according to the Globe back in 2014 Cliffs had spent 550 million.
I read in another article it was closer to 750 million.
https://www.theglobeandmail.com/report-on-business/industry-news/energy-and-resources/cliffs-natural-resources-looking-to-exit-ontarios-ring-of-fire/article20651617/
Cliffs bought three chromite deposits in 2010 for $350-million. It spent about $200-million developing the project and had expected to spend about $3-billion in total.
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Noront picked it up for next to nothing and has a market cap of 66.56 million
Cliffs expected to spend 3 billion in total and stated once the mine is open they'll be able to make 750 million a year (an increase of 50% to the revenues they had then)