The elephant in the room is all about why Teck did not pursue the project as described in the 2013 FS. I know from working on multi-billion $ resource projects that proposing to spend $ 3.2 billion in capital for a limited life(only 21 years) project with a post tax IRR of 8% is not a particularly good business decision, especially when you have other projects with much better economics(see QB2 numbers). There's a reason they've been looking at smaller sizing for SC, running deskstop and conceptual studies and not announcing a development plan for SC for 6 years now. The answer is contained in the satellite asset description which states the objective of the conceptual study is to"significantly improve project economics".  The SC project is being reworked by Teck to try and produce something worth developing according to their metrics. Apparently they are close to getting there.