Lion Rock Minerals has reported high-grade, surface-starting rare earth mineralisation at Minta Est, including 4.54% TREO over 2.3 metres and a 21.15% TREO saprolite interval. The results add a second exploration stream to its expanding Cameroon rutile province, although the company’s A$4.55 million cash balance provides an estimated 2.1 quarters of funding at the latest burn rate.
- Up to 4.54% TREO over 2.3 metres from surface at Minta Est
- Saprolite interval returned 21.15% TREO and remains open at depth
- 761-hole, 3,485-metre Minta Est campaign completed
- Mboma-Loum rutile corridor spans 130 square kilometres
- A$4.55 million cash balance supports an estimated 2.1 quarters of funding
Minta Est rare earths emerge from beneath the sands
Lion Rock Minerals Limited (ASX:LRM) has turned Minta Est into a more consequential exploration story after laboratory work on retained auger material identified rare earth mineralisation starting at surface and continuing into saprolite. The strongest reported intercept ran 2.3 metres at 4.54% Total Rare Earth Oxides, or TREO, from surface, while a 0.3-metre saprolite interval in the same hole returned 21.15% TREO.
Two other surface intervals returned 3.0 metres at 3.40% TREO and 2.0 metres at 3.49% TREO. Each ended in mineralisation, meaning the shallow auger programme did not establish the bottom of the mineralised zones. The results came from a selected 90-result dataset generated through ICP-OES analysis of retained material, rather than from a resource estimate or a completed economic study.
The rare earth basket is magnet-rich, with neodymium and praseodymium representing about 21% to 24% of TREO in the leading intervals, while dysprosium and terbium contributed roughly 0.6% to 1.6%. Eight of 15 continuously assayed holes averaged more than 1% TREO across their full drilled lengths, although the dataset was targeted and the median TREO result across all 90 valid assays was 0.46%.
761-hole programme creates a large assay pipeline
The company completed 761 vertical auger holes over 3,485 metres across about 50 kilometres of rivers and tributaries at Minta Est, far exceeding the original 118-hole scope. The campaign generated 3,666 samples, with results to be released in batches as independent laboratories process heavy-mineral and whole-sample streams. Earlier reporting from the programme had already identified repeated shallow monazite-bearing heavy-mineral zones in the first 69 Minta Est holes.
Subsequent to quarter end, results from 167 holes showed TREO of up to 3.04% and calculated monazite of up to 5.69% in recovered heavy-mineral concentrate. Those figures are not directly comparable with the in-situ TREO grades from the retained drill material: one set describes concentrate or calculated values, while the other measures whole drill intervals. Batch 33 test work also returned 2.671% TREO in a separated middlings stream, but Lion Rock said the available magnetic fraction was too small to calculate a complete recovery or upgrading factor.
Rutile province adds scale and commodity breadth
Rare earths are not replacing the rutile story. Lion Rock says drilling and mineralogy have defined a 130-square-kilometre Mboma-Loum residual rutile corridor, with peak results of 72.7% rutile in heavy mineral and 3.32% in-situ rutile. A neighbouring Minta 1 tenement supplied a third high-grade rutile discovery, including 66.3% rutile in heavy mineral and 1.74% in-situ rutile, while a second accredited laboratory confirmed natural rutile nuggets grading up to 98.4% TiO2.
The company’s technical work now spans two distinct questions: whether the shallow rutile occurrences can support a coherent mineral sands opportunity, and whether Minta Est’s monazite-hosted rare earths extend beyond the depth reached by the augers. Lion Rock has engaged specialist consultants and plans diamond drilling, alongside XRF, XRD and QEMSCAN work to identify the mineral hosts, liberation characteristics and potential product streams. Its 80% interest in the Cameroon tenements remains unchanged.
Cash runway puts a timetable around exploration
Lion Rock spent A$1.43 million on exploration and project activities during the September quarter, with total net cash used across operating, investing and financing activities of A$2.30 million. Cash and cash equivalents fell from A$6.865 million to A$4.551 million, leaving the company’s Appendix 5B estimate at 2.1 quarters of available funding based on the reported net operating outflow.
That balance is not an immediate funding shortfall under the company’s filing, but it does place the next phase of drilling, assays and metallurgical work against a relatively short financial clock. The exploration case is gaining geological detail; the harder test will be whether diamond drilling, recoveries and product qualification can convert promising grades into a defined development pathway before the result pipeline demands another funding decision.
Bottom Line?
The next value test is not another headline grade but evidence that Minta Est has depth, continuity and recoverable products before the current cash runway narrows further.
Questions in the middle?
- Will diamond drilling show that the high-grade saprolite mineralisation continues below the auger limit?
- Can the remaining Minta Est batches establish continuity and scale across the broader monazite-enriched system?
- Will Lion Rock need additional capital before it completes the drilling, recovery and product-qualification work now planned?