http://yahoo.brand.edgar-online.com/EFX_dll/EDGARpro.dll?FetchFilingHTML1?ID=7671217&SessionID=ADoWHC9Jmyc0kA7
The above link includes the Intrepid 2011 Investor Presentation. It's a good reference if TRH get the chance to develop the Utah Potash project.
There is plenty of information regarding Potash costs and the new project in Carlsbad.