Utilize the input text as a context reference, choose the right relationship between Roy Hill and iron ore 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 ramp up of Roy Hill is likely to be key to the iron ore market over the remainder of 2015 and into early 2016 as it represents the biggest increase over that period until Vale's S11D completes in late 2016, early 2017," Lawcock says.

Answer: product_or_material_produced