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Agent_34
01:37:45 Wed
May 19 2010

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Placer gold recovery report dredge application?

I suppose that many of you have already seen this report.

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

This appears to be a very informative report with specific recommendations on how to recover a large percentage of gold. The standard recommendations for optimal gold recovery specify a sluice that is 24 feet long. 16 feet consists of expanded metal riffles and 8 feet consists of angle iron riffles at a steeper grade of 3 in/ft. The angle iron riffles are specified to be no more than one inch high, spaced at two inches, and tilted 15 degrees upstream from sluice vertical.

The dredge sluice boxes I have seen seem to be a caricature of this sluice design. The report makes it pretty clear that many gold recovery methods that miners obviously thought were working were really loosing much gold out the end of the sluice. I have some questions.

1. Could the iron angle riffle design in this report be adapted to a 4’ dredge sluice box? Obviously, it would be less efficient than the 24’ sluice set up as specified, but perhaps it would be much more efficient than what is seen in say the typical Keene sluice box.

2. Wouldn’t the steeper 3 in/ft grade work better at moving large rocks out of the sluice box?

3. Would a dredge be able to produce the required 380 gpm slurry per foot of width? I think a 4” would easily be able to do that judging from a quick calculation I did.

4. Would it be worthwhile to make the sluice a couple feet longer and have a two foot expanded metal section before the angle iron riffles (and have the two different slopes as well)? Would this work to increase fine gold recovery?

  
Geo_Jim
06:44:45 Wed
May 19 2010

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Re: Placer gold recovery report dredge application?

Thanks Agent 34,
I had seen it years ago, but I didnt have a copy of it. Now i do. Thanks for the link.

Are you any relation to Agent 99 or 007?
Geo Jim

  
Agent_34
16:19:57 Wed
May 19 2010

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Re: Placer gold recovery report dredge application?

Nope. Just being random.

  

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