vacre,Zircon is a bulk material sold on a contract basis so...

vacre,
Zircon is a bulk material sold on a contract basis so details often both discontinuous and somewhat opaque.

That said Iluka Resources is the dominant producer and due to reouares likely to be the dominant Zircon price maker in the future i.e. They switch on an off capacity to try to prevent oversupply.
The link below is a Nov company brifing with the general data you seek and suitable commnets on outlook.

http://www.iluka.com/docs/default-source/company-presentations/investor-presentation-by-robert-porter-gm-investor-relations-november-2013

If I may be so bold as to suggest a conservative $1,200 price ZrSiO4. But please do your own research ans ht eissue is complex regarding predictions that's what analysts are for : CitiSmith Barney and Pattersons are two of them.

Other Co's. websits with presentation detials on the zircon price include Alkane (ALK) and Gunson (GUN) via the Cockburn project.