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Dave_Mack Offline 324 posts Administrator  Reply |
Here is a pretty extensive explanation of the system which we have developed to help effectively recover more fine gold on our suction dredges!
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InspectorTom Offline 424 posts  Reply |
Thanks Dave!
Very extensive explanation of your new recovery system. I am going to have to go over that more than once. What more could a man do to help his fellow miners retain more gold! Tom |
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JABsWorld Offline 64 posts Reply |
Thanks Dave for your extensive explanation of the double classification system. Great job!!!!!!!!!!!!!
 JAB |
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Dave_Mack Offline 324 posts Administrator Reply |
Thanks, guys. In the next few days, I'll add one more diagram that shows a side-view of the system with the riffles added for larger gold.
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colo_nuggets Offline 529 posts Reply |
Hi Dave,
On the wider sluice boxes like on your 8, I see under screen supports. Are these the same size as the outer screen supports? Thanks Scott |
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JABsWorld Offline 64 posts Reply |
Hi Dave! Additional diagrams would be outstanding! I may attempt to put this together since I have two ProMac 5 inch dredges. I am a little hesitant to attempt fabricating it myself since I am not exceptionally skilled at some of the technical requirements i.e. welding, machinist skills etc. May give LeRoy a call to see if he would be willing to put it together for me. I want this thing to work and work smoothly without wrinkle. Thanks so much for the designs, testing, knowledge, and skills. Most of all thanks for sharing this with fellow miners. How's the workouts going? I know from experience that your metabolism changes drastically as we age. I am 67 yrs. old now and have a conditioning program going utilizing a treadmill, bowflex and nordic track. Got tired of the agonizing pain the first two weeks of the season when I was not prepared i.e. in shape. Thanks again Dave! From an old seadog. JAB
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Rod_Seiad Offline 632 posts Reply |
Hey JAB,
You're already working out for the June season? You're redoing your barn full of dredges to match Dave's South Pacific special? OK, but if you start running two 5" Promacks simultaneously. How in the world? Do you figure on a right and a left handed setup or just work that out later? Suppose you get both nozzles stuck on the same cobble, hand, foot or head? Can you picture that? I don't know Jim, you're thinking outside the box again. |
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JABsWorld Offline 64 posts Reply |
Hi Rod! Fitness Program: Yeh, I thought I could use some conditioning. Retrofitting the dredge is contingent on the sale of one of my nuggets on E-Bay. I really believe Dave has a good system going for fine gold recovery. Why not copy the best! What did you think of the system? Take care,
JAB |
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colo_nuggets Offline 529 posts Reply |
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Dave_Mack Offline 324 posts Administrator Reply |
I added another diagram to the article which provides a side view showing how we are separating feed material into 3 separate classifications, each which is being directed into a different recovery system.
If you look closely at the diagram, you will see another reason to put the larger riffles towards the rear-end of a double-screen system. See how all or most of the fines are directed through an undercurrent below the larger riffles? This means the larger riffles will not be getting flooded and loaded up with heavy fine-sized material. So, while fine material gets more exposure to low-profile riffles (where it belongs), the deeper riffles remain more open so that larger gold has a place to drop out of the flow. |
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Rod_Seiad Offline 632 posts Reply |
Dave,
Your new side view clarified a few things. Now I get it! I want one. |
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riverwatcher Offline 67 posts Reply |
Hi to all,
quick question ...I was looking over a website and found this and wondered if this could be something used as the second tier level for a dredge for catching the fines or would it need some moss or a punched plate to slow the flow down? http://www.casluicebox.com/H-B--Sluice-Boxes.html |
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markB Offline 212 posts Reply |
Wow, these guy's have added alot of products in the last year. I got one of their concentrators a year ago (http://www.casluicebox.com/CONCENTRATOR.html)
and am pretty happy with it. It appears that they used "Dropped Riffles" for most of their products. The small unit I use for fine concentrates works well with a very slow flow of water. The product (material)seems strong enough to be used in a dredge. My concern would be adjusting flow and balance to keep the dropped riffles from filling up or washing out. In my case I'd need two 10" sluice units for a 20" box. About $100.00. If the company reads this (hint!!) I'd experiment with a couple of samples this year in my 5".... |
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markB Offline 212 posts Reply |
I'd do some experimenting with various combinations of punch plate and slick plate lengths to acquire a balance of material/flow, maybe adjustable depending on conditions. But then again I've never used a Le Trap so what do I know.
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johnnye4 Offline 220 posts Reply |
Anybody have a reliable source for wire weave #8 mesh in 48 by 48 with 1/16 of an inch wire?
