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dredger
05:33:15 Mon
Feb 27 2012

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Re: Thanks for the welcome

Mate, I think this is what alot of your excavator guys could use on u hardpack false bottoms, just use about 7,000 psi pumps on the jets,x 4.

Just dig out what ever the way u r doing it, and quick change to a dredge tied to the excavator,

I tested this sucker nose thougherly and was going to suction the bottom of my holes after digging them out with the bucket,and maybe find crevices or hard pan, ( and it is hard pan, too not so much clay, but still cemented,)that the bucket missed,

ok, hope you can see the fine coloured lines, blue x 6' suction pipe , please note the 6' pipe stick out a few inches,
testing,

  
dredger
06:46:28 Mon
Feb 27 2012

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Re: Thanks for the welcome

444444 Red Lines show the quick change screen/s, this screen over feed the dredge too much, observations were, this overloaded the sluice if moved around to quickly, part of the observations were to overload the dredge in a controlled manner to access the dredges recovery / failure, times,
Yellow lines show 2 of the 4 jets, just above the jet nozzle pipe flares to 2" to 4 into manifold then 3" single to pump, strong pressure, jets are directed to touch in line, the centre of the six inch pipe, just below and outside the screen, observations under water or on rocks and clay above water level, around test sites, showed very powerful blaster, 8hp x 350 standard pump, ??. it would be my intension to increase high pressure pump to around 7,000 psi, 8'to 10"dredge,

Another realization during testing was that the operator with experience of digging and sucking the hole, already has a good mental picture of the hole before diving and actually seeing bedrock, ect,

I suggest a operator with experience could easerly find and blast out and suck up very hard pan, and feel his way to bed rock, please note the feel of the nozzle or tooth touching or forcing it way though over screen size rocks and bedrock, or just sucking and feeling a very big rock, is easy,

testing,

  
dredger
07:19:06 Mon
Feb 27 2012

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Re: Thanks for the welcome

top figure and black arrow show direction of suction, and six inch removable jet tube, dark blue lines show high pressure pipe, light blue shows direction of water jet, also removable,

3 sketches in yellow show nozzle direction ( retracting and extending the hoe within easy reach ) are movement that would slid the rounded nozzle over bedrock and give good feel to the operator for hard pan or bedrock, while forcing oversize rocks out of the way,

Double the length of the sucker nozzle for extra reach,
:smile:

  
dickb
17:22:34 Mon
Feb 27 2012

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Re: Thanks for the welcome

Hi peluk:

"This is one reason an excavator mounted on a barge is doing so well just offshore now.He's really the only one capable of getting through this clay layer."

From what I see on TV,I think that the hoe that is on the barge is too small to dig deep enough. The two videos show excavators with longer booms and dippers. That allows them to dig deeper than the Christine Rose. My guess that is why the barge has to only work in shallow water. The bucket just can't reach below the clay in deeper water. A trommel on the barge might help break up the clay also.
JMHO

Dickb
[1 edits; Last edit by dickb at 17:27:04 Mon Feb 27 2012]

  
Fleng
19:10:30 Mon
Feb 27 2012

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Re: Thanks for the welcome

Phil-
While high pressure blasting might help dislodging placer, it seems like it might also push it out of the way of the dredge head suction. Of course there will be a large percentage of the high pressure fluid that will end up in the suction tube as well. The answer must be a balance of these two effects. Your combo nozzle looks like it would work well for crevices and rocky areas while the suction bucket seem better for a smooth sand bottom.

  
peluk
21:06:58 Mon
Feb 27 2012

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Re: Thanks for the welcome

dickb,it is a fact that the Christine Rose is limited in digging depth.I've heard the owner is planning on putting a larger excavator aboard that barge or another one.However,in one of the scenes in the "Bering Sea Gold" series,you can here Shaun(his son)saying something like 'Dig shallow that's where the pay is'.

There is plenty of good pay in shallow water right in front of town...in some areas.I can't swear to this but I believe there is a trommel aboard that barge.This is why I wonder why it doesn't get more exposure on the film.
I don't think I've seen one shot yet of wwere the material goes after the hopper.

If an excavator with longer boom and dipper were used,it would appear the current deck space would be too cramped and a longer barge would be called for in order to load the hopper.No?

Dredger,if I see the barge owner or his son,I will refer them to your photos and suggestions.His line is busy right now.I'm also going to ask around about just how much I can expect from a frost bucket on schist bedrock.A lot will depend on how the schist is layered.I've seen verticle layering just off the beach.I think horizontal layering would lend itself more easily to a frost bucket.
I've seen big excavators slamming away at schist with a ripper tooth and it is a long task usually done in tandem with a cat and a ripper tooth.In a sand trench,it would bring down the walls and the tooth's impact would be cushioned requiring changeout to a bucket.

