Alvo’s Bluebush footprint grows as heavy rare earth drilling advances

Bluebush footprint grows around Serra Dourada

Alvo Minerals (ASX:ALV) has spent the September quarter turning Bluebush into a larger and more defined heavy rare earth proposition, consolidating ground across the northern Serra Dourada granite in Brazil. The company acquired 100% of the 575-hectare EZX tenement for US$210,000 and added a 656-hectare Florence tenement through an earn-in agreement that could deliver an 85% interest.

The geology is the main attraction: Serra Dourada also hosts the Serra Verde ionic adsorption clay operation about 40 kilometres to the south. USA Rare Earth completed its approximately US$2.8 billion acquisition of Serra Verde during the quarter, alongside a 15-year, 100% offtake agreement with US government-backed floor pricing. That transaction provides a notable commercial reference point for the type of heavy rare earth exposure Alvo is pursuing, although it does not establish an economic value for Bluebush.

Reconnaissance drilling on EZX comprised 40 holes for 269 metres, with multiple portable XRF readings above 1,000ppm XREO. Those readings are qualitative and require laboratory confirmation, but they support Alvo’s interpretation that mineralisation at the Boa Vista prospect extends into the new ground. The expansion builds on the earlier 575-hectare EZX acquisition, which secured the tenement’s mineral rights for Alvo.

Surface assays strengthen Boa Vista case

Independent assays reported after quarter-end supplied the more investable part of the story. Selected Boa Vista results included 6 metres at 2,537ppm total rare earth oxide, including 3 metres at 3,415ppm, from surface in truck-mounted auger hole BLG0008. Diamond hole BLD002 returned 5 metres at 1,390ppm TREO from surface, including 2 metres at 2,040ppm and 123ppm dysprosium-terbium.

Across 162 significant intercepts, Alvo said dysprosium and terbium averaged about 26ppm on a weight-averaged basis, equivalent to approximately 14.2% of magnet rare earth oxide. The company has completed 448 holes for 3,708 metres across Bluebush, while 1,369 samples from 188 auger holes at Boa Vista and São Bento remained with SGS Geosol for independent assay as at the report date.

Those results remain an exploration dataset rather than a resource. True widths are not known for the reported intercepts, several auger holes ended in mineralisation, and a maiden mineral resource estimate still depends on further drilling, assays and geological interpretation. An EM survey at Boa Vista has now been calibrated against drilling and is being used to map deeper clay and guide infill work.

Florence drilling and metallurgy move next

At Florence, 22 holes had been completed by 27 October, reaching a maximum depth of 21.6 metres and averaging 10 metres across truck-mounted and handheld auger holes. Broad clay zones up to 20 metres thick were intercepted, with more drilling and soil sampling planned. The company also sent samples to ANSTO for magnesium sulphate diagnostic leaching and column tests, alongside permeability testing, to assess processing options including in situ recovery, vat leaching and heap leaching.

Alvo’s earlier desorption work had recorded average extraction of 56% across neodymium, praseodymium, dysprosium and terbium under the stated test conditions. The upcoming testwork matters because grade alone will not determine whether the clay can be processed economically or with the intended environmental characteristics.

Palma conductor creates a second drilling catalyst

Bluebush is not Alvo’s only active exploration thread. At the 100%-owned Palma copper-zinc VMS project, downhole electromagnetic work on hole PDT-132 identified an off-hole conductor modelled at 590 to 660 siemens, the strongest response recorded at the Touro prospect. The target sits near a hole that intersected disseminated and semi-massive sulphides, including a 10-metre mineralised interval containing 0.8 metres at 0.46% copper and 2.33% zinc.

The conductor is now the priority target for Phase 2 drilling, with an environmental licence covering roughly 500 metres of strike. That work follows the earlier 590 to 660 siemens Touro conductor, while weaker results at Esperanza and no significant intercepts at Entre Rios have narrowed the immediate focus.

Funding improves after a thin quarter-end balance

The balance sheet supplies the report’s sharpest caveat. Alvo ended September with A$227,000 in cash after using A$817,000 on operating activities and A$114,000 on tenements during the quarter. On the company’s reported calculation, that represented only 0.28 quarters of funding, before allowing for the post-quarter A$1 million placement and A$53,950 received from option exercises.

The company said the September quarter included some non-recurring capital expenses and that discretionary exploration spending could be reduced if necessary. The placement was made at a slight premium to the 15-day VWAP and is intended to support exploration, but the capital will need to cover an expanding programme across Bluebush and the planned Touro drilling. The immediate test is whether assays, metallurgical results and the path to a maiden resource arrive quickly enough to justify that broader campaign.