. Will get pics and videos, and also I will have another sluice behind it to check tailings.

Hi Folks

Now, I like the way your thing. No need to take a chance of loosing gold.

Don Jackson Remington Magnum/Ultramag
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on July 23, 2011, 07:21:32 PM
Btw nice drop trap fabrication, I like it, and I really like the sluice behind it. The only thing is I would make the gap less high as it lets the oversize gravel slide out easier but maybe it just looks high from the picture.  I havent had enough water flow to run either drop trap of at all lately on these little creeks that are all about dry now.

I will borrow my cousins Micrometer tomorrow and measure it, if hes home. I think its probably 1/8 inch or so though.
Title: Re: Built my own drop trap sluice
Post by: sulcata99 on July 23, 2011, 09:06:56 PM
Btw nice drop trap fabrication, I like it, and I really like the sluice behind it. The only thing is I would make the gap less high as it lets the oversize gravel slide out easier but maybe it just looks high from the picture.  I havent had enough water flow to run either drop trap of at all lately on these little creeks that are all about dry now.

Thanks astrobouncer! The back is a bit to high and the next one will have a slightly different design, for now I have been classifying down to 20 mesh first, I also added some more holes in the tubes as the I was having problems with clogging and the bed would not stay fluid.
Hope your creaks get flowing again soon!
Title: Re: Built my own drop trap sluice
Post by: astrobouncer on July 24, 2011, 02:26:04 PM
I couldnt get the micrometer, but its an 1/8 of an inch thick on the sides and very bottom, and 1/4 of an inch thick where you shovel the gravel onto. And the top part of the grizzly is also 1/4 of an inch thick. 
Title: Re: Built my own drop trap sluice
Post by: Vagadero on July 24, 2011, 02:32:56 PM
Thank you!!!
Title: Re: Built my own drop trap sluice
Post by: theshooter on August 14, 2011, 01:36:28 PM
In case anyone is interested, the patent for the Schmidt trap is here. You can also download it in PDF.

Sluice trap - Google Patents (http://bit.ly/o7KSwI)

And, you can search all pattents via Google too - Google Patents (http://www.google.com/patents)
Title: Re: Built my own drop trap sluice
Post by: mwirth on October 02, 2011, 09:55:13 PM
I have to ask myself, why don't people pre-classify the dirt, gravel, whatever with a simple grizzly before it gets onto the sluice. I'm in the process of building a suction dredge that uses a modified version, but the dredged material will go through a grizzly to be classified first. Why waste kinetic energy, water velocity and human energy moving rocks off of the sluice by hand in the first place. [ You are not allowed to view attachments ]
Title: Re: Built my own drop trap sluice
Post by: gandalfwhite on October 09, 2011, 01:47:54 PM

Right, this is what my own testing shows. Fine gold entering the bazooka will be carried right out the back with the rest of the slurry if the current is too strong. Which is why I am going to be testing some brushes in there to force the material down and into the trap better, instead of just riding the current out. I might have to make some modifications to the trap beyond turning the water pipe sideways as well. Thanks for the info and I am glad to be able to talk with someone else that is interested in this design.     

I have a little brainstorm.. How do you think the fine gold would act if it enters a second trap after the first one?
What I mean is classifying to 1/4 first, and on the secondary stage classify to 1/16 or smaller?
This is just wild thinking from my side, but would it add much to a construction in weight and cons? (if needed the secondary could be smaller in size? or are two different bazookas to prefer in that case
//gandalfwhite
Title: Re: Built my own drop trap sluice
Post by: ruthless79 on December 03, 2011, 06:46:31 AM
I am new to prospecting and have been doing a lot of research on sluices and came across this thread which is why I signed up on this site. I just wanted to thank every one that contributed to this thread. I started building my my drop trap sluice last night and should have it finished in a few days I will post some pictures to further assist anyone else looking to make one in the future.
Title: Re: Built my own drop trap sluice
Post by: heartlander27 on December 04, 2011, 04:00:24 PM
I have to ask myself, why don't people pre-classify the dirt, gravel, whatever with a simple grizzly before it gets onto the sluice. I'm in the process of building a suction dredge that uses a modified version, but the dredged material will go through a grizzly to be classified first. Why waste kinetic energy, water velocity and human energy moving rocks off of the sluice by hand in the first place.boat_02.jpg

