Gravity concentrators having a round or circular hutch shape generally are considered superior to a standard square cell mineral jig design. Circular jigs (since Norman Cleveland’s 1960 work) have proven to be more efficient than square and rectangular jigs. Some interesting work by CSRIO (Australia) using computational fluid dynamic (CFD) modelling showed that the circular shape of the vessel itself and the central slurry injection point from which slurry disperses in all directions were the most significant features. This is due to a varying flow rate across the jig allowing for a progressively finer separation from the inlet to the discharge.