Extracting Gold from Rock Containing Multiple Minerals — Step-by-Step Lab Experiment.

Extracting Gold from Rock Containing Multiple Minerals — Step-by-Step Lab Experiment. • Ore (Au, Ir, Co, Ni) • Crushing & Grinding (Break the rock into fine powder) • Gravity Separation (Separate heavy minerals like gold and iridium) • Roasting & Acid Leaching (Roast the concentrate and leach with acid to dissolve cobalt and nickel) • Result: • Co, Ni Residues (in solution) • Heavy minerals (Au, Ir) remain 6. Gold extraction: • Smelting with borax, or • Dissolving with HCl + Bleach, then precipitating 7. Iridium: remains solid or can be smelted at high temperature