everyone will tell you a small one will drop gold out the back but if you build it right then it wont. this cost around $30 and will get you some good gold if you know where to look.
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Step 1: The Metal
we used a 24X12" peace of aluminim (i know i spelled that wrong) bent it to have 3" walls so its a 24X6" sluice
Step 2: Ribbed Matting
at your local gold prospecting shop or online you can find this for cheap. we got a 8x8" peice for $4 and cut it down to 3X6 and glued it 4" from the front. and it needs to be RIBBED matting
Step 3: The Grating
dont know what this stuff is called but its made of steel and if you dont paint it, it will rust. this peice goes over the 17x6 ribbed carpet which is also 17X6 which we are gonna talk about next
Step 4: Ribbed Carpet.
this is gonna catch all the small gold your mat wont. we covered what size it is in the last step. We will cover drilling holes to hold it all in, in a bit just hang in there
Step 5: Holes and Holding It All in Place
the grating has holes in i so dont worry about that. i used a soldering iron to punch a hole 4 1/2 from the front of the carpet if you dont have one you can heat up a screw driver and punch the hole.drill a 1/4" hole in the steel 11 1/2" from the front of the sluice and use a 1/4 " bolt wing nut and 2 washers to hold it in place
Step 6: SAFETY
use rv liner on the top edges to keep yourself from cutting your finger (like i did)
Step 7: NOW GO GIT SOM GOLD!!!
use it like a normal sluice and you will be cleaning out gold every time. the only pic i can tag with this is the gold but if i remember i will post pics tomorrow of it in use since im going tomorrow