Abstract: A sluice comprising a series of sequential, interconnected chutes, each inverting a stratified slurry, discharges the slurry in each chute over a mesh screen in a subsequent chute and eventually out of the sluice, with each incremental stage designed to treat smaller matter. An array of cones is disposed on each chute bottom over which the slurry passes, each cone in the array having an opening oriented downwater and including a ridge over-hanging its opening also oriented downwater, such that heavy matter settling from the mineral matrix is drawn into the cone. Below the cone array is a perforated mat. Also below the array, beginning at the minor's moss mat and extending downwater, is a textured mat, typically with upstanding ribs transverse to the chute water flow that also tends to capture settling material.

Abstract: A traditional gold pan 10 with a flat center base 11 with a spiral sidewall guide 20 from a vertical pan rim 13 to the pan base 11 incorporates a plurality of obtuse flukes 30 on the spiral extending into the spiral path to disrupt smooth flow of water and mineral matter. A spiralling guide is also provided on the base 11 leading to a cup 60 at the pan center. On the spiralling base guide 40 is a plurality of stratifiers extending from the guide base 40 into an outer spiral path. The pan is continuously rotated by an electric motor linked to the back of the by a belt and pulley.