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dredger
06:24:40 Wed
Feb 20 2013

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Re: Dredging w/Hydraulic Excavator

Sorry guys, I am working on it, :confused:

  
dredger
10:10:50 Wed
Feb 20 2013

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Re: Dredging w/Hydraulic Excavator


Hey guys, sorry,I have been so dominated with other stuff for so long, :confused:
However, :smile:
I added the shaker table thread with another line of thought, it is still relative, but considering Fleng and Geowizards and peluks kind words of interest in a compressor concept, thanks very much guys, I think we should continue with the above compression sluice concept, and hopefully some further development in construction,
I skipped through the previous discussion on the thread pertaining to CSC, and have the line of thought that i missed my line of thought concerning point of interest using the different mats, and a little tiny bit of theoretical theorizing on gold sizes and sources. And the question, could a compressor mesh and mat sluice be more accurate at recovering ultra fine gold better then a shaker table, ??, Or, could a mesh and matting sluice be place behind a shaker table to catch whatever the table loses, ??. And how to apply this concept to a high banker, or 8 dredge,
One source of gold that I have not heard much of is the gold mined through stampers, lots of stampers, lots of gold lost, there are lots of stampers in my area that erode into my river dredging operations, , it is my opinion that in my area, there were allot of stampers , mining records show allot of gold losses, So in my situation I believe there is a great deal of gold that is an added source to a natural gold producing eroding area, creek/ river,
And good reason for me to focus on its recovery, which in turn will improve fine natural gold recovery, and another good reason that might come back to me, soon,
So for the new guys the scenario goes like this,
Hard rock miners dig out a hell of allot hard rock and gold, put it through stampers, allot of gold is lost as free floating, a hell of allot as small balls of amalgam, washed off the copper tables covered in mercury, the crushed rock and gold washed over the table, gold is supposed to amalgamate with the mercury on the table, new guys please note, as a rule mercury and gold can amalgamate and the amalgam ball contain 60% gold, so if a stampers operator was not experienced, and or gold amount of gold in the raw rock rose without notice, the mercury would load up with fine gold quickly, and form balls that were washed over and down the table, and off, looking something like this,

testing
[2 edits; Last edit by dredger at 10:37:17 Wed Feb 20 2013]

  
dredger
12:30:15 Wed
Feb 20 2013

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Re: Dredging w/Hydraulic Excavator

this pic shows draining the liquid Hg off the metals.

this pic shows a wet /dry amalgam remains,

This pic shows dry amalgam ball, which is gold,
sorry got prob, basap.


  
dredger
00:36:38 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

this pic shows top right, 3 dry amalgam balls,

this pic shows dry amalgam balls break up easerly.

More dry amalgam balls,

testing.

  
dredger
00:45:33 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

I would suggest This pic shows a ball of amalgam trapped in a layer of gravels before it dried out,

  
dredger
00:49:07 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

More signs that an amalgam balls dry out trapped in gravels,

  
dredger
04:23:25 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

sorry having probs with photobucket. back asap.

[1 edits; Last edit by dredger at 04:28:54 Thu Feb 21 2013]

  
dredger
04:37:34 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

111, So, the bad news about thinking that amalgam balls could be a payable gold source, is a dry out amalgam ball contains very small fine bits of gold, which easerly are crushed by hand with a small rock, in a grinding fashion, meaning most dry amalgam balls are ground in to fine gold in by the creek, some like the ones I find are still complete and in a ball or peanut shapes, my line of thought is a few survive but most are ground to very small gold,
Please note, some amalgam balls shown above are made up of super fine bits of gold, ( Likely to have been crushed in a stampers), and some appear to contain small water worn flakes, (As found in creeks or beaches ), as seen in the pics above,
Please note I have observed both super fine and small water worn flake balls in my area, creeks and rivers, perhaps suggesting amalgam balls end up in a river in two ways, 1, from stampers,2, when Hg is used “ in” a sluicing operation often associated with hydraulic mining, , New guys please note, history confirms Hg was placed in troughs in large long sluice boxes. Around a ton of Hg in a big sluice was common,
So, the line of thought is crushed fine gold from stampers, and how small is the fine gold when the ball is crushed and ground by erosion, moving down creeks and rivers, ??,
This pic was very hard to take and there are 2 small black rocks, and a few tiny black bites, but the rest is tiny gold bits,

  
dredger
04:43:09 Thu
Feb 21 2013

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Re: Dredging w/Hydraulic Excavator

