I finally tried out my Bazooka gold trap sluice this last weekend, prospector model. I only had about an hour, so I collected two five gallon buckets and ran them. I was on the Arkansas River around Buena Vista CO. The river is still low, so I was able to collect from exposed riverbed. I only got about 10 course flakes, not bad for just scooping from around rocks quickly. I'm happy so far with the performance of this sluice, hopefully I'll be able to spend more time this weekend putting this thing through it's paces. By the way, you don't need to worry about the bigger, lighter gravel in the trap. As you feed it, the heavy material builds up in the bottom of the trap and slowly pushes the lighter gravel out. Since I didn't run very much last weekend, I had a lot of light gravel in the trap, so an 8 mesh classifier seperated it from the heavies in about 5 seconds.