The angus mackirk sluice's do great on flour gold and the stuff here is glacial gold, they make a lot of different ones as no one sluice will fit all needs, what kind of water flow will you be using it in? Will there be times in the summer when the water is lower and not flowing much? It's probably best to have a couple sluice's to fit different conditions, unless there's always good water flow and your always on the same creek or river. I have a power sluice to use in some of the creeks around my area as in the summer sometimes there's no flow at all but there is holes that hold water that I can use with my power sluice with a pump. I have three sluice's now two are the angus mackirk sluice's, the grub steak is great for really small creeks with very low flow and is a great sluice to test an area before setting up a bigger sluice or the power sluice.