Hindalco extracts precious metals from its precious metals refinery at Dahej. Hindalco pays for the gold and silver content based on the prevailing international bullion market prices and other factors.
Gold and silver have an affinity to copper ore and are found in certain quantities in the concentrate supplies. The precious metals are extracted after copper refining to produce 99.9 per cent pure gold, silver and selenium. The residue contains traces of platinum and palladium, which are sold as platinum group metal mix, commonly known as PGM.