black sand gold separator south africa
gold and black sand separator price. Gold Prospecting Bob Grove. Black sand concentrates are a combination of hematite, Fe3O3 (SG 526) and magnetite Fe304 (SG 520); gold has a specific gravity of 193, making it easily recovered from the concentrate Start by classifying the concentrate through a 10 mesh screen and run it through a spiral gold wheel, then through a 40 mesh screen, and rerun again