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The Pocket Sluice

Author Topic: Raised Expanded  (Read 3819 times)

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Offline AuTiger

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Raised Expanded
« on: February 04, 2015, 06:07:18 AM »
Could someone please tell me what is the deciding factor when choosing 1/2 or 3/4 expanded? I see both being used, but wonder if there is pros and cons for the different sizes, and why it matters? ???

Offline ryanonthevedder

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Re: Raised Expanded
« Reply #1 on: February 04, 2015, 08:34:43 AM »
The difference is in the size of the vortex that it creates. The larger the profile the bigger the vortex. That goes hand in hand with its ability to exchange out material. A larger vortex has more energy and is able to process material more quickly, but also has the ability to toss out smaller gold. I have seen people go with multiple sizes in their box, but your feed rates and water levels should be tuned to favour the smaller vortex IMO.

Offline sunshine

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Re: Raised Expanded
« Reply #2 on: February 04, 2015, 08:53:15 AM »
Exactly.  Rule of thumb - Smaller sluices or smaller gold -  smaller expanded.  If you had a long sluice, multiple sizes is an option. 
See my YouTube channel for fun amateur video:
https://www.youtube.com/channel/UCnz8kX6AZOeZbRt0F9XqVJA

Offline AuTiger

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Re: Raised Expanded
« Reply #3 on: February 04, 2015, 04:01:27 PM »
 ;D Thanks fellas! Never even thought about a correlation between size of Au and size of Vortex! I now know what I need!  <-good_> I can't believe I had to ask that question!
I'll blame it on using a Drop Riffel Hibanker??

 


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