I'll start. Freddy and Juan almost always improve fine and flour gold capture in placer operations with a specific type of sluice similar to the PopAndSon sluice. It's essentially 3 different sizes of expanded metal (e.g. 1", 3/4", 1/2"), over alternating sections of miner's moss and astroturf, giving different sizes and shapes of gold varying situations where one type of gold might not like one spot, but will like another. When you multiply the numbers out it's 6 different capture surfaces. Variety! This setup builds on the Clarkson study and others, and is now a proven gold getter, significantly raising the capture rates of fine and flour gold even in industrial placer operations. Why miners wouldn't use this system from the beginning is a mystery to me, when the template is so easy to follow (assuming one has capital and can source materials and labour for the build). Anyway, this sluice setup is one major thing I have learned from the show. How about you?

One of the improvements that I saw that I hadn't considered is on one site where they had a transition from a roughing jig to a cleanup jig. Typically they have a pvc or some trough for that transition and what they did on that episode was convert that to a small sluice. More places to catch gold is not a bad thing.

@slatcoau - yes, never hurts to put in an additional sluice in a transition area!