Managed to get away down to the creek today and do a test, so here are some results.
First, here is a video showing me feeding it a bucket of unclassified dirt and how it copes with it:http://www.youtube.com/watch?v=_dhYl5lIO9M
The inbuilt classifier works really well, and a bucket can be emptied into the sluice fairly quickly.
This second video shows me panning the concentrates http://www.youtube.com/watch?v=OF6waDSRWhw
Can feed it quickly
The trap works
Cheap and easy to make
The brazing rod grizzly works brilliantly
Clean up is simple, just put it upright into a bucket and move it around
The PVC pipes in the trap work well to keep the concentrates in suspension
What needs improving:
19mm timber floats too much and takes up too much room
Remember solid timber swells across the grain when wet, so account for that.
It requires a good flow of water
Bottom line is that this system works. The light material washes straight off the sluice, > 6mm stones also washes off and heavy material gets into the trap and stays there. < 6mm stones eventually wash out of the trap leaving black sand- awesome.
I really like how it all fits together and can't wait to get the real thing. I am actually considering learning plastic and bending to make a better prototype and maybe even some improvements.
I had a goal this week to find a gram of gold, not really knowing anything about where to go in Adelaide. I didn't make it but gave it a damn good shot.
Here is the result