A large architectural complexes of South America located in the Lambayeque valley of north coastal Peru. The site has more than 30 huge platform mounds with an estimated 750,000 burials - most of them looted by treasure hunters who have taken immense quantities of gold, silver, copper, and bronze objects. Occupation at Batán Grande went from the Formative (Cupisnique) to the Inca period. The site was the capital of a powerful state between 850-1300 AD. With Batán Grande, Cerro de los Cementerios was a copper-processing area, linked to the Cerro Blanco mine by a prehistoric road. Excavations have revealed metal artifacts, smelting furnaces, grinding slabs, crushed slag, and pottery blowtubes.