It is the second multi-billion charge announced this year, mostly related to its recently launched Minas Rio iron ore mine in Brazil, which has been plagued by delays and cost overruns since Anglo bought it in 2007-2008 for about $5.5 billion.
In the context of the input sentence, determine the relationship between 'Minas Rio' and 'iron ore'.
Options: manufacturer, position held, operator, product/material produced