PULSATING JIG

A method of pulsed shaking which allows heavier minerals to settle. The basic modern jig is a mechanized form of this operation employing an open tank filled with water, with a horizontal metal or rubber screen at the top and a spigot at the bottom for removal of heavy material concentrates. The screen holds a layer of Coarse, heavy material referred to as ragging - steel shot is often used for this purpose.

Ragging functions as a filtering or separating layer for heavy particles. The feed forms a sand bed on top of the ragging which aids mineral separation. The ragging and the sand bed together are referred to as the jig bed. Mechanical plungers inside the tank cause the water to pulsate up and down.