Read page 17 of the Teck 4Q 2017 news release and find out why QBII hasn't been sanctioned, yet:

 Project activities during the quarter focused primarily on execution readiness activities, advancing detailed engineering and design, and continuing progress on the Social and Environmental Impact Assessment (SEIA) regulatory approval process. A decision to proceed with development will be contingent upon regulatory approvals and market conditions, among other considerations. Given the timeline of the regulatory approval process, such a decision is not expected before the second half of 2018. Work activities continue to focus on completing the regulatory approval process and advancing detailed engineering, early procurement contracts and construction planning to ready the project for execution. Project development expenditures for the first four months of 2018 are anticipated to be approximately US$100 million. 

They are ready to pull the trigger on QBII when they get the SEIA permit. None of these activities have occurred at SC and now we're waiting to see if the desktop studies indicate a mine at SC might meet Teck's economic thresholds.