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Location: 25 km S from Dubbo, New South Wales, Australia
Level 4, 66 Kings Park RoadPO Box 768 (PC 6872)PerthWestern Australia, Australia6005
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The Toongi deposit is centred on a trachyte outcrop that forms one of several alkaline volcanic and intrusive bodies of the Jurassic age in the region (formed 190 - 210 million years ago). The elliptical-shaped body has approximate dimensions of 850 m east-west by 550 m north-south. The deposit forms a low irregular topographic rise and has an average depth extent of 115 m below the surface. The Toongi deposit is predominantly a massive, fine-grained microporphyritic trachyte with more than 80% of the deposit consisting of feldspar, albite and aegirine (in roughly equal amounts). The rest of the rock is made up of opaque minerals. Extensive mineralogical studies have indicated that the minerals contained in the deposit are extremely fine-grained, being less than 100 µm in size (and generally less than 10 µm), and uniformly distributed throughout the rock mass. The bulk of the metals are hosted in complex Na–Ca–Zr–Hf–HREE silicate phases (eudialyte like mineral). The dominant niobium (and tantalum) mineral is close to NaNbO3 (natroniobite) in composition. Separately bastnasite hosts the light rare earth metals. The deposit contains elevated levels of the metals zirconium (Zr), hafnium (Hf), niobium (Nb), tantalum (Ta), yttrium (Y) and rare earth elements (REEs) – lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu). Refer to Appendix 1 for further detail of the grades in the Measured Resource Estimate. The orebody also holds some uranium and thorium and is classified as weakly radioactive.
