Method and Equipment for Final Concentration of the Gold–Bearing Alluvial Sands
The article describes equipment designed for final concentration of gold–bearing heavy concentrates. Final concentration is performed with a complex dry method: separation in weak and strong magnetic fields to remove metal inclusions and weakly magnetic minerals from the heavy concentrates, followed by separation of non–magnetic minerals in a magnetic fluid according to their density. This method of final concentration of the gold–bearing concentrates allows to successfully replace the amalgamation process used at present. In one application the final concentrate with the grade of 452 kg Au/tonne, and with the recovery of 95.5% was obtain from the black sand assaying 473 g Au/tonne.