When ‘immobile’ metals move

In many geological systems, niobium and zirconium are treated as relatively stable markers. They do not usually move easily through fluids. At the Motzfeldt Project in South Greenland, the latest Merino results point to a more unusual geological setting.

The mineralisation occurs in metre-scale hydrothermal vein structures, where rare earth elements, niobium and zirconium appear to be linked to fluid pathways through the rock. The data suggests that hot, mineral-rich fluids may have helped move and concentrate metals usually considered less mobile.

A key part of the working model is the exceptional fluorine content of the fluids at Motzfeldt. Fluorine is recognised in academic studies as an effective transporter of niobium and zirconium, while rare earths may also be mobilised where fluorine rich fluids interact with carbonate.

Field observations and previous mineralogical work also indicate the presence of bastnäsite for light rare earths, xenotime for heavy rare earths, columbite for niobium and zircon for zirconium. Drone photography from the 2025 field season adds further context, showing similar dark mineralised structures across the Merino cliff faces, continuing in excess of 150 metres.

From an exploration perspective, these structures may record where metal-bearing fluids moved through the upper part of the Motzfeldt system. This supports the wider geological model, with Motzfeldt defined not only by the known magmatic pyrochlore mineralisation at Aries, but also by hydrothermal critical metal structures at Merino. Next steps include further interpretation of the assay, mineralogical and structural data to support future exploration planning.

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