I stay away from in-stream sluice grizzlys for a couple reasons. No control over material dumped , easily overloads sluice, doesn't wash material, gold sticks to unwashed  material so it's lost before it ever goes through the sluice, wont screen down past 1/2", creates surging.
 But, I suppose it's better then not classifying at all?? Maybe.
Title: Re: Built my own drop trap sluice
Post by: NickR on February 20, 2012, 05:13:47 PM
I made this out of some beautiful maple I had laying around.  Its 27'' across top 9'' across bottom and 36'' long. It has 1 1/4 pipes with three 1/8'' and three 3/32'' holes in each pipe. all seams are glued with PL premium construction glue. sides are 6''. It has 1/4'' screen and works nicely no results as of now.
Title: Re: Built my own drop trap sluice
Post by: nu.b1 on February 26, 2012, 09:00:19 PM
Thanks for all the info here.   :D
Title: Re: Built my own drop trap sluice
Post by: mrcash2u on April 12, 2012, 08:08:11 PM
Built my own bazooka..couldn't afford the 240.00 dollars... after paying 195.00 for the box, plus shipping, plus tax...with this economy its just alittle too much sooooo i built one for 50.00 dollars. (http://i779.photobucket.com/albums/yy73/tistore/gold/IMAG0371.jpg)   <-good_>
Title: Re: Built my own drop trap sluice
Post by: rgecy on April 13, 2012, 09:01:17 PM
Well I finally got a chance to test my Fluid Bed Highbanker.  Here are some picts of it in operation.  We moved several yards of dirt no problem and it trapped even the very fine gold.  I did make a design modification and put a 1 inch diverter just behind the entrance to the fluid bed that would stop the water from flowing straight across the top of the bed and push the materials down in to it.  I think this helped trap some of the fines instead of allowing the high current flow to push them out the back.

Robert
 

(http://s8.postimage.org/qsqar3ufp/IMAG0083.jpg)
(http://s19.postimage.org/wkgeex8xf/IMAG0090.jpg)
(http://s19.postimage.org/wlqc8car7/IMAG0100.jpg)
(http://s19.postimage.org/gy1l86wz7/IMAG0115.jpg)
(http://s19.postimage.org/9w3nlztdf/IMAG0140.jpg)
Title: Re: Built my own drop trap sluice
Post by: Maddog419 on April 18, 2012, 11:47:08 PM
I hope you can get enough information from this patent:

Sluice trap (http://www.freepatentsonline.com/5476177.pdf)

Please show some pictures when you are ready.
1st thanks all for sharing your ideas,,,I like this design myself and might mess with it...But from what I see in some of your builds and the patent is one big major flaw...When you look close at 28/30 this is what makes this settup work...Sluice trap (http://www.freepatentsonline.com/5476177.pdf)
Gold being heavy flow close to the bottom num 28 creates a drop in pressure and the gold follows it...I would think in my mind that an airplane wing design would work better,,,meaning that from the grizzly to the drop num 28...
Num 30 in this settup is just to force the gold back down in the box and let the lighter stuff float out...I,m thinking of a cone settup also for the box part of 52a/52b---I would keep the sq part of the box for max water flow but run it to a cone design at the end...That way the tube num 14 would get more water pressure,,,JMO
It would only make sense on this settup to have some type of earth magnet to help remove some of the black sands,,,clay you can see on your rocks and black sand you'll see on your magnet...

This is always a big plus on knowing when to do clean-outs,,,if I was in the testing of this settup I would run an earth magnet at least on the clean out end to see how it is doing...

GL
Title: Re: Built my own drop trap sluice
Post by: Maddog419 on April 19, 2012, 12:02:58 AM
Tested my wooden gold trap version today.  You can read more about the different features of mine (compared to the bazooka) on the original post I did about it, way back in the thread.

Ok so I carried it all the way down to a stream to test today. It felt like a long walk in carrying that thing! Mine is much heavier then the bazooka and it was noticeable by the time I got to the stream, took about 15 minutes to hike there from the road.

Anyway, I picked a spot that I have worked before and always found fines there. No bedrock or false bedrock to skew results, just a gravel bar that washes down and comes back after every good rain, like we have had lately.

I used one of my pans behind it and tested the tailings. Some fine gold was getting out. In 8 pans, I had 4-5 pieces of 60 to sub 100 mesh gold in one pan, and a couple pans had 2 small 80 mesh or below.  2 of the pans had no gold visible. And 3 of them had 1-3 small 100 mesh, with one of those also having a thin about 40 mesh piece in there. So I was losing some small gold, but I think it was partly my fault. On my design, there's no kind of break inside to slow down the slurry. I am going to add some carpeting, fabric, or plastic, that will look kind of like the brushes you see hanging down in a carwash. Also I was running a little bit extra drop to help push the gravel off faster. It worked, but I think it was just too much drop for the fine gold.  I still captured a lot of fines, as you will see from the cleanup, but recovery could be better.  

