When the Barclays opened, Carter christened its rusted steel with a string of sold-out concerts that felt less like an unveiling than a homecoming.

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Sonically, this treatment of America comes across via a grouping of pedal steel guitars (instead of the usual string section), banging titanium and steel sculptures, and organizing "a who's who of drummers" in a 12-member drum circle, including Jason Bonham, Sheila E. and Pharrell Williams.

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But, over the past few days a string of gloomy steel production and iron ore price forecasts has trimmed the share prices of all iron ore miners with the potential for worse to come if the price projections are accurate.

FORBES: Connect

Statistics from the China Iron and Steel Association showed that the biggest steel firms there have returned to profitability, but oversupply and a string of unprofitable months have made it a tough year for the industry.

FORBES: Connect