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people online in the last 1 minutes - 0 members, 0 anon and 0 guests. (Most ever was 29 at 13:36:32 Sat Aug 3 2002)

   
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kavemanRe: Is that Armour Weave?
Just regular expanded.
Jim_AlaskaRe: Is that Armour Weave?
Tom,

I have armour weave in my 4" ProMack dredge. This stuff is not armour weave.

Armour weave is easy to identify; It is made of a sheet of steel with the "eyebrow" riffles punched in it. This means that the steel sheet is still there and can be easily seen.

So basically you would see a sheet of steel with the riffles punched out. It would not be like a large piece of expanded.
tvanwhoIs that Armour Weave?
Is that Armour Weave raised expanded metal like Dave McCracken once used in his small highbankers and sluices? I cannot find that stuff anywheres? Mind if I ask where you found it at and how to get some?
Thanks,

-Tom
kavemanRe: Shaker Plant Vid
Well, the first 50% loss seems like a fair guess. I'm basing that on the Yukon study where they found that they lost 1/3 of the gold in the bank by dry screening to 3/4". They went back and wet screened the oversize and recovered an additional 30+%. That came from a commercial grade Yukon paylayer that can't be near as tenacious as the cemented caliche of Arizona.

I also don't think an estimated 50% loss once the gravel got to the shaker plant is out of line. The best sluices running are only in the mid to upper 90's in recovery and there are many that perform down in the 60's and 70's, especially if they're running with minimal water. I suspect they're also losing a fair amount before the sluice even comes into play. If you look at the beginning of the vids, you can see just how poorly washed the oversize is as it's coming off the screens and discharging over the conveyor. That type of cemented material really needs a good scrubbing in a trommel. The shaker screen doesn't work very well unless the gravel is clean washing. Actually, that caliche probably needs a crusher to get above 90% recovery no matter what plant is being used.

Here's the before,.......





And after modification,.................




Old carpet was indoor/outdoor. New carpet is backed 3/8 miners moss.
pelukRe: Shaker Plant Vid
As far as losses caused by inadequate flow,I couldn't speculate.I think the riffles regardless of the design,were put there for a couple of reasons.One would be to hold the screens more ridgidly and the other would be to catch nuggets lost from the expanded.

Watching the action in the sluice it appears water is shooting straight up from the bed in finger shapes.This would give the impression that a vibration is forcing it to do so.As it does,i lifts the gold with it and leaves it susceptible to the oncoming flow...which moves the nugget along to the next diamond.The gold was not up against the upper apex of the diamond but rather wherever it happened to land.You could say this happened at shutdown but that seemed to be where they were during actual operation.Another man and I watched this take place and he commented on it.

If it were my rig,I think I'd rerun material that was sluiced.I would like to think it would have less silt in it so I could observe the action.i'd have enough so i could run at ordinary flow rate or even meavier flow as jim suggested.I'd add lead shot some smashed flat while others were left rounded.Maybe paint them yellow so they would show up in the flow.Run it both with and without vibration.

Whatever it takes,that plant could be made to work much better without much effort I'd bet.You could probably even salvage those riffles if they didn't work.I'm guessing they could be drilled along the length and have angled stock bolted or even tacked on.Witgh bolting you'd be free to try various shapes.

I've seen people wrestling with sluice bedding variations.As I see it,if a gold specimen peaks above the mesh weave,the flow can take it and make it migrate.This is why, both on the beach and back in the creeks,expanded is best followed by a short section of riffles.Bouncing the specimen around in the mesh exacerbates the problem.

I yield the mike.
tenderfootminerRe: Shaker Plant Vid
Great video thanks. My personal feeling is it didn't lose near the gold ya think it appears to be an odd sluice with unusual sounding ripples ,which I have seen on other plants that shake. the action more than the water places the heavies as they are washed. unlike a normal sluice it would require much less water.however I still would check the tails lol I have been wrong in my assumtions before :devil:..ws
kavemanRe: Shaker Plant Vid
We haven't run it post-modification. In fact, we haven't run it at all. The vids were posted by the guy I purchased the plant from and he ran that gravel several years ago down in Arizona. I would certainly agree that a bunch of gold was lost and I too would love to run the tails. They ran that cemented AZ stuff over a dry 3/4" screen and then fed the undersize to the plant. I would imagine that they lost 50% of the gold in the screening alone, and would be surprised if they didn't lose another 50% of the remaining gold with the other problems mentioned with the plant.

All in all, they DID recover a pound of gold from the 200yd that they did run, so if my figures are close to correct, Vince has got at least 36oz left in his driveway!

If things go according to plan(something 'things' are not known for doing), I'll be able to report better performance in May after we've had a chance to work our gravel for awhile. The plant's ready to get back in the game with just a few hose connections and a pile of willing gravel.
Jim_AlaskaRe: Shaker Plant Vid
When I watched the vid. I thought, NOT ENOUGH WATER FLOW. But didn't want to say anything about someone else's set up.

I would be willing to bet that with the small amount of water you showed going through it, you must have lost gold.

What you had going over the riffles looked like a "tumbling effect" rather than a swirl, which is what it takes to hold heavies.

It would be interesting to run the tailings and see what was lost if you still have access to them.

How does it run now with the modifications you did?
kavemanRe: Shaker Plant Vid
Even tho we've had this thing on site for almost three years, we haven't yet had an opportunity to run material thru it. All we've done is make some changes that seemed obvious to us and test run the engine to see the shaker run. The sluice shaker is separate from the screen and just has a belt-driven offcenter weight bolted to the bottom of the box. Due to the way the sluice is mounted on leaf springs, there's a very minor vertical component, but mostly it's a longitudinal vibration. The sluice doesn't so much move or shake,.........it's more of a buzz.

I believe the rough water in the sluice is caused by the riffle set used and the general lack of water. The sluice is 20" wide and 12' long and all wash water was provided by a 5HP Briggs from a very small seasonal creek. I doubt if it provided 200gpm and the riffles were fairly crude. There was some flattened expanded on carpet underneath a few inverted Hungarian riffles that were on something like 10" spacing. By inverted, I mean that the normal riffle overhang was turned over and laid flat on the carpet and the riffle that remained was nothing but a sloped flatbar riffle. I can't imagine a worse system,...............too little water with cemented gravel running over a smooth carpet with what I consider a 'reject' riffle system. Rather than gathering up the heavies, the angled riffles toss them back up into the current.

We've doubled up on the water flow and replaced the riffle system with MM under heavy expanded with just a couple of feet of 1" angle at the discharge end. The material we plan to run will have mostly fine gold in it since we're only planning to run the overburden from the bar and the lower pay layer will be dredged. Depending on how things go, we may or may not 'buzz' the sluicebox. All it would take to deactivate that feature would be the removal of the belt drive.
pelukRe: Shaker Plant Vid
Tonight I got to see the videos in full length finally.It looks like a well thought out setup,compact and efficient.

As I watched,I noticed a lot of vibration action in the water.Have you tried it both with and without vibration?If you've tried it without,how did recovery compare? Is there fine gold to be recovered there?

Does your vibration come from the bottom up in the sluice or is it from the sides?(side to side shaking) It must be an effort to keep the suspended
mud from packing by fluidizing.Is that correct?

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