Thanks in advance. johnnye4 |
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BNUGGET Offline 100 posts Reply |
I don't know of local dealers but here is Mc Master Carr.
http://www.mcmaster.com/#wire-cloth/=b389f2 Brandon |
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johnnye4 Offline 220 posts Reply |
Thanks BNUGGET.
I haven’t been able to find anything on line with metal wire weave #8 & #4 mesh for order/ pricing. I was able to find locally in central Oregon an outfit that took a day to track it and price it…at $105.00 for a sheet of 48” by 48”, not sure if that is a good price and if there mark up is half then I would like a second choice. This is not coated or dipped, just raw steal. I haven’t any experience with ordering or purchasing metal mesh or weave so I totally appreciate the help. I didn’t see anything in metal wire weave at this site…it did have plastic but no metal (steal). I am attempting to upgrade my triple for the upcoming season……. Thanks Johnnye4 |
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johnnye4 Offline 220 posts Reply |
Riverwatcher
Good sight with an abs high banker sluice, was going to make my own but someone already created the perfect sizes for my dredge . Sides and some more custom cuts, this could work for upgrading. My sluice sides are 9” wide so the 10By 39 for 50.00 plus shipping works good and center sluice is 16”wide this works with the 16 by 42 for $75.00 plus shipping, this works perfect for my dredge…..thanks for info. Have a trip coming to visit my grand child in Yuma AZ this coming month so will stop by casluicebox and save on shipping. Thanks riverwatcher not my post didn’t start it but am very happy with this info……. Johnnye4 |
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markB Offline 212 posts Reply |
Here's a site for just about anything "wired", this a pdf download from "Directmetals.com" :
http://www.directmetals.com/dm/direct_metals_catalog/wire_woven.pdf |
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riverwatcher Offline 67 posts Reply |
Your welcome Ya'll... I hope it works well I am ordering one to use as a sluice on the next trip to the Llano river here in Texas. the gold is very fine and hard to find.
wish I could be in Happy Camp this summer. |
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Birddog321 Offline 2 posts Reply |
Hi, I am intrigued by this double screen classification sluice and I thank you Dave for sharing it.
Am I correct that you have tossed aside the plastic sluice idea and have gone with V-mat covered by expanded metal along the entire bottom of the sluice instead? You mention you add miners moss to the header section. Why? Is the V-mat insufficient in that area? Thanks in advance for your help. |
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bearkat Offline 76 posts Reply |
Good article Dave...
I got to see first hand last season their continued modifications and improvements on the sluice while mining. Seeing the double screen work its magic I then modified my 6" Keene mini's highgrade section to recover finer gold also. I put a double screen over the first 10 inches of the box with deep V-Matt under that until the miners moss came into play. Results: I did catch finer gold higher up in the sluice, but all the iron in the Rogue loaded it up a bit much in the high grade area. So I took it out as the gold was TOO BIG! Ha, nice problem to have... However, I put it back in when I dredged our claim on the Applegate because of much finer gold there...and wow, it did work very well there as my high-grade section caught and filled with lots of fine gold and I could check my values without doing much else but looking in the box after taking out the screens. This was a very low cost modification which worked very well in a standard Keene designed box. If the fines were missed in the high grade area they were most always caught in the lower 3rd stage. Results from the Applegate: 1 dwt in every 5 dwt were smaller than 50 mesh gold and 25% of that was 100 mesh and smaller. I did not have that good results the previous year without the double screen in just my first 10 inches of the sluice. Maybe I'll cover the entire highgrade section this year in double screen. Alan
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Birddog321 Offline 2 posts Reply |
Thanks Alan,
Just 10 inches ya say. Hmmm. One of the things I liked in Dave's article was the aggressive 3/8" classification over what appeared to be about 3/4 of the sluice providing a lot of material time on classifier. Then the 1/8" classifier screen runs the entire length of the sluice if I understand it correctly. The classification and flow reductions provided are what I'm most interested in. How much flow reduction is typical between the screens? Could one expect a 1/3 reduction in flow with each screen? Also, was there a problem with the 1/8" plugging up or blinding? Thanks for the input. |
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colo_nuggets Offline 529 posts Reply |
Having your screens adjustable is what controls the flow in between the screens. If you have a bunch of small material, overburden,sand,you can pack between the screens. 1/8 screen, 1/8 opening they can be different depending upon the thickness of the wire used/gauge size used. If it blinds just adjust the screens till they dont. Works great in hardpack!
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bearkat Offline 76 posts Reply |
Yes; Daves system is very custom, I just modifyed mine without much cost. Also on my Keene I have the lower 3rd stage section, which catches fines also. Daves dredge does not have this...so I just did my double on the high grade area, which did well.
Here are pictures of the lower highgrade section screen, without the main stock Keene screen covering it. http://www.flickr.com/photos/bearkat4160/sets/72157629296208272/ Alan
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