Sluice design Options

[Davem]

I want to build a sluice box from wood materials. I read one book that used 1 1/2 high riffles (1x2) set 1 1/2" apart. BUT I see all these designs on the internet or commercially made styles where the riffles are set maybe 6" apart. If the wider riffle spacing because expanded metal and carpet is used? I'm not sure what size riffles to use and how far aprt to set them? Thanks for any help.

[fenixsmom]

Can you weld? Aluminum sheets are cheap. at any rate I've seen them seperated every 6" for a 3' long box. Look up the Keene A52 and reproduce the slat design. I highly recommend deep V black matting, miners moss and corrugated metal to also help catch the fine flakes.