Abstract: A portable concentrator is described for separating particulates such as valuable metals and gems that will separate from other material due to differential in specific gravity. The concentrator makes use of an upwardly open bowl. The bowl is removable from its mounting frame and is rotated by frictional engagement with a rotatable wheel. The bowl receives a slurry mixture and spreads it radially toward its upwardly inclined side walls. A removable pan is positioned in the bottom of the bowl to initially receive the slurry mixture. The pan includes a convex surface for directing received particulates radially outward to an annular pocket formed between the bottom wall of the pan and an annular flange member. Heavy particulate gathers in the pocket. The lighter tailings migrate up the wall of the bowl and over its edge. The tailings are received within a spillway of the housing that encircles the bowl and is drained off onto an elongated riffle plate.