Australian Rare Earths Limited (AR3) has discovered a new niobium-rare earth mineral system at its Overland project in South Australia. The discovery occurred during a drilling program originally focused on sedimentary-hosted uranium targets. Geochemical analysis and petrographic studies of drill cuttings from hole OV167 confirmed the presence of pyrochlore, the primary ore mineral for niobium, alongside significant rare earth element enrichment.

The company reported that drill hole OV167 intersected a 19-metre mineralised interval starting from 86 metres depth. Notably, the intersection returned 0.61% Total Rare Earth Oxides (TREO). Geological interpretation suggests this drill hole may have intercepted a peripheral sill or dyke, pointing toward a larger, untested carbonatite intrusive body located nearby.

"OV167 has delivered an exciting and unexpected technical result, the identification of a new niobium-rare earths carbonatite mineral system at Overland."

"While the Overland carbonatite discovery represents an exciting new exploration opportunity for AR3, our priority remains firmly on progressing the development of our flagship Koppamurra rare earths project."

— Travis Beinke, Managing Director and CEO

The discovery is supported by a large, coherent magnetic anomaly in the region, which the company identifies as a primary vector for future exploration. This anomaly is interpreted to reflect potential iron-titanium oxide accumulations associated with the carbonatite system.

To evaluate the significance of this system, the company has outlined a clear forward work program. This includes expanded geophysical modelling to refine the structural geometry of the R254 target area, alongside detailed petrographic assessments. The company is planning a targeted follow-up drilling campaign to test the extent of the mineralisation and determine if the system hosts shallow supergene-enriched zones. 

Read the full announcement: Niobium-Rare Earth Carbonatite System Identified at Overland