The Arvidsjaur district is represented by Jerferälven, an early-stage project focusing on zirconium, yttrium, uranium and rare earth elements.

Geologically, interest in the project is based on mineralised boulders and historical investigations of Zr-Y-U-bearing material. Previous technical documentation describes boulders containing zircon, fluorite, hematite, quartz and REE minerals such as kainosite-(Y) and bastnäsite-(Ce). The central exploration question is whether the boulder material can be traced back to a local or regional bedrock source.

Crustal's exploration model in Arvidsjaur is therefore based on classic boulder tracing combined with modern field verification. Through radiometric mapping, pXRF, gamma spectrometer, biogeochemistry and till geochemistry, the company can systematically test the direction, dispersion patterns and potential source areas of the identified mineralisation.