Ilmenite mine was developed in the anorthosites which intruded Precambrian Jirisan gneiss complex in Wolheongri, Okjong-myeon, Hadong. Ti-ore bodies are confined to the intercumulated type anorthosites, where REE-bearing allanite occurred as veins. The chemistry of allanites shows relatively low in CaO (11.02∼12.81 wt%), but high in ∑R2O3 (R = Ce, La, Nd) (17.21∼21.58 wt%), respectively. Abnormally high radioactive detection ascribes to the presence of small particles of thorium mineral known as thorite (ThSiO4). Thorite shows 65∼72.78 wt% (ThO2) and 5.49∼12.78 wt% (UO2) in composition. The radioactive prospecting could be a strong tool to find REE-bearing allanite which is closely associated with Ti-ore deposits.
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