I'm sure we lost some micron gold out the back, but from the test I think very little gold was lost. We panned out the concentrates and found only 4-5 small pieces of flour gold in the second sluice with 90-95% in the top box. I don't know if it was from less slope, the different material, or another factor. When we did cleanup I noticed that the second sluice caught a whole bunch of black sand and a lot more garnets than the first sluice. I would guess that we ran maybe 15-20 3/4 filled 5 gallon buckets through for the test. We rigged up another A52 to the end with a more shallow slope and the stock riffles, carpet and no expanded metal. Eventually I will have ribbed v-matting under the moss and then I will do tests with and without the expanded metal. I used the stock riffles and took out the expanded metal because it would not fit. I have my unbacked miners moss and green miners carpet under to catch the fines that sink though the moss. My buddy and I did a test last week to see how much small gold we are losing. I also like the way you made those brackets so your sluice sits low on the frame. I was going to do something similar and then attach some angle aluminum at the edges so I could throw small nuts and bolts back there if needed without worrying about them falling off, but I found out that my panning tub fits in between my frame in the back just right. Looks like you have a ton of space back there. I used angle metal on my sides so the barrels fit real tight, but they stick up above the frame making it harder to attach a shelf for the misc gear. I like the fact that you made the frame out of box aluminum so that back shelf sits above the barrels. I am going to bring mine in to a shop and have the corners and other stress points welded before dredge season because I can only put so much faith in pop rivets. I wish I knew how to weld aluminum like you.
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