RE: Harena Resources: Ampasindava Confirms High Recoveries of Critical Magnet Metals16 Apr 2025 11:57
16th Apr 2025 7:30 am RNS High Recoveries of Critical Magnet Metals
"Ampasindava Confirms High Recoveries of Critical Magnet Metals via Low-Impact Heap Leach Processing
Harena (LSE:HREE) is pleased to report metallurgical test results from its 75% owned Ampasindava Rare Earths Project in Madagascar. The work confirms that ionic clay-hosted rare earth elements (REEs) from Ampasindava - including the strategically critical magnet metals Neodymium (Nd), Praseodymium (Pr), Dysprosium (Dy) and Terbium (Tb) - can be recovered efficiently using low-impact heap leach processes such as salt water or standard ammonium sulphate solutions.
This result supports the Company's goal of developing a technically robust, environmentally responsible, and geopolitically independent supply of magnet metals essential to the global defence, energy, and technology sectors.
Highlights:
• REEs at Ampasindava are readily recoverable through simple ion desorption, with high extraction rates achieved using a ammonium sulphate leach in low-acid conditions.
• Main extractions were approximately 88% Nd, 73% Dy, 67% Y, 86% La, with low levels of gangue, thorium (Th) and uranium (U) supporting a clean environmental profile.
• SGS Lakefield testwork using a pH 5 ammonium sulphate solution delivered strong results, including 87% Nd, 88% Pr, 71% Dy, 75% Tb and 63% Y
• Encouragingly optimal column heap leach test, over 218 hours, demonstrated recoveries of 88% Nd, 86% Pr, 73% Dy, 79% Tb and 67% Y using Ammonium Sulphate at a pH of 4.
• Low value/high bulk Cerium demonstrated minimal recovery, a significant benefit in production of a high-grade magnet metal concentrates or carbonates.
Joe Belladonna, Managing Director, commented:
"While early days in the programme the high rare earth recovery results achieved in the SGS Lakefield test work are very encouraging. This demonstrates that the process to be employed at Ampasindava will be environmentally and ecologically friendly. Furthermore, the low-risk process, simple reagents utilised and no requirement for a tailing storage facility should benefit the economic and technical viability of Ampasindava."
"With the current geopolitical environment, the race to secure heavy rare earth feed stocks for defence and new energy applications is accelerating. Projects that can demonstrate both technical viability and alignment with Western supply chain priorities are increasingly in focus. Ampasindava's combination of critical magnet metals, clean extraction, and independence from Chinese processing gives us a timely opportunity to contribute to a more resilient global supply chain." ..."
https://www.lse.co.uk/rns/HREE/high-recoveries-of-critical-magnet-metals-rnhpp5w1sc5l6yn.html