Heavy REEs Terbium and Dysprosium from Korsnäs

Prospech Limited (ASX: PRS, Prospech or the Company) is pleased to announce further assay results from the ongoing program of sampling and assaying of the historic Korsnäs drill core from holes completed in the 1950s, 60s and early 70s.

A total of 307 samples from 25 holes are reported.

• Further impressive assay results received from 307 samples, 25 historical drill holes
• Assays include heavy REEs (Terbium (Tb) and Dysprosium (Dy)) results up to 86 ppm and 313.4 ppm respectively
• Numerous high grade and broad REE intersections are reported, such as:
  • KR-272: 11.4m @ 13,383 ppm TREO¹ from 102.7 (NdPrO² 3,982 ppm)
    Including4.0m @ 32,831 ppm TREO from 106.7m
    (40.9 ppm Tb4O7; 227.4 ppm Dy₂O₃; 9,943 ppm NdPrO)
  • SO-187: 17.4m @ 9,798 ppm TREO from 0.0m (NdPrO 3,087 ppm)
    Including3.0m @ 48,465 ppm TREO from 11.4m
    (86.0 ppm Tb4O7; 313.4 ppm Dy₂O₃; 15,557 ppm NdPrO)
• The tables of REE Mineralised Zones 1,000 ppm TREO (in the announcement below) detail many more results worthy of attention

Prospech Managing Director, Jason Beckon, commented:

“Korsnäs keeps delivering standout results, with recent recognition of high grade zones rich in critical Heavy Rare Earth Elements (HREEs) like dysprosium (Dy) and terbium (Tb).

While Korsnäs is primarily a carbonatite-associated deposit known for valuable magnet REEs such as neodymium (Nd) and praseodymium (Pr), the presence of significant Dy and Tb mineralisation is a major advantage. These heavy REEs are crucial for producing high strength magnets which hold up under high temperatures and perform reliably in demanding applications like electric vehicles, wind turbines and high-efficiency motors.

With current supply disruptions in China, securing a stable source of these materials is more important than ever. Prospech is looking to meet this need, positioning itself as a dependable future supplier of magnet critical HREEs. Our commitment to thoroughly assessing these enriched zones at Korsnäs reflects our confidence in the project’s potential and our determination to support the growing global demand for sustainable energy technologies. By developing Korsnäs as a secure supply source, we are not just meeting immediate industry needs; we’re playing a key role in strengthening the resilience of global rare earth supply chains for the long term.”

Initially developed as a lead mine, the Korsnäs project also hosts extensive rare earth element (REE) zones, which remain open both along strike and at depth. The site features a series of layered carbonatite zones, each up to 20 metres thick and separated by 50 to 100 metres along the strike. These REE enriched zones correlate with gravity anomalies, represented as orange ellipses on the included plan. So far, five such anomalies have been identified, extending over a strike length of more than 5 kilometres.

Focusing on REE mineralisation, the Company has conducted a comprehensive REE sampling program on the historic Korsnäs core stored by GTK at their data facility. Assay…