Hey Jessgo,
It was our first dredging trip, A friend and I got laid off so we decided to give dredging a go. We did not do our research well and the section of the river we leased turned out to have been flumed and worked to bedrock by the Chinese. In the redding mining museum you will find a picture of a rock with 5 china men still under it ,that was our spot.Our biggest piece was 5 penny weight. and we got about a half ounce. $3000 in costs only $200 in gold but the fun we had PRICELESS!!!
Two spots up from us a pro dredge crew with a 20 ton Keene winch cleaned out 7 and 1/2 pounds for their summer between 5 guys. (keep in mind this was right after the flood) If detecting that area there is tones of bedrock. Been detected allot though.
When sluicing don't be shy about sampling high up on the bank! There are little gravel pockets up in the boulders in places. When we were there there was a 10hp Honda dredge motor 20 feet high and dry stuffed into a crack on the edge. (and I mean stuffed)
The flood of 97 blew stuff everywhere. Water was hitting the bridge on doe mill road!
I want to raft the American this summer stopping at all the bed rock. It would take you days to hike back in there.
Good luck out there!