Thorium and cobalt are separate material choices with different gathering routes. Thorium-bearing sandstone is recorded in Badlands and Desolate Basin; cobalt-bearing slate is recorded in Boreal Reach and The Everfrost, along with several Whisperfrost shore and shallow-ocean records.

Boreal Reach and The Everfrost are the two named inland regions in the Whisperfrost Frontiers release catalog. Cobalt-bearing slate has recorded generation references in both. The Black Wolf has a recorded association with Boreal Reach.