I tested cube tailings and im losing gold. Im sure a partial reason is the large amount of lead and lead like heavy metal ore. Theres gold down the cube in the matting not where expected and the lead heavy stuff is engulfing the best catchment area.
I thought about this as a solution. Using a magnetised bed what my material slides into hopefully trapping the heavy lead. The rest of the lighter material flows or rolls over the magnetite/iron filing magnetised bed.
The flow rate for a magnetised sluice ive seen is the same as the cube.
Then i thought if i can play it smart enough and use the correct strength magnets and shapes i can manipulate the geometry of the bed and create a concentric geometric pattern with varying density levels of filings.
So throughout the bed theres pockets of low resistance material can fall into as it flows.
If i get the magnet size and strength reasonably close the system should be forgiving in that magnetics will build up and clear at a certain point without actually clogging the system and density and gravity favouring gold as well as lead i should trap both well size been not a bad thing
So at the worst i trap the lead and keep my cube clean.
i cant find any good information yet on magnets best size and shape. Quadrapolar positioning of rectangular magnets leaves a square hole or theres ring magnets of varying hole width. There wont be any actual hole though its more a moving fluid carpet of iron filings or oxides etc with high and low density pockets of resistance.
Il buy some n42 and n50 neodynium magnets in a few days but id welcome any information what helps determining size strength and shape to get in the meantime. Enough for a 12x12inch tray.
Ive one pattern in mind whats called halbach array. The link shows a 2 dimensional pattern of flux field. Stacked side by side itd create the low density pockets https://en.m.wikipedia.org/wiki/Halbach_array
the magnets here are cubes in line and can be added to indefinately
. The next line slightly offset and so on.
Id probably sink the cubes in plasticine and put a plastic sheet over to test. It means the sluice bed is level and its easy to swop and change configurations and manipulate magnetic field strength