Wadi Rahjan Monzogranite Reveals REE-Rich Allanite and Bastnäsite in Saudi Arabia

Highlights

• Ferriallanite-(Ce) contains 22.73–30.19 wt% LREE+Y oxides, while hydrothermal bastnäsite reaches up to 70.72 wt% REE oxides at Wadi Rahjan.
• Hydrothermal alteration by fluorine- and CO₂-bearing fluids roughly doubled REE-oxide concentration from allanite precursor to bastnäsite product.
• The study lacks bulk-rock TREO grade, deposit tonnage, metallurgy, and resource definition—key data needed before any economic assessment.
• Next steps require systematic drilling, bulk assays, mineral-resource definition, and beneficiation testing to determine if mineralogy scales to recoverable tonnes.