What is the relationship between South32 and silver in the context of the input sentence. Choose an answer from: 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.

The 6.28 million ounces of silver produced in the quarter puts South32 well ahead of the pace required to achieve full year guidance of 21.65 million ounces, but South32 cautioned that the strong performance was likely to be temporary.

Answer: product_or_material_produced