Separation of minerals in jigging machines is based on the fact that particles will stratify in pulsating water. The upward and downward currents fluidize and compact the grains into relatively homogenous layers. Low density pieces stratify on the surface, while specifically heavy grains settle to the lower level of the bed. Depending on the application and the feed particle size, the discharge is realized by means of a movable bed, bottom gate, star gate or vibrating feeder discharge.