Next pic, is refocused on the hair, shows tiny gold bits on the 90-100micron hair, some bits perhaps around 30micron, gold laying on or attached to the hair, are there, due to electrostatic effects,


  
dredger
01:31:57 Fri
Feb 22 2013

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Re: Dredging w/Hydraulic Excavator

pic 1.

  
dredger
01:49:50 Fri
Feb 22 2013

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Re: Dredging w/Hydraulic Excavator

pic 2.

pic 3.

  
dredger
10:11:51 Sat
Feb 23 2013

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Re: Dredging w/Hydraulic Excavator

Ok, new guys please note,
Randy Clarkson, said and showed riffles /vortexes ( gold sorting crescents ) hard pack or hard pan in 12 minutes of starting up and running a sluice,, and flat flaky gold and or chunky round gold can simply ride over the hard packed gravels, and out the back, and I agree,
a couple of scenarios,
Fitting a compressor concept to any sluice, high banker , can be fitted with suction, or dredge sluice, I would suggest would be a big advantage, perhaps a very quick de- compression, fairly slow re-compression, perhaps once every 10 minutes, ????. Hope fully eliminating hard packing,
Line of thought here is the mating should begin sluicing compressed, and the decompression stroke be say ½”, depending on the number of layers of mating, maybe up to 1” or 1 and 1/2 “ , with the line of thought that as sluicing continues, the compression stroke is decreased, and the gold storage capacity is increased,

ok I think some sketches might be easier,
Back asap.

  
Coeur_D_Alene
20:45:19 Sat
Feb 23 2013

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Re: Dredging w/Hydraulic Excavator

Kind of Off your main thought process but...What about some kind of a water hammer effect that will "drive/push" the fine gold and heavy's through a "P" trap type vent in the form of a sandy heavy slurry into another vessel/cons trap. Sorry probably thinking to technical.

  
dredger
22:32:46 Sat
Feb 23 2013

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Re: Dredging w/Hydraulic Excavator

Hey Coeur_D_Alene

Bit tec for me, any chance of you doing a drawing please. :confused:

  
dredger
05:05:07 Mon
Feb 25 2013

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Re: Dredging w/Hydraulic Excavator

