Take context from the input text and decide on the accurate relationship between 'S11D' and 'iron ore' from the options provided.
Options: product/material produced, operator, owned by, stock exchange

Fortescue could be marginal producer ﻿ UBS analyst Glyn Lawcock told the Financial Review that Fortescue could become the marginal producer of the large iron ore players when S11D starts production.
product/material produced