Well after sluicing roughly 11 12 buckets 3/4 full we found very little. surprised at how little black sand we found also. We dug next to a shale rock wall broke off lots of the shale to find a lot of material trapped in the cracks. we dug down aprox 3 feet and 6 feet or so along the shale wall thought that we would have found more than 3 or 4 micro pieces in our cons. Oh well next time still need to mess with the sluice set up to fine tune material was rolling thru ok classified to 1/2 inch.