Board Thread:Battle Nations Discussion/@comment-107.6.95.18-20130613101614/@comment-4632427-20130613132832

Tier 4 resources can't be acquired through raiding or occupation. You'll have to build your own Refinement Facility to get them.

Widgets and Laurels are also available from defeating the Ancient Construct, which should be possible at your level if you've ranked up your tanks and tank killers enough.