Utilize the input text as a context reference, choose the right relationship between South32 and manganese 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.

The USD1.9 billion of impairments largely counterbalances an earlier assessment increase on the Australian and South African manganese businesses of USD2.1 billion, South32 said in a corporate statement.

Answer: product_or_material_produced