Another thing I messed up on was I made the back top piece too high and it wouldnt fit in the bucket until I took that last top support bracket off. I will redesign that bracket somewhere else.  Luckily I had brought a screwdriver so I was able to remove it and get it in the bucket to cleanup.

On the plus side, the narrow width of mine helped push the oversize up and out much better then the bazooka does. The leaf blockers worked great and I had no plugups on the grizzly from leafs or other debris. The 4 mesh screen was almost perfect size, if still a bit big, but It kept the gravel I did get to a minimum, as when I screened it all down to 8 mesh, I only had about 20 1/4 mesh in there, and most of that was hematite with a couple garnets.  

Here it is setup.

(http://img847.imageshack.us/img847/6531/march302011003.jpg) (http://img847.imageshack.us/i/march302011003.jpg/)

With some rocks in it, notice all the small ones are already gone.

(http://img13.imageshack.us/img13/643/march302011007.jpg) (http://img13.imageshack.us/i/march302011007.jpg/)


(http://img862.imageshack.us/img862/6582/march302011002.jpg) (http://img862.imageshack.us/i/march302011002.jpg/)


You can see where I had to take the top support bracket off to fit it in the bucket. Duh!
(http://img36.imageshack.us/img36/3127/march302011015.jpg) (http://img36.imageshack.us/i/march302011015.jpg/)

(http://img40.imageshack.us/img40/7302/march302011013.jpg) (http://img40.imageshack.us/i/march302011013.jpg/)

(http://img692.imageshack.us/img692/6489/march302011012.jpg)
 (http://img692.imageshack.us/i/march302011012.jpg/)

I didnt get to stay long to test it like I wanted, only about two hours total which was barely enough time, but I managed to dig a decent hole and sample pan the tailings after every 5-6 shovels full. Had to take the puppies to the vet. Hopefully this weekend I can get some more testing time in. All in all, I am pleased with how it did. It captured a really good amount of gold for the spot, even more then the bazookas cleanup from almost the exact same spot.

Cleanup:

(http://img43.imageshack.us/img43/3954/march302011025.jpg) (http://img43.imageshack.us/i/march302011025.jpg/)

To do list:

Fabricate something to slow down the water going through the trap better and also to break surface tension. A hanging brush would work good for this I think.

Also have to fix the back support bracket to fit inside the bucket. I might just add another side support since it seems sturdy enough.

I have a video of it in action but that will have to wait as I have some online work to do for college tonight.

Nice pic's,,,they do make sq buckets tho...On breaking the surface tension---I've done it a few different ways but what I've found that works best and easy (cheap too)  use dawn dish washing soap...Just fill a old sponge up with it and put it in a old sock,,,somewhere in the water flow...Just sqezz it and you will know when to refill it,,,you can use bar soap cut-up if need be also.


GL
Title: Re: Built my own drop trap sluice
Post by: Maddog419 on April 19, 2012, 12:35:20 AM
Well I finally got a chance to test my Fluid Bed Highbanker.  Here are some picts of it in operation.  We moved several yards of dirt no problem and it trapped even the very fine gold.  I did make a design modification and put a 1 inch diverter just behind the entrance to the fluid bed that would stop the water from flowing straight across the top of the bed and push the materials down in to it.  I think this helped trap some of the fines instead of allowing the high current flow to push them out the back.

Robert
 

(http://s8.postimage.org/qsqar3ufp/IMAG0083.jpg)
(http://s19.postimage.org/wkgeex8xf/IMAG0090.jpg)
(http://s19.postimage.org/wlqc8car7/IMAG0100.jpg)
(http://s19.postimage.org/gy1l86wz7/IMAG0115.jpg)
(http://s19.postimage.org/9w3nlztdf/IMAG0140.jpg)

Nice--I like your helpers,,,get all the fam doing it...Just something that will help you out,,,I would build a 3 or 4 foot kicker out of the rear---that way the rocks do not build-up on the legs,,,saves alot of down time when cleaning the rocks away...I also use some 3/4" to 1" belting on the end of the grizzly,,,you can just wire loop it on if need be,,,what this does is make sure all the rocks are clean before the weight of them passes out the back side...I set everything for a one man working fource,,,I would have turn my high banker around the other way...Just easyier to kick the rocks downhill then uphill...