The variation of number of layers of matting, and drawing the matting, variations in mesh, and drawing the mesh, perforated metal, and drawing the perforated metal, variations of water flow direction, and drawing the number of different water flow options, ??? and variations that could be tested to fine tune the concept is extensive, so I am thinking of some pictures, might be better, ???.
But first I should finish what I was saying, above,
Line of thought here is the mating should begin sluicing compressed, and the decompression stroke be say ½”, depending on the number of layers of mating, maybe up to 1” or 1 and 1/2 “ thick , with the line of thought that as sluicing continues, the compression stroke is decreased, and the gold storage capacity is increased,
Please refer to pics on previous pages, 3, and 4,
One Scenario, a good size high banker with 3” suction set up, fitted with the compressor arms, sponge attached to thin fine matting is laid in the bottom of the sluice box, on top of that can or could be a large hole ½”perforated sheet, on top of that is a layer of fine expanded mesh, the mesh open is facing back up the flow, on top of that is 2-3-5 layers of matting, on top of that expanded mesh suitable to is size screen usually fitted to this high banker, the compressor arms are fully compressed, sponge is fully compressed, layers of matting are also compressed,
Just one of many variations of “ operating methods for fine tuning “could be, the sluice is run for 10mins to move some top over burden, wait until the flow is clear, then the operator then releases the compression lever, slowly, the flow remains clear as some of the lighter coloured gravels moving in the vortexes are pulled down into the matting by the “ water /flow “ being sucked or displaced down through the matting, into the expanding sponge, the operator then squeezes the handle so as to compress 1/3 of the sponge thickness, causing the sponge to force water to displace upwards, and fluidize materials in the mating and lift silt and lighter material silt up into the flow and visually seen, repeating this 1/3 compression of the sponge should clear most all silt from the sluice, then the operator might vigorously compress the sponge 2/3 of sponge, and see light coloured sands being lifted and reintroduced to the flow, and move down the sluice, in turn vigorous pumping which compresses the sponge and matting should eject brown and dark colour heavier gravels back into the flow to a certain extent, he re-sets the compression lever to compress the sponge and the mating,
So the operator gets a feel for it,
And get to sucking or shovelling , for 15 minutes, then just let the flow run clean so the operator could see lighter gravel moving in most vortexes caused by each and many riffle like expanded raised sections of the expanded mesh,
((( ( right angle riffle also show materials moving around in the vortex action, )( new guys please note these rantings), = A vortex powers the live crescents and scourers the mat, and in my opinion is the optimum point where gold is recovered, the vortex must have enough energy ( spin) to scour the matting and keeping medium Sg gravels ( med dark to light colour) moving in the live crescent. However, once allot of black sands have been run through the sluice, b/s and heavies quickly build up under and around the live crescent and restrict it, and visually making the live crescent area smaller, these materials pack hard, and gold is rejected to the next vortex, so my suggestion is to keep checking the size and energy of all vortexes, ))) ( also have the thought, that when heavy Sg gavels are added to a given body of water, the body of water “ looses energy ”. )
At that point the operator could release the compression arm lock, and release the lever just enough to allow the mating to decompress and open more storage area in the “ mating”, “without compressing the sponge, or causing water pressure to be forced up though mating “, I would suggest the operator would see materials fall into the matting that were moving in the live crescent, recompressing the mating should be enough movement to cause heavy Sg gravels to sink below lighter Sg materials, re-present the lighter materials back in to the vortex, ??, after a few squeezes, but defiantly eliminating hard panning or hard packing in the vortex peripheral, freeing up the live crescent where heavy Sg materials are separated from lighter Sg materials, and forced into the matting for storage and further Sg separation,
Please note, in another scenario, perhaps testing will show that by allowing say 1/16” or 1/8” decompression of sponge in the above scenario or high banker sluice may encourage better or be more efficient Sg sorting in the matting, ??,
Rule of thumb concerning compressor concept is the sponge is only soft, and compresses easily, layers of matting are harder to compress, and only begin to compress once the sponge is completely compressed, that is how it works, works meaning there is an accurate separation by specific gravity with in the matting and below the forces of rushing water above the matting, as mentioned earlier, the compression stroke can be steady increased to increase storage area within the matting, , perhaps though out the day, or a few days, ?? Depending on the richness of the ground,

As to a high bankers or dredge ability to recover micron gold similar to shown above, I would suggest any micro fine or fine caught in my dredge was basically by chance because the water flow in my centre sluice was to high and fast, am I guessing in saying most fine gold travelled in the flow above and out of the level of flow that travels through and powers the vortexes, side box were a diamond pattern, may have caught by chance some extra fine gold, the screen was a joke and not designed for gold in suspension, and there was always some under screen size gold in the centre sluice,
Highbackers do also run high and fast levels of water flow over the riffles/ mesh, relatively speaking, so some fines must be carried away, but, if any super fines or fines or even small gold do travel in the flow that is powering the vortexes, I would suggest micro fine and fine gold would be subject to “ a better chance “ of be being forced into the matting, hit mating or other gravels and stop dead, and settle into and on mating, the chance of this happening can only be increased by having a good vortex, live crescent, and clear visible scoured section of mating, I guess.
I am still confident the sponge will not be much of a problem concerning silt build up, but you never know,
Next is some more blar blar on placing a compressor concept behind a Gemini table type shaking table,
:confused:

  
dredger
23:40:46 Mon
Apr 29 2013

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Re: Dredging w/Hydraulic Excavator



testing.

  
dredger
00:26:04 Tue
Apr 30 2013

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Re: Dredging w/Hydraulic Excavator

When buying a excavator all pins should be checked for wear, and asked if any pins have been replaced, bushes, or turned, in my experience there allot of people either do know pins can be turned, and allot of people do not know or care, odd or fresh shades of paint could be a clue, or similar brackets or extra holes more clues, some may say the pin has been replaced,? But it has only been turned, some people replace pins and bushes when only half worn, ?, So basically any pin could be any condition,
So if you do not know, to extend or get extra life of your pins and reduce the machine slap with worn pins, usually they need to be machined and turned, and welded again, big dollars, or you can make a bracket or drill the pin or pin collar, as follows,
1, being one type of pin lock, (and bolt) top view, this pin cannot be turn unless you machine it, turn it , then welding again,
2, being side on view ,
3, being made up bracket that fits over the original pin lock, that has been turned 180 degree,
4 is top view of made up bracket,
5, is another type of pin lock,
6, is the pin,
7, is extra hole drilled in the collar allowing the pin to be turned ¼ at a time,
Back asap,

  
dredger
09:19:40 Tue
Apr 30 2013

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Re: Dredging w/Hydraulic Excavator

