Teck doesn't fool me.  Schaft Creek is at the completed Bankable Feasibility stage with the 2013 43-101-compliant Feasibility Study. 

Of the very little work that Teck as operator has done on the project since its 2013 option for 75%, none of this work has "unvalidated" the Feasibility Study, imo, and this very little work has only exposed much more positive economics and even more jaw-dropping unsurfaced value.  

Besides, Teck doesn't even need a 3rd-party prepared Feasibility Study, or an update on one, to make a sanction decision.  IIRC, QB2 did not get to the Feasibility Stage before being sanctioned.