Large institutional investors believe that iron ore prices are unlikely to drop, even if the world enters a double-dip recession.
The London Metals Index is down just over 20% this year, but iron ore has fallen less than one percent.
In part, this is because the market in iron ore derivatives is relatively young (just over a year old).
http://www.ft.com/cms/s/0/acf87fe6-f350-11e0-b11b-00144feab49a.html