Ok, sorry, got to change direction again but still on thread “dredging with a excavator”, focus is re-focused on a sucker nozzle due to a few interesting new ideas,
This concept of “dredging with a excavator “ requires,? a excavator, large vol, thin v-bucket, 1m wide with 2cum capacity, a sucker nozzle which is fitted with latest modifications, and a large sluice, that all, just a sluice, or large volume processing unit,
My line of thought is the latest mods ideas to the nozzle will increase production heaps, 2 maybe 3 maybe 5 times that of a normal dredge capacity,
Please note, also, the line of thought is to move the dredge “pump” into the nozzle, and power the dredge pump (1500gpm Keene) into the sucker nozzle, along with a high pressure blaster pump ( 350gpm Keene ), hydraulic drive off and with the power of the excavator,

Point of interest, both pumps will be self priming, no troublesome foot valves, and controlled by the operator,
As much as I would like to think through this with you guys, I should be a little busy over the next few days, so as per usual next posts will be erratic,
Back asap.

  
klondike_jake
06:18:51 Wed
May 1 2013

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Re: Dredging w/Hydraulic Excavator

why not do 90 % of the work with the excavator then flood the hole and use the dredge to just clean the bedrock good.

  
kaveman
15:10:36 Wed
May 1 2013

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Re: Dredging w/Hydraulic Excavator

Quote: klondike_jake at 06:18:51 Wed May 1 2013

why not do 90 % of the work with the excavator then flood the hole and use the dredge to just clean the bedrock good.


That's exactly what we're doing. Been trying to do it for the last three years, but have gone at it from every conceivable angle and haven't succeeded yet. Tried dredging in 5-7' of zero visibility water/mud and failed. Tried several different iterations of the sucker nozzle(and failed). Now we're about a week away from trying to clean it up with a dredge in 1-2' of zero visibility water. I can see many problems with that in the near future, but will report what we find.

Mechanized would sure be easier, but I just couldn't seem to get anything through the nozzle from the excavator. I may have pictures,.....maybe even vids,.....but I lost everything from 2012 in a hard-drive crash and haven't sorted out what I've been able to recover.

  
dredger
04:09:44 Fri
May 3 2013

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Re: Dredging w/Hydraulic Excavator

back asap :smile:

  
Fleng
17:38:22 Fri
May 3 2013

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Re: Dredging w/Hydraulic Excavator

Anyone tried using a submericble slurry pump? Here's a used 6" for sale for $1500.

http://www.ebay.com/itm/Submersible-slurry-pump-/181128455376?pt=LH_DefaultDomain_0&hash=item2a2c18e4d0


ebay item [204 clicks]

  
dredger
03:20:48 Mon
May 6 2013

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Re: Dredging w/Hydraulic Excavator

Sorry guys , been on the road 5 days, and busy as right now,
Hey jake,
I agree very much, but for the new guys information, we also have to consider which %90 we are talking about,
For example, placer situation, and the top layer is glacial silt, ect, with no gold bearing gravels, laying on layers of gold bearing gravels,
"Why not do 90 % of the work with the excavator
Then flood the hole and use the dredge to just clean the bedrock good ",
Agreed,
Another example is in my situation where river gold bearing gravels start at the top, so I dig a hole which is full of water and I wash everything, as part of the method of dropping in the gold as I dig the hole,
So new guys please note we are talking about removing gold bearing gravels and none gold bearing materials, and either having water in the hole or not, ??. so,

My line of thought right now is about getting fresh clean water in the work hole, filtering dirty water and even recycling filtered dirty water into the work hole,
More dredging with excavator stuff, please note the first sketches, tapping into the flow, and recycling filtered clear water back into the work hole,
http://bb.bbboy.net/alaskagoldforum-viewthread?forum=2&thread=506&postnum=0
New guys Please note in the aerial pictures (two sites, USA and Australia) the flowing stream there are small rapids, this indicates the water flow is falling at a good angle, that and the fact if you dig a hole out of stream in the gravels it will fill with some or allot of water, my point being you can tap into clean filtered water moving through the gravel bed, ok it is dirty when it is dug, but quickly clears,
Trench.

