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 has recorded its strongest quarter of copper production in five years as it shifts focus toward the …

Answer: product_or_material_produced