If I read this right, that's $900M for a 16.5% stake in a mine with a 35MTA production rate.
Well, 2 jap firms paid $1.5B for a 15% stake in BHP's Jimblebar (also a 35MTA mine not yet in production).
http://www.miningaustralia.com.au/news/bhp-selling-iron-ore-stake-for-$1-5b