I cut this trench as quick as I could just to get clean water from the flow on the other side of the river, I also observed that soon more water was filtering with the high side wall of the trench then was coming from the river flow, which was enough to have clear dredging water, please note digging the hole and trenching results in dirty water for a short term, then the mud settles, 3-6” deep, so if you are a new guy and never actually dredged before, you will quickly learn to keep the water clear, you suck up the mud layer before disturbing it, it is that easy ,

Filtering dredge tailings water is in my experience is a little tricky, for the new guy with no experience, some good tips coming asap,

  
dredger
07:23:38 Sat
May 11 2013

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I said,
Hey jake,
I agree very much, but for the new guys information, we also have to consider which %90 we are talking about,
For example, placer situation, and the top layer is glacial silt, ect, with no gold bearing gravels, laying on layers of gold bearing gravels,
"Why not do 90 % of the work with the excavator
Then flood the hole and use the dredge to just clean the bedrock good ",
Agreed,
Now the bit I forgot,
I should have been more specific and said " use the sucker nozzle attached to the excavator to clean and recover most gold on bedrock or on hard packed layers,, then the diver goes in and quickly checks the bottom, and does any crevices”,
Another new 30 sec old thought is to fit a clip on suction hose for the diver?? 5”, to the suction nozzle, ??. so the excavator fits the sucker nozzle, and starts sucking the bottom, after ¼ of the hole /bottom has been sucked clean, the water in the hole will be clear, the diver takes his ?? 30’ of?? 4” very flexible suction hose, and attaches his hose to the excavator suction nozzle , and both the diver and the excavator operator can work / suck safely because the water is clear, and the excavator operator can see everything, and focuses on moving the machine slowly around the other end or ¾ of the hole, more on the new ideas on a super excavator suction nozzle coming,
Back asap

  
dredger
02:34:16 Tue
May 14 2013

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Re: Dredging w/Hydraulic Excavator

Ok, am having trouble with photobucket, so I will have to leave the filtering tips until I get photobucket working,
One point of interest that sticks in my mind is about digging a hole in dry ground then filling it with water and dredging it,
Generally speaking to new guys, I suggest this line of thought be maintained, the dredge hole or more important the height of the water in the dredge hole is a important factor, as opposed to digging the tailings filter dam,
In fact, when the hole remains open over night, next morning the dredge hole will be full, and the tailings dam will be empty, drained over night,
So I would suggest to keep the work hole more like a swimming pool, as opposed to the tailings dam aka drainage pit,
My experience is to tap into the main flow, my observation was while digging the intended hole, it fills with water, the focus was on dropping the gold, by washing the gravels using the forces the excavator does produce, which forces most clay silt mud into suspension, and because the water level is as high as I can get it, that water is actually being forced through and out the surrounding gravels walls, carrying the silt with it, resulting the walls block up with silt, at which time you have to start restricting the flow into the hole,


Cooks on site

[1 edits; Last edit by dredger at 02:38:02 Tue May 14 2013]

  
dredger
00:40:30 Fri
May 17 2013

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Re: Dredging w/Hydraulic Excavator


testing

  
dredger
23:44:42 Fri
May 17 2013

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Re: Dredging w/Hydraulic Excavator

Please note the height of the water in the work hole in both above pics, new guys please note the method being used, is focused on the sluice being placed or laid on an undisturbed gravels dam wall, the 12’ long x 6’ wide triple sluice basically has no frame, or floats, to get the sluice as low as possible, the focus is on raising the water “ under “ the jet to minimize lift in the expansion chamber, / jet, and level with the bottom of the box “at the head “, this improves dredge performance,
Please note top pic shows water level in the tailings dam is a few inches above the rear of the sluice, ( it takes a few hours of dredging to bring up the tailings dam water level, at which time I lift the engine pump frame up a few inches setting the level so the foot valves are only have a few inches lift,
Dig time was about 2 and ½ hours, rehab about 2 hours,
back, asap.

