In the context of the input sentence, determine the relationship between 'Chuquicamata' and 'copper'.
Options: product/material produced, developer, distribution format, director/manager

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