GL
Title: Re: Built my own drop trap sluice
Post by: Fleng on April 19, 2012, 01:37:07 PM
Not sure why you want to use untreated white pine. I think a coat of poly or varnish would stretch the lifetime of the sluice considerably. I can see not wanting to use treated wood as the poisen would leech out.
Title: Re: Built my own drop trap sluice
Post by: adangher on May 11, 2012, 10:06:53 AM
I have read a couple of the posts and convinced me to become part of the group. It has also inspired me to built my own trap. I have used it for roughly two months and am very pleased with the results. Justhave to figure out how to post pictures. I have been going out to the local river infresno ca. This river us part of an ancient river system and has a history of gold. The gold here is very fine. That is why for my grizzlyscreen I used quarter in drilled plate.
Title: Re: Built my own drop trap sluice
Post by: tiger4life on February 21, 2013, 08:52:59 AM
Here's my version of the gold trap sluice.

Its almost done, I just have to seal a couple seams on the back trap, and then add some more waterproofing.

I took pictures of it next to the bazooka to help show its dimensions.

My version is narrower then the Bazooka. I did this on purpose, when you have excessive width you are wasting energy that could be better spent moving overburden up and out of the sluice. Mine starts at 10 inches wide and tapers to 6 inches at the end. It continues tapering right up until the end because the narrower width should help push the oversize out of the sluice.

The first four pics is of the bottom section and the trap.

(http://img197.imageshack.us/img197/591/imgp5310a.th.jpg) (http://img197.imageshack.us/i/imgp5310a.jpg/)
(http://img89.imageshack.us/img89/1438/imgp5308k.th.jpg) (http://img89.imageshack.us/i/imgp5308k.jpg/)
(http://img89.imageshack.us/img89/3143/imgp5306.th.jpg) (http://img89.imageshack.us/i/imgp5306.jpg/)
(http://img404.imageshack.us/img404/8964/imgp5314u.th.jpg) (http://img404.imageshack.us/i/imgp5314u.jpg/)

Top part that tapers inward, plus the grizzly.  
(http://img517.imageshack.us/img517/8633/imgp5370.th.jpg) (http://img517.imageshack.us/i/imgp5370.jpg/)
(http://img517.imageshack.us/img517/5844/imgp5369.th.jpg) (http://img517.imageshack.us/i/imgp5369.jpg/)


Inside the bottom half of mine.
(http://img835.imageshack.us/img835/7411/imgp5376.th.jpg) (http://img835.imageshack.us/i/imgp5376.jpg/)

Bottom half of the bazooka.
(http://img404.imageshack.us/img404/7449/imgp5377.th.jpg) (http://img404.imageshack.us/i/imgp5377.jpg/)

And then side by side photos of mine next to the bazooka.
(http://img573.imageshack.us/img573/7915/imgp5375.th.jpg) (http://img573.imageshack.us/i/imgp5375.jpg/)
(http://img41.imageshack.us/img41/5526/imgp5382.th.jpg) (http://img41.imageshack.us/i/imgp5382.jpg/)

(http://img138.imageshack.us/img138/6140/imgp5378v.th.jpg) (http://img138.imageshack.us/i/imgp5378v.jpg/)

(http://img717.imageshack.us/img717/4623/imgp5381.th.jpg) (http://img717.imageshack.us/i/imgp5381.jpg/)
(http://img714.imageshack.us/img714/6981/imgp5380.th.jpg) (http://img714.imageshack.us/i/imgp5380.jpg/)

For anyone not familiar with how these work, they use a fluidized bed principle to keep the material in the trap liquidized. As long as you keep the trap full of water, the material coming in from the top will settle the heavies in the trap and the lighter material will wash out the back. They work great in that they have a built in classifier and I can move about double as much material with a trap sluice like the Bazooka then my drop riffle sluices.  Also, its about impossible to lose gold, unless you displace the gold in the trap with something both heavier and smaller (which is hard to do).

There's downsides to one of these though. They require more water then a normal sluice or a drop riffle and in fact, the more water you give them the better they run. Also they generate massive amounts of tailings which have to be shoveled from behind the sluice or the trap will not work right.
From the picture looking into the backside of the Bazooka seems to be made out of Aluminum very interesting did not know that.