You're talking 'underwater' and I'm going back and forth with the offhore work in progress and the onshore plans I have.I'll get out of your hair.


  
dickb
18:20:32 Tue
Feb 28 2012

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Re: Thanks for the welcome

Hi Peluk:

I agree that they don't give much air time to the operation on the CR. Looks to me that they empty into a wash hopper that may run into a vibrating grizzly, then turns to port into a sluice box, then overboard on the port side.

I'm wondering why, that in all the cleanups shown, all we see is say 1/8" down to about 20 mesh. Never anything larger and/or smaller. I suspect that all the numbers that they are posting are phony anyway!

The only hard thing I come away from watching both shows is that it takes big capital to finance a money making mining operation, and it's a lot more than luck that fills those pans.

Hope you have a good season this year.

Dickb
[2 edits; Last edit by dickb at 18:26:27 Tue Feb 28 2012]

  
peluk
01:10:06 Wed
Feb 29 2012

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Re: Thanks for the welcome

Thanks Dick...and to you the same.By the way,I saw an invitation from an outfit that had planned on coming up to Nome with a cutterhead dredge.The invitation was for investors.This included a rundown on what type of gold the Bima(monstrous offshore bucket line dredge) was running into when it worked in the Nome area.

The information is over on the AMDS Prospecting Forum.Just scroll down the threads to the one on the Bima.
The information stated the coarsest gold they ran into was 15mm or about 5/8ths inch.Average cubic meter held 824mg. Highest was 1.120grams per cubic meter.

I'll try to get over to the CR when I get some wheels and take a look at their layout.I thought I saw a trommel mounted on board at one time.


  
homestead54
18:41:32 Thu
Mar 1 2012

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Re: Thinking of designing a high-tech dredge head for use in Nome

design of a cutterhead and how it could work in nome and rivers in alaska with perma-frost- and different types of material.- you can contact me at homestead54@hotmail.com
I have tested many rivers and creeks on this-nome have not tested yet- but look at what is there- and have ideas to imnprove recovery of fine gold without lost of horse-power or incresing it.

  
klondike_jake
02:32:12 Wed
Mar 7 2012

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Re: Thanks for the welcome

a side by side hydraulic setup operated remotely via camera.one operating 12 inch nozzle the other operating hydraulic grabber for sweeping away the bigger rocks.then some way to unplug the s.o.b.use like an exstenda hoe arm the size of a track hoe say Hitachi400.

  
Fleng
17:33:44 Mon
Mar 12 2012

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Lots of good ideas

dredger-
I like the idea of pressure sealing the joint bearings of the shovel from seawater. Probably need to do the same thing for the hydraulics or I'm never going to get an environmental permit. I'm going to try and fabricate something in the garage that I can test in the creek and work down to 30 feet.
[1 edits; Last edit by Fleng at 19:46:26 Tue Aug 21 2012]

  
Fleng
19:53:08 Tue
Aug 21 2012

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Re: Lots of good ideas

I came across some plans to build a backhoe for $2500. Hope to incorporate some of the suggestions into a submercible version.

http://www.millerwelds.com/resources/communities/mboard/showthread.php?130-My-Homemade-Backhoe


  
thegoldgopher
17:53:14 Wed
Aug 22 2012

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Re: Thinking of designing a high-tech dredge head for use in Nome

Am working on patented concept that may apply to your project. I can be contacted at thegoldgopher@gmail.com

Please contact if interested.

Steve

  
jcazgoldchaser
08:51:25 Thu
Aug 30 2012

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Re: Thinking of designing a high-tech dredge head for use in Nome


  
Diamond_digger
20:36:46 Sun
Oct 21 2012

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Re: Thinking of designing a high-tech dredge head for use in Nome

Hi,
I was playing around with the same idea but just a cutter head is not going to do it.
The way I see it there is two options. A cutter head connected to a large suction hose 15 odd inches wide the cutter head must be mounted on either a crawler or a very large hydraulic arm.
On the barge you will have to put a serious trommel/classifier on as a first stage reception unit for the gravel with the big stones being sucked up.
Then you have to move the gravel on a conveyor belt to the standard wash plant.
However in order for the unit to work in winter time it must be fitted with tracks as well as hydraulic movable flotation pontoons. So that the pontoons can be moved out of the way so that the unit becomes a crawler and can move around on the ice. The cutter can then cut through the ice as you go and mine.
It is an idea lol will surely be expensive!
My 2p's worth barring inflation
Andy
(Lets face it, it would be one heck of a machine)

  

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