  
dredger
04:56:48 Mon
May 20 2013

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Re: Dredging w/Hydraulic Excavator

Please note the height of the water in the work hole in both above pics, new guys please note the method being used, is focused on the sluice being placed or laid on an undisturbed gravels dam wall, the 12’ long x 6’ wide triple sluice basically has no frame, or floats, to get the sluice as low as possible, the focus is on raising the water “ under “ the jet to minimize lift in the expansion chamber, / jet, and level with the bottom of the box “at the head “, this improves dredge performance,
Please note top pic shows water level in the tailings dam is a few inches above the rear of the sluice, ( it takes a few hours of dredging to bring up the tailings dam water level, at which time I lift the engine pump frame up a few inches setting the level so the foot valves are only have a few inches lift,
Please note last pic, the dredge pumps are positioned in the tailings dam, also please note in the above larger picture, the rear of the sluice cannot be seen, but the 13hp red engine cover can be seen mounted in the frame, (petrol tank is removed) black exhaust cover can also be seen, please note motor sits in a s/s metal tray,
Please note the water level in the tailings hole will rise quickly, once the water level rises above the frame base, and the s/s metal tray more or less floats, this results in the pump inlet will only be a few inches above tailings dam water level, (less pump lift ) water level in the tailings dam is easy and quick to control,
Why control,??, = Minimum environmental foot print, and how long a tailings filtration dam has to be , and constructing a suitable efficient filtering dam to suit an 8 dredge water through put,
In my situation in my area, river erosion, rocks and all look roughly the same, as most other rivers, I would suggest a 8” dredge operation would require a 40’ tailings dam including foot valve area and 20-30’ filtration wall,
And I am guessing that a 10’dredge operation in the same river hole / materials might have to 60’ long respectively.
The length of the tailings and filter dam walls is relevant to the water through put of the dredge nozzle,
Back asap,

  
dredger
05:49:14 Mon
May 27 2013

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Re: Dredging w/Hydraulic Excavator


Please note, the filtering dam walls stop filtering as the silt builds up on the inside of the filtering dam wall, my experience was to dig the hole shown in pics, then a few days of dredging and crevices. I would see the tailings dam water level rise up to the catch tray, ?? (New guys please note the catch trays under the motors are to catch any or all oils that maybe accidently escape from the pump motors, and is part of the EPA Lic requirement,) At which time I use the excavator to skim the built up silt, building up the filter dam wall, this can be done very quickly, just by setting the bucket to skim the built up silt off the wall, and walking or driving the machine forward 30’ parallel to the dam wall,, and back again, a few minutes operating the excavator clears the silt for a few days more dredging, or just by using a wide broom, to sweep the built up silt, down off the wall into the trench, 10 mins,
So, at that time, my observation, was I quite surprised to see amazingly clean clear water about 4” deep flowing freely along about 30 feet of dam wall, into the main flow, “ in the beginning “ or when I first started dredging with a excavator, I dug long 100’ tailings dams, which works great, with hardly any filtered water passing through the wall into the flow, in fact, the dam wall was placed between the tailings dam the main river flow to stop the turbid tailings water entering the main river flow at all, which evolved into the “ small environmental Key hole mining foot print, focus of keeping the foot print or total surface area to a minimum, this also reduces the or any “bond” or moneys paid for or to ensure rehab.
New guys please note, I observed enough to suggest the best dam gravels to filter silt is not the light Sg gravels found high on the river banks, only the gravels found or travel in the main flood run carry the heavies, ( black sand and Gold ), do provide quick working and efficient filter medium,
Back asap.

testing.:smile:

  
dredger
02:55:40 Fri
May 31 2013

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Re: Dredging w/Hydraulic Excavator

Please note, I had already started back filling or levelling the rear of the rear of the tailings dam before I remember to take a picture, confused: sorry.
New guys please note, the large tree near the hole/trench, also in the river gravels as reference,
Please note the water height of the river,
On left of pic shows shallow tailings trench, with 3-4 foot wide base x 3-4 foot high filtration wall, on right side of trench.
Please note there is really no wall on the left side of the trench required, the rear of the trench I usually just curl the tail of the filtration dam,
Please note that the filtration dam and walls are basically very quick to dig, extend, modifying,
Sorry, back asap.

  

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