Riffle Efficiency

Hi Everyone,

I was wondering if anyone would give their opinions on a concern I have about dust gold recovery through the use of riffles.
I have read many therioes and reports stating that sluices have a high recovery rate of gold recovery.

However, some miners I know seem to believe and think that dust gold recovery through the use of riffles are very difficult and near enough not productive.

Although, through my research and study, I have fallen under the idea that if we have our riffles calibrated correctly, and working efficiently that should enable us to extract the dust particles of gold out of our slurry running down our sluice, and even in some cases a rate of recovery of up to 90%.

Is that true.. or better yet what are your thoughts.

Thanks for the help guys.

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thanks a lot

Posted on: September 02, 2012, 04:09:54 PM

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Well for a our secondary classification system we plan on using a spiral helix to retrive and extract the heavies from our gold.

i guess i was looking for and wondering whether if the riffles were done correctly they would indeed manage to work efficiently and extract the gold into our miners moss, as i started to hear mixed thoughts, which made me wonder!

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What is wrong with miners moss? I thought miners moss would be the best matting to use? Additionally, we have riffles over them...
We also have a section of astro turff before hand?

This is for our intial classification of our payload material that will run off from our trommel.

What would you suggest to use instead of miners moss or astro turff... From my research I thought that that was perhaps the best system to use.
Or do you have some good advice that could aid me in my process?

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yes the first run of material.

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MIners moss is ok compared to Vortex matting but with both there is clean up, with miners moss your clean up is not as often  but will trap gold dust with the black sands. Vortex matting needs to be cleaned up more often but is easier to clean. Vortex matting catches larger flake gold better. If your dealing just with gold dust then you need a shaker table as nothing else will work very efficiently at separating the black sand from the gold. If your intent is just catching gold dust you dont need riffles just run a slick plate with either miners moss or vortex matting and clean up regulary. If you have larger flake gold mixed in then run a slick plate with no riffles in the first 4 feet then use your miners moss to trap the black sands and flour gold.
I built my own reclaiming stackable sluice with a 1000gph bilge pump I got from some company on-line, I forget which, Marine something or another, Spent a week testing my set up every way possible, using 2 ft trays 4 stacked high and found that the back side of any V-matting with NO riffles caught more flake size gold and washed out the black sands and just used a snuffer bottle to pick up the gold, in the last tray I ran Vortex matting but again without a shaker table to separate the gold dust from the black sand its impossible to separate efficiently. It was a very time consuming process and in the end not worth it. A shaker table would have made this profitable for sure because where I am the gold is all dust mainly, have heard of where to find the larger gold from an Oldtimmer but have yet to try his secrets he shared, maybe in the spring I can go back again. Can you guess my winter project is going to be ?       A Shaker Table !!!!!!

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