Before I sat here and typed for a while I figured I better try my hand at attaching photos.
So here is my test.
This is a picture of where I finally found gold. If it shows up.
Wow... That does look like a natural sluice. Well spotted. Finding something on the order of what you did, would flare my gold fever sideways! I need to go out and do some camping before the Texas heat really sets in. 102+ In July makes even the streams feel like bath water.