Take context from the input text and decide on the accurate relationship between 'Chuquicamata' and 'copper' from the options provided.
Options: developer, distribution format, director/manager, product/material produced

The Chuquicamata mine, located 1,650 kilometers (1,000 miles) north of Santiago, produces around 339,000 tonnes of copper per year, making it one of the company's most productive sites.
product/material produced