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Agent_34
17:43:44 Tue
Jul 27 2010

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Keene 4" Sluice Box Question

Hi,

I recently purchased a 4" flare from Keene for a dredge project I am working on. I plan to build a sluice box for the flare, but I am not sure what the inside width dimension should be. I know it is nominally 16". However, the dimensions of the flare vary and I am not sure exactly how wide to make the sluice. The rubber damper is 16" but the flare itself is significantly less than that in some places. Does anyone know how wide the sluice box inside width dimension should be?


  
bob_thomas
21:57:28 Tue
Jul 27 2010

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Re: Keene 4" Sluice Box Question

The inside measurement of the Keene 4" sluice box is exactly 16" and the flare fits inside the sluice. So, build your box 16" and you will have a good fit.

  
Agent_34
01:32:19 Wed
Jul 28 2010

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Re: Keene 4" Sluice Box Question

That makes sense since the rubber damper is 16" in width. Apparently there is enough flex in the flare to accommodate the wider dimension.

Thanks for the reply.

  
dredger
02:30:43 Wed
Jul 28 2010

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Re: Keene 4" Sluice Box Question

Hey Agent-34,

Just a thought here, and that is a standard width box, can be either too small,or too big, if the jet, pump, motor, hoses, are either inefficient or really efficient,

My point is that you are building a dredge, and if by chance you buy or have a really good motor and pump, more GPM/ Hp, you may flood the standard width box,

I would suggest before you actually build the sluice, you could list / post what jet, hoses and sizes, pump and motor, ( GPM,Hp,),and are you going to add a under or side sluice box/s, that take water volume from the center 16" wide sluice,

Discussion will help the new guys who are building a dredge, understand there are many variables in "tuning " ,that will cause your first dredge to not work or suck very well, and many hours of wondering and learning why,and actually getting it fixed, which is lost Gold getting time,that's from personal experience.
:devil:

:welcome: to the forum both of yous,, hope we can all help each other,.

  
Agent_34
19:10:15 Thu
Jul 29 2010

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Re: Keene 4" Sluice Box Question

Dredger,

Thanks for the comment.

My set-up will be stock parts for the most part. Two parts that will not be stock are the frame and the sluice box/riffles. I still have to fabricate the frame and riffles. I hope to talk to Holiday Parks today about making the sluice box itself. I have one of the new 4" Keene "oversize" flares. I have not yet purchased the "oversize" jet log that attaches to it. Keene's new oversize system seems like a good improvement (but significantly more expensive).

I don't think I will have a problem with over loading the box. I have a 5 HP Briggs with a 2" Keene pump. If anything, I may not have enough water/power for the riffles and design I intend to use.
I am impressed with the research that went into the report on Yukon gold recovery that can be found here.

http://ygsftp.gov.yk.ca/publications//tech/placerrecovery.pdf

A while back I posted some questions on the potential for using that research in dredges. I didnít get much response. It appears to me that the typical dredge riffle system could benefit from this research. To use the Hungarian riffles recommended in that report requires a 3Ē per foot slope and a specific minimum water flow rate per foot of width. The expanded metal is supposed to be a shallower grade and lower flow rate. My box will not be able to follow all the recommendations exactly, but I am using those ideas for my basis of design.

For the sluice box I intend to make it a single stage box. I will probably have a screen over the first part of the box to classify the material landing on the upper portion. My plan at this point is to have expanded metal over minerís moss for the first one or two feet and then have Hungarian riffles over miner's moss for the rest. Overall length is planned to be 4.5 feet. At 3 inches per foot drop I will have to accommodate a drop (slurry lift) of 13.5Ē from one end of the box to the other. I have the old style yellow floats so I think I have more floatation than the modern mini-dredge floats. I would like to make it work if I can. For the upper part under the expanded metal I may try a sheet metal insert under the riffle to change the slope to about 1.5Ē/foot before the flow enters the Hungarian riffles. To get the correct flow for the Hungarian riffle I may need to gate down the width of the box after the expanded metal. Building my own frame allows me the flexibility of putting the various parts where I want them to achieve the best balance and fit.
I have several concerns with this plan and I donít know how well it will work. If all the fancy stuff fails I can always go to a single stage box that is shorter in length.

I got into this project thinking I was making a wise financial decision. Without going into the details, I'm not sure that is the case. For anyone interested in getting a dredge, it may be wiser to watch the classifieds for a good deal. However, like I said before, I am not very impressed with the Keene riffle designs I have seen (judging from that report), so I am glad I have the opportunity to try something new.

  

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