The Ghurayyah deposit is an alkali granite intrusion of Neoproterozoic age, forming a 900m diameter circular outrop. The intrusion is located 85 km SSW of Tabak, in a valley at the junction of the Wadi Sadr and the Wadi Assahtutah. The riebeckite-bearing microgranite hosts numerous pegmatite veins containing rare-element minerals.
It may become the world's single largest deposit of tantalum (inferred resource of 385 Mt Ta2O5,Tertiary Minerals plc, 2002). The deposit also contains a lot of Y, heavy REE, Zr, Th, U and Nb.
