Welcome to T-Net Longtime,
The Gold Cube works excellent on the glacial gold found here in our part of the country and experts at panning have no trouble panning the super cons that the cube produces. Personally I like using a Miller Table to run my cons and usually wait to do that at home at night or when the weather wont permit me to go prospecting.
I try and collect all the cons I can when at the creek and not waste time panning other than to test pan looking for pay streaks.
Here in Indiana pickers are hard to come by and we set up our equipment for catching fine gold trying our best to get every fly poop speck we can, pickers are a bonus.
I've found that fluid bed technology is a real asset when trying not to loose the fine and flour gold. So I have designed my own equipment around that concept. Here is an example of what I call a super fluid bed gold trap highbanker whereby I use a 3" suction nozzle to dredge into.
View attachment 999074
The fine and flour gold sinks and gets trapped in the bottom while only the lighter material flows over the gate at the end of the trap. The fluidizing tubes in the trap keeps the material in a fluid state which is what allows the heavies to settle to the bottom.
Also as Reed suggested, classification is key, you don't want the larger gravels knocking the smaller gold loose in the sluice. Here In Indiana classifying the material down to 1/4" is normal.
Set your sluice up for glacial gold. No riffles! If you are using miners moss be sure to put deep V mat underneath it. You can put raised expanded metal over the moss to hold it in place. Make sure it lays tight against the moss. Set the sluice up at a 1" to the foot angle and keep the flow fast enough that the gravels keep moving down the sluice at a medium pace.
I recommend using vortex mat alone instead of miners moss and deep V but some will run only deep V and nothing else, but they classify to 1/8".
Vortex mat is great at exchanging out the black and blonde sand for gold, and you will be surprised at the tiny micro gold that you will recover with it as well as the pickers. When using Vortex mat the magic angle is 15 degrees (3" to the foot) Vortex mat is what is used in the Gold Cube.
Hope this helps,
Go for the Gold
GG~