Two Nordic mining companies at the heart of Europe's push to achieve resource security are taking novel — albeit very different — approaches. One is pursuing the concept of an "invisible mine," while the other is taking on one of the world's most radical relocation projects.

It forms part of a strategic shift for the European Union. Under its forthcoming " RESourceEU " initiative, the 27-nation bloc intends to step up its efforts to secure access to domestic sources of critical raw materials in both the short- and long-term.

The plan, which intends to boost investment in strategic projects, is designed to help break China's long-held mineral dominance .

Alf Reistad, CEO of mining firm Rare Earths Norway, told CNBC that there's been a clear shift in terms of how both domestic and E

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