Terrain Minerals Drills Deeper into Rare Earths Potential at Lort River

Terrain Minerals has kicked off a new air-core drilling program at its Lort River rare earths project in Western Australia, seeking to follow up a previously reported high-grade intersection that hinted at the presence of a potentially significant clay-hosted rare earth system.

The program targets a broad regolith basin identified through airborne electromagnetic surveying and prior drilling. Early geological interpretation suggests the basin could host widespread rare earth element (REE) mineralisation - a deposit style that has attracted intense investor interest given its potential for relatively low-cost extraction and strong demand from the magnet metals sector.

The Lort River project is located about 50 kilometres northwest of Esperance within the Albany-Fraser belt, a region increasingly recognised as prospective for clay-hosted rare earth deposits.

Chasing scale after standout intersection

The current campaign is designed to step out from a previously drilled hole that returned a notable intersection of 8 metres grading 4,037 parts per million total rare earth oxides (TREO) from 23 metres depth.

Within that interval were higher-grade zones including:

• 1 metre at 9,842 ppm TREO

• 1 metre at 9,022 ppm TREO

These grades are particularly compelling given the shallow depth and the clay-hosted geological setting. Importantly, the mineralisation includes magnet rare earth elements such as neodymium, praseodymium and dysprosium - the metals critical for high-performance permanent magnets used in electric vehicles, wind turbines and defence technologies.

The standout hole also recorded strong magnet metal content, including:

• 2,362 ppm neodymium

• 647 ppm praseodymium

• 291 ppm dysprosium

Such ratios are closely watched by investors because magnet metals typically command higher market values and are the primary drivers of demand in the rare earth supply chain.

A large clay basin emerging

One of the most intriguing aspects of the exploration story is the potential scale of the target.

Geophysical modelling indicates the interpreted regolith basin stretches more than 12 kilometres in length and around 5.5 kilometres in width, covering roughly 66 square kilometres.

Airborne electromagnetic data highlights conductive zones within the basin that correspond with weathered clay horizons capable of concentrating rare earth elements. The histogram depth modelling presented by the company shows broad areas where regolith development may be sufficiently thick to host mineralisation.

This is exactly the geological environment that has underpinned several recent clay-hosted REE discoveries across Australia and Brazil.

If consistent mineralisation is confirmed across even a portion of the basin, the project could develop into a sizeable rare earth exploration play.

Drilling program designed for rapid targeting

The current program is relatively modest in scale - around 1,500 metres of air-core drilling - but it is strategically positioned to test several priority zones near the earlier discovery hole.

Terrain executive director Justin Virgin says the work is focused on assessing both grade continuity and the broader footprint of the mineralised system.

“This step-out program is designed to test priority zones near the high-grade intersection, which sits within the 66 km² regolith zone identified via airborne electromagnetics,” Virgin said.

“Multiple areas will be tested as we assess the broader zone for scale and consistency of grade.”

Samples will initially be collected in three-metre composites before laboratory analysis.

Timing has also played a role in the scheduling of the campaign. According to Virgin, March represents the final window before cropping activity restricts access to parts of the farmland hosting the project area.

Rare earths remain a secondary focus - for now

Interestingly, despite the encouraging early signs at Lort River, Terrain’s near-term corporate focus remains on its Smokebush gold and silver project in Western Australia.

The board opted to run the REE drilling campaign after completing reverse circulation and diamond drilling at the Lightning and Wildflower targets within Smokebush.

Nevertheless, the company clearly sees strategic value in the rare earths opportunity.

“Early data interpretation has confirmed a broad conductive regolith clay basin at our Lort River Project that correlates with potential REE enrichment,” Virgin said.

“These results, combined with our previous geochemical work, reinforce the potential for the Lort River Project to represent a unique emerging critical minerals discovery opportunity within the Esperance region.”

Early-stage, but an interesting critical minerals angle

For investors, Lort River remains firmly in the early exploration stage. No new assay results have been reported from the latest drilling campaign yet, meaning the current program is largely about testing the geological model and expanding on earlier intercepts.

However, the ingredients of a potentially interesting REE play are present: shallow mineralisation, favourable clay-hosted geology, encouraging magnet metal ratios and a large target area.

If further drilling confirms continuity across the basin, Terrain could add a new critical minerals dimension to its broader exploration portfolio - one that sits alongside its gold, gallium and lithium projects across Western Australia and Queensland.

For now, the next catalyst will be the results from the current air-core program, which should provide the first real indication of whether the Lort River basin can deliver scale as well as grade.