Separating Copper From Gold

Separating Copper from Gold (electroplating) - Pyrometallurgy: Roasting, Smelting, Refining & Calcining + Electrowinning - Metallurgist & Mineral Processing Engineer. I am currently separating and extracting gold from margin ore dump (Mod) using the following processes: leaching, carbon in pulp, elution (zadra process) and electro winning. My final product (sludge gold) is contaminated with excessive copper.