Utilize the input text as a context reference, choose the right relationship between Oz Minerals and copper from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Oz Minerals is hunting for acquisitions following its strongest quarterly copper production result in five years.

Answer: product_or_material_produced