R. G. Sandberg

• Recovery of silver, gold, and lead from a complex sulfide ore using ferric chloride, thiourea, and brine leach solutions
• Calcium sulfide precipitation of mercury during cyanide leaching of gold ores
• Cobalt and nickel removal from zinc sulfate electrolyte by solvent extraction and precipitation techniques
• Oxidative sulfuric acid leaching of lead smelter mattes