Feed is screened at approximately 2-4 mm depending on the application, introduced as slurry through the ultrafine vertical mill feed pipe, and accelerated by the rotor.

Rapid stratification according to specific gravity occurs as the material is driven up the grid concentrate cone wall under the influence of an immense gravity field.Fluidization water is injected through the rotor wall to create a dilated or fluidized bed.

The high specific gravity gold or other target particles become embedded in this zone and are retained here until the machine is stopped and the concentrate is rinsed down through the concentrate discharge ports.

A centrally located rinse manifold directs jets of water to thoroughly rinse concentrate from the retention zone after each operating cycle.