Ann: Updated Definitive Feasibility Study Completion Date, page-54

Considering the Christmas and New Year shutdown, most companies back to work from the 7th Jan 19. It would take them up to 2-4 weeks for final review and approval.
End of Jan or early Feb is high likely. Follow by the release of the activities and quarter reports.
For the past records delaying up to 4 weeks is not surprising for this company.
Having said that, they will release it and hopefully other key milestones will follow.
MOU from Fulin Group would kick off the new year or any good announcement relating to Codelco