"Operating costs for a magnetite mine $90+ per tonne." Iron road have released details that cost of production is US$37.00 a tonne for the CEIP. Combine this with earning a premium price due to its excellent quality and you can figure out the math.
http://www.adelaidenow.com.au/busin...l/news-story/409e979e0cd53532ec698e